How to tighten the timing belt of a VAZ 2115

Why check the timing belt

The operating time of the timing belt in modern cars ranges from 50,000 to 100,000 km. When this mark is passed, a new belt has to be installed, as well as tension rollers, pump and pulleys.

The timing of replacement is precisely regulated in the vehicle instructions by each manufacturer. But you should not rely entirely on official instructions, since in reality the part may wear out earlier than expected. Auto mechanics recommend checking the part every 40,000-45,000 km.

The timing belt is an element that synchronizes the operation of the pistons and the ignition system. It is tensioned on the pulleys of 2 shafts - the camshaft and the crankshaft. At the same time, the water pump is activated. Using a special roller, the toothed belt made of rubber and nylon is given the necessary tension.

If you do not monitor the technical condition of the belt in advance, it will break. This will cause the intake and exhaust valves to collide with the pistons. This is a breakdown that will require expensive repairs.

Cracks on a worn timing belt

Why and how to check chain tension

Correctly tensioning the chain means avoiding breakdowns of the chain itself or other troubles associated with this element.

Multi speed bike

The chain tension on multi-speed bicycles depends entirely on the spring element on the rear derailleur. But such a condition does not exclude constant checking of its tension. Otherwise, with strong tension, the switching process will be difficult and, as a result, the condition of the sprocket teeth and the chain itself can be damaged. If the tension is weak, it will constantly hit the frame stay, which will lead to wear of the entire transmission and a dirty stay.

There are two ways to measure bicycle chain tension:

We install the chain on the front and rear large sprockets. At the bottom of the front sprocket, the links are pulled forward, towards the front wheel, until the gear selector on the rear wheel is stationary. The circuit from the switch should have a straight line. If at this tension there are 2 extra links left, then the chain length corresponds to the required one.
We install the bicycle chain in a position where the tensioner roller and the guide roller on the rear wheel of the derailleur will be perpendicular to the ground and on the same line. That is, the chain on the rear derailleur is installed on a small sprocket, and on the front on a large one.

Before adjusting the tension on a dual-suspension bike (a bicycle with two shock absorbers), check as follows. Press down on the bike (pendulum) until the front sprocket drops to the maximum distance from the cassette. This gap is an indicator for measuring the required chain length.

Singlespeed bicycle

Singlespeed is a bicycle without speeds. It has only two stars, one star each at the front and back. Bicycle models in which it is not possible to adjust the gears, that is, select the speed value on the switch. And also bicycles with a planetary hub, which is similar to a gearbox in a car and can change speeds using a mechanism built into the hub. But what these options have in common is that you can tighten the chain by shifting the axis of the rear hub.

What are the consequences for a bicycle without speeds? With strong tension, the load on both the carriage bearings, bushings, sprocket teeth, and the bicycle chain itself increases. And this will lead to increased wear of the listed elements and to their rapid failure. And if the tension is weak, the chain can fly off the sprockets while driving.

Regardless of whether there is one front sprocket or two, or a planetary hub is installed, you can check how well the chain is tensioned in the same way. Having installed the bicycle so that it does not swing, you need to use your finger to pull the lower part of the bicycle chain down until it stops. The distance when tensioning should not exceed 1-1.5 cm. Please note that you should not overtighten. The movement of the chain when pulling is less than 0.5 cm, then the tension needs to be loosened.

How to check the timing belt. Self-test steps

Access to the unit is difficult - the belt is hidden behind different covers. For inspection, it is often necessary to partially disassemble the engine. Next, in addition to the belt itself, it is important to check the rollers. If they jam, the belt will break again.

The step-by-step process for checking the timing belt looks like this:

removing the engine protection and plastic screen for access to the crankshaft, camshaft, belt, rollers, pump;
unscrewing the bolts from the protection and removing it;
inspection of the element - it is necessary to check the timing belt on both sides for cracks and other damage;
checking the belt tension - the crankshaft must be turned 1-2 turns in different directions, then turn the belt between the camshaft and the crankshaft with the teeth towards you; a sign of normal tension is a rotation angle of 90 degrees.

The tension can be easily adjusted by changing the position of the tension roller. If abrasions, scratches or cracks are found, the belt should be replaced to avoid serious damage.

Checking the timing belt tension

In what cases is it worth replacing the belt? Signs that it is time to change the timing drive.

VAZ "Ten"

Replacing the timing belt and tension pulley is one of the most important procedures included in vehicle maintenance. This process is quite simple and usually does not take more than half an hour (if you know how to check the timing belt), but failure to do it in a timely manner can lead to much more serious problems and costs.

Checking the timing belt is an even simpler process than replacing it. Its “well-being” is assessed visually, so first you will need to remove the plastic engine screen, and then the protection covering the pulleys of the pump, crankshaft and camshaft, the tension roller and the belt itself. The protection is held on by three 10mm bolts, which are most conveniently removed using the appropriate socket.

Once you have a view of the belt, you need to carefully inspect it for scuffs, scratches, cracks and other damage, both on the outside and on the inside - there should be none. Otherwise, immediate replacement is necessary.

If everything is in order, we move on to checking the timing belt tension. To do this, you must first turn the crankshaft 1-2 turns clockwise, and then a little in the opposite direction.

Then, using little force, we try to turn the belt in the area between the crankshaft and camshaft pulleys, with the teeth facing outward. If the belt rotates 90 degrees, everything is fine.

In general, checking the timing belt is a completely simple procedure, but there is one caveat. At the heart of the belt is a cord - a weave of very strong fiberglass threads.

So, unfortunately, there is no way to check the condition of these threads (if the cord threads are visible, this means that the belt should have been changed yesterday). In the case of a high-quality product, you don’t have to worry about cord breaks.

However, it also happens that an apparently almost new timing belt still breaks. The reason for this is the low quality of the cord material.

Typically, the tension pulley fails much less frequently than the timing belt, but this is only true for high-quality parts. Therefore, it would not be amiss to inspect it too. There should be no chips, cracks or other damage on the surface.

Ideally, the roller should be removed and rotated in any direction, holding it by the central part. The rotation must be smooth, no jamming or extraneous noise is allowed.

If the roller passes the test, it can be returned, not forgetting to correctly align and tension the belt.

What signs indicate a timing belt replacement: 6 signs

Visually visible cracks and tears are not the only signs of possible failure. There are a number of other symptoms:

Age. The service life of the part is determined by the mileage of the vehicle. But the age of the part also matters. If the car has been sitting idle for a long time and has not accumulated mileage, the belt still loses its original properties of strength and elasticity. On average, after 5 years, the part becomes covered with cracks, regardless of the number of kilometers traveled.
Loss of power or uncertain starting of the internal combustion engine. A worn or weakly tensioned timing belt can jump over several teeth on the pulley. In this case, the function of the ignition system is disrupted - the fuel mixture ignites earlier or later than the specified time. At the same time, the driver feels that there are gaps in the traction, the internal combustion engine starts up uncertainly, and vibrations occur.
Black smoke. If the timing belt is faulty, the mixture in the engine does not burn completely, which leads to destruction or melting of the catalyst. In this case, a portion of unused fuel penetrates into the exhaust system, resulting in the permissible temperature being exceeded. An obvious symptom of this situation is that the exhaust is accompanied by popping sounds, and the color of the smoke from the chimney is black.
Extraneous sounds in the engine. If the timing belt is cracked or frayed, you can hear characteristic ticking, clicking and other sounds from under the unit casing. Typically, the frequency of sounds increases with increasing engine speed.
Leaks in the drive. If oil or coolant is leaking, there is obviously a problem with the gas distribution mechanism. When the crankshaft oil seal wears out, some of the lubricant gets onto the belt. If the joints have lost their tightness, the belt is coated with antifreeze. As a result, the assembly deteriorates faster and jumps over the teeth of the pulleys.
Starter idling. If, when idling, the combustible mixture is not picked up and ignited in the cylinders, then there is no compression. This indicates mechanical damage to the valves, which are bent when meeting the pistons. This is the worst consequence of a broken timing belt. You will have to change the engine or send it for an expensive restoration.

How to choose a film?

To choose a high-quality covering material, you need to pay attention to the following points:

strength and durability;
light transmittance;
price according to quality.

There are such types of film:

polyethylene - the most popular, it can be 15-300 microns thick and 3-6 m wide, the optimal thickness is 150-200 microns, removable for the winter;
reinforced - allows you to use the structure for three years without disassembling it for the winter, optimal density is 150–200 g/m², the reinforcement is polyethylene or polypropylene;
PVC - differs from others in its yellowish edge, does not allow sunlight to pass through during the day, and retains heat well at night, not suitable for use at –15°C and below;
stabilized - usually colored, but there is also transparent, resistant to the destructive effects of the sun, lasts 2-3 years, thickness 80,100, 120, 150 microns;
light-scattering - capable of reflecting heat and absorbing ultraviolet radiation, which protects the crop from burns, not suitable for use in partial shade;
infrared - designed more for heating, mounted in the base and runs on a 200 W network;
frost-resistant - can last up to 7 years, impact-resistant, withstands hail, does not crack.

Important! For private use, the first three varieties are usually used, since they optimally combine price and quality.

How to check the timing belt tension on domestic “ten” and foreign cars

Tensioning the timing belt
On many modern internal combustion engines, the timing belt is tensioned automatically; the mechanic only needs to fix the position of the tensioner roller. But there are also quite a few power plants where the belt is tensioned with manual checking. As a rule, the hands of an experienced craftsman cope with this task with a bang. It will be much more difficult for a beginner to do this. In this article we will try to provide recommendations and advice that will greatly facilitate the task of diagnosing the tension of the timing rubber ring.

VAZ "Ten"

A popular car equipped with an engine with a timing belt drive. The manufacturer recommends replacing the rubber band of the GRS mechanism after 40-45 thousand kilometers, but diagnostics cannot be neglected before this period. The principle of “installing a new belt and forgetting about it” must be eradicated, understanding that being guided by this rule will not lead to anything good.

Attention. It is very important to regularly diagnose the technical condition of the belt and its tension.

In order to check the tension today, special electronic devices are used, although you can do without them. Only on the timing rubber product itself there should not be a drop of oil, dirt or signs of tear. Everything must be almost perfectly clean, without delamination, for the diagnosis to be most effective. Otherwise, it is better not to bother with diagnostics, but to immediately replace the belt with a new one, eliminating the reason why it was worn out or lubricant got on it.

Checking tension with a steelyard

Another important condition: the check must be carried out on a cold internal combustion engine.

The checking and adjustment process itself is as follows:

The scales are fixed by the handle of the key. You can attach them with electrical tape to the socket wrench so that the hook of the scale is not at the bottom, but on top of the wrench. In other words, you need to do everything so that the measurement is carried out when pressing.
Now you should remove the front belt protection cover.
The front wheel of the V8 will have to be jacked up, and then the right mudguard of the engine compartment will have to be removed.
Using a 17M wrench, turn the crankshaft by the bolt and carefully inspect the belt for defects.

Volkswagen

As you know, Volkswagen cars are equipped with timing belts and chains. According to the service book, the belt tension should be carried out so that one branch of the belt can be rotated 90*, as is the case with the Audi. Only here a few questions arise.

Timing belt tension on Volkswagen Passat

For example, one of them concerns the rotation force of the belt. Some people have strong fingers, others have weak ones. For this reason, it is recommended to carry out a combined tension and take the average value. More details below:

Do not tension the belt too much, and in this case, when the engine is accelerating, the belt will slam noticeably.
Pull the belt tightly, and then the belt, together with the tensioner roller and the pump, will make a characteristic unpleasant sound.

You should push off from the golden mean, when the belt does not clap or make noise.

On Kia cars, you first need to figure out where the belt is. Depending on the specific Kia model, the belt may be shaped like a semicircle or come out as a tensioner bolt.

Other important recommendations:

The mark on the crankshaft pulley must match the mark on the cylinder head cover.
When adjusting the tension, be sure to use the correct size wrench.

Tension is carried out by turning the bolt with a wrench in the opposite direction. If the tension is incorrect, the internal combustion engine will not function properly. And if it starts to whistle and make unusual noise, this is a clear indication of insufficient tension.

How to tension the timing belt?

If the reel belt is not worn or torn, but only loose, you can easily tighten it. The procedure is quite simple and you do not need special tools or a mechanic. Of course, if you have absolutely no idea what a timing belt is and where it is located, the best solution would be not to try yourself as a master, but to leave the belt tension to professionals.

So how do you tighten your timing belt - step by step?

Place the car in a level, comfortable place and make sure the engine is turned off
Wear work clothes and gloves (and glasses will come in handy)
Disconnect the battery - When working in the engine compartment of a vehicle, always disconnect the battery before starting work. This will give you confidence that the engine will not start and cause you harm. You can disconnect the battery using a wrench and simply loosen the nut that secures the ground cable to the negative terminal of the battery. (Do not disconnect the positive terminal, only the negative one)
Find out where the belt is and whether there is only one belt or several. If you're not sure exactly where the belt is, or you don't know where to look for it, or your vehicle has more than one belt, consult your vehicle's owner's manual.
Measure the belt tension - you can do this step by taking a ruler and placing it on the guide. To get the most accurate result

To find out what the measurements show and whether the belt tension is normal or stretched, you should consult your vehicle's owner's manual, as each manufacturer has its own specifications for determining the tolerance. However, it is good to know that in general all manufacturers recognize that a deviation of more than ½ inch (13 mm) is not within the norm.

You can also measure belt tension in two other ways. For the first, you will need a special testing device, which you can buy at almost any store selling auto parts, accessories and consumables.

The second method is an alternative to the straightedge method, and to measure the tension, simply turn the belt, and if you notice that it is curling, this is a clear sign that it is loose and needs to be tightened. This method isn't the most accurate, but we've shared it in case you find yourself in a situation where you don't have the ability to take precise measurements, but need to check the condition of the guide belt and tighten or replace it if necessary.

Check the condition of the timing belt - make sure the overall condition of the belt is good before you start tightening it. Inspect it carefully for oil, wear, breaks, etc. If you notice such things, there is no point in tightening the belt, as it needs to be replaced immediately. If everything is good, then you can move on to the next step. Tension the belt - to do this you need to find the bolt that holds it. It may be located in different locations depending on your vehicle model, so again refer to your vehicle make and model manual.

However, it is usually located on the alternator and is bolted to one side, leaving the other side free so that it can rotate and allow the belt to be tightened or loosened. If you find a bolt, loosen it slightly with an appropriate wrench so you can work easily and quickly restore track tension. Once the belt has moved to the desired position, tighten the adjustment bolt to secure the belt in place.

After tightening the adjustment bolt, check the belt tension again to ensure it is securely tightened. To check, use the same test with a ruler, or you can buy special tests from specialized stores and services that make the measurement extremely quick and easy.

Do the final checks - start the car and see how the belt “behaves” in motion. If you hear the squeaking or knocking noise again, the track belt needs some tension. However, if you hear a "pulsating" sound from the alternator, this is an indication that you have tightened the belt too much. To fix everything, you just need to repeat the previous steps again. For a final test, you can turn on all the engine accessories at the same time, and if you notice that any of them are not working properly, repeat the belt tensioning steps again. If everything went well, you managed to tighten the timing belt!

As we said at the beginning, tensioning a track belt is not a difficult task, and if you have the will, a little time and basic tools (a set of wrenches and a ruler or a track belt clearance test), you can do it yourself.

But what to do if it turns out that the belt not only sags, but also wears out, “polishes” or breaks? If during inspection of the belt you notice that it is worn, you should replace it with a new one as the tension will not work. Replacing the track belt also does not require any special training or special tools.

What you will definitely need is a machine manual, a belt routing diagram, and of course a new belt (or belts). The replacement procedure itself requires you to locate the track belt, disconnect it from the rollers it is attached to, and then install the new belt in the same manner.

Timing belt tension: algorithm of actions

The timing belt is an element in the engine design that connects the camshaft and crankshaft, organizing the timely opening and similar closing of the valves. The belt drive must always be well tensioned; as a result, engineers have introduced special tensioners into the design of the gas distribution mechanism. Few people know, but not only the service life of the belt itself, but also the unit as a whole depends on proper tension settings. We will talk in more detail about how to tighten the timing belt, and when such an operation may be required, in the article given today.

How to tension nylon strings

In order to correctly answer the question of how to string nylon strings on a guitar, you first need to understand the characteristics of the material. The most important thing you have to learn is that nylon is much lighter and softer than the standard metal for regular strings. It stretches very strongly, and in fact, classical musicians begin any set of lessons with tuning, so you should be prepared for this.

An important distinctive feature of classical guitars and strings for them is the fact that they do not have special fasteners for fixing to the tailpiece on the soundboard. And the tailpiece itself does not have pins, leaving you with only holes in the plastic part. So you have to learn the art of creating the right locking knots that are easy to make and that won’t slip out under tension.

First, thread the string through the hole, make a knot, wrap it around itself several times, and then pull it tightly so that the turns are locked in the correct position. Then place the string on the nut on the fingerboard, insert it into the peg, make 3 or 4 turns, and bend the rest of the string inward at a 90 degree angle. Repeat the procedure with all the strings from the thickest to the thinnest and then begin to gradually tighten them to achieve the correct sound.

Be prepared for the fact that after the tightening, repeat ones will have to be done at least 3-5 times at intervals of 30-60 minutes. Only after this, the guitar will be ready to play. However, in the process, the strings will continue to stretch. How often the strings for a classical guitar will need to be tightened is directly affected by their quality and the reliability of the tuning mechanism.

Now you know how to string a classical guitar, as well as a regular acoustic guitar. However, we, of course, could not talk about all types of instruments, and in some cases, the installation of strings is associated with the design features of the tailpieces. However, now you can approach the process intelligently and perform it really quickly, competently and safely both for yourself and for your instrument, the care of which will definitely return to you with excellent sound and reliability in any situation.

A few words about the importance of correct tension

Many motorists know that improper functioning of the timing belt can cause very serious engine damage. This is due to the principles of operation of the mechanism, which boil down to the timely and high-quality opening/closing of the engine valves. This approach not only allows you to adjust the valve timing of the internal combustion engine, but also differentiates between sensitive valves and constantly knocking pistons.

If the timing belt begins to work incorrectly, the gas distribution order is disrupted, as a result of which engine elements begin to wear out at an accelerated rate. Similar disturbances in the functioning of the engine can also occur due to improper belt tension.

Note! A break in the belt drive while driving not only negatively affects the condition of the engine, but can actually severely bend the valves. Repairing a car with such a breakdown often costs motorists five-digit sums of money.

In addition, drive tension that does not meet the standards accelerates wear of the main timing elements, the list of which includes:

directly the belt drive itself;
rollers;
torque clutches;
guides;
tensioner

Types of spokes and causes of problems

Spokes are structural parts of a bicycle wheel that connect the hub and rim. These elements serve to lighten the structure without losing strength. They are made from stainless, chrome or carbon steel, carbon fiber, aluminum, titanium. There are several types of products:

by caliber - 1.5, 1.6, 1.8, 2.0, 2.34 mm;
by type of head - straight and curved;
by design type - cylindrical with butting and aero spokes.

Butting is a reduction in the middle part of the spoke, which bears light loads. Used to reduce the mass of an element.

Straight knitting needles

Bent
Wheels experience stress from the moment the user takes his seat. Driving on poor road surfaces, bumps, and potholes negatively affects their condition. Beginning athletes often distribute weight incorrectly, which increases the wear rate of the structure. Jumping, sudden braking and other extreme stunts lead to deformations, which can only be dealt with by adjusting the spokes on the bicycle. The following problems usually occur:

lateral curvatures – figure eights;
radial deformations – ellipses;
lack of centering of the rim in relation to the bushing - umbrella.

To eliminate damage, the spokes are loosened or tensioned. It must be remembered that the elements located on the right side, when tightened, shift the rim to the right, and those on the left - to the left. This point must be taken into account when setting up.

When using a bicycle, the spokes on the wheel can stretch, which leads to a loss of rigidity in the connection between the rim and the hub.

Eight

Ellipse

When does the belt need to be tightened?

Having considered the previous paragraph of the article, it was probably not difficult to understand that monitoring the correct functioning of the timing belt is quite important. In particular, it is worth keeping the belt drive tension at the proper level. By the way, stretching is carried out only in two main cases:

During a routine check of the gas distribution mechanism and the tension does not comply with the norm. The normal tension of the timing belt is checked in a very simple way, for which you will need ordinary spring scales and a ruler or caliper. To check, the hook of the scale clings to the belt and pulls until the display shows a load of 10 kilograms. Without loosening your grip, all that remains is to measure the deviation of the drive from the normal position. If the belt has been pulled back by more than 5.5 millimeters, but its tension is inevitable. Otherwise, you can leave everything as is until the next timing check, which is recommended every 10-15,000 kilometers;
When repairing the timing belt, when the belt was removed or its tension was weakened.

In situations that do not correspond to those noted above, it is simply not worth touching the belt drive of the mechanism. Especially if the motor runs stably, without pronounced problems.

What to do if the chain on your mountain bike is slack?

If you encounter the problem of chain sagging on a mountain bike or any other bike that has several gears, then in such a situation it should be changed. The fact is that in such bicycles the machine is responsible for tensioning the chain. Using a spring, it constantly and automatically adjusts the tension at which the chain mechanism should be.

Mountain bike machine To save money, some craftsmen “cut” the chain, that is, they cut it and reduce the number of links. In this case, the links are connected with a special lock. This option is, of course, also possible, but it is important to understand that a stretched chain is a worn-out mechanism and will not last long. When purchasing new chains, it is important to know that they come in different sizes and may not fit your trusty two-wheeled friend. First of all, you need to make sure what chain pitch is used on your bike model. You also need to decide on its length, which is usually measured in the number of links.

Stretching procedure

Let's say the timing belt on your car is literally slipping, or its tension is slightly off from the norm. What to do? Naturally, tighten the drive. Fortunately for many motorists, the tightening procedure is not so complicated and is completed within 5-10 minutes. To carry it out you will need the following tools:

a timing belt adjustment key, the design of which is quite simple, so it is not necessary to buy it, but can be made with your own hands;
basic set of wrenches.

The actual tensioning procedure goes like this:

First of all, we park the car in a place convenient for repair and disconnect the battery (just disconnect the negative terminal);
Then we tear off the hood and remove the protection from the timing belt, of course, if there is one;
After this, loosen the nut securing the tension roller;
Next, using a special key to adjust the belt tension, we tighten it. To do this, we insert the “horns” of the key into special holes on the adjusting nut, which is located in the area of the previously loosened fastening of the tension roller. Adjusting the belt tension is carried out by twisting a special key counterclockwise;
Having tensioned the drive as required, fix the tension roller in a stationary position and tighten its fastening;
Recheck the belt tension. If something is wrong, we fix it;
Otherwise, we bring the car back to its original condition, after which the repair can be completed.

Note! During repair work, you need to act carefully, without damaging adjacent timing elements. Often, the carelessness of inexperienced car repair workers complicates their lives by requiring additional repairs.

Perhaps this is where the most important information on timing belt tensioning has come to an end. We hope that the material presented today was useful to you and provided answers to your questions. Good luck in operating and maintaining your car!

Features of chain tension on a bicycle without gears

When working with a regular bicycle, remember not to tighten the structure too tightly. Normally, the value is allowed no more than 5 mm.

Chain tension sequence:

The bicycle should be turned over and a soft cloth placed under the seat to avoid damage.
The rear wheel is attached with two nuts. They should be loosened for comfortable installation of the chain.
The wheel is moved along inclined grooves to adjust the required level of sag.
After adjustment, the rear wheel is attached back to the nuts, tightening tightly. There is no need to make great efforts to avoid damaging the elements.
The mechanism must allow the pedals to rotate freely. That is why, after installation, you should check the bike in operation. Also, after completing the work, it is necessary to ensure that the wheel axis is parallel to the carriage.

Timing belt - checking the tension and replacing the timing belt

The timing belt is replaced every 60,000 km. mileage, in addition, the belt must be checked periodically (every 15,000 km) and if cracks, delaminations, deformations, defects, or traces of oil are found on it, then the belt is replaced. If traces of oil are found on the belt, the cause of the oiling must be immediately eliminated. (most likely this is due to the crankshaft and camshaft seals). A timing belt break, wear or shearing of its teeth can lead to engine damage and costly repairs.

Gas distribution mechanism: 1 – crankshaft toothed pulley; 2 – timing belt; 3 – tensioner roller; 4 – toothed pulley of the camshaft driving the exhaust valves; 5 – toothed pulley of the camshaft driving the intake valves; 6 – support roller; 7 – coolant pump toothed pulley

Why does the belt need to be tensioned?

Because it operates under high voltage, over time the tire that makes up the belt begins to relax and stretch slightly. And when it stretches, problems begin with engine components, because without belt drive they cannot perform their functions.

A loose coil belt can not only jeopardize the performance of engine components, but it can also cause internal damage to the engine itself, and then you will have to completely rebuild your car's engine or, worse, buy a new vehicle.

How can you tell if a track belt is stretched?

Look at the warning light on your car's dashboard - most modern cars have a warning light that shows the battery voltage when you start the engine. If the belt is not tight, it will not be able to rotate the alternator pulley, causing a drop in electrical current to the car's engine, which in turn will cause the warning light on the dashboard to turn on. Attention! The light may be on not because of belt tension, but because of problems with the battery or alternator.

Pay attention to engine temperature - if the timing belt is too tight, it may not supply enough water to the water pump and this will cause the engine temperature to rise, which will not be able to cool effectively. Listen for unusual noises or squeaks in the engine area - Squeaks are one of the first signs that the belt is loose, and if you hear them when you start the car when the engine is cold, or hear them when accelerating, then it's time to think about tightening the belt.

How to check the timing belt

To check the timing belt, unscrew the upper belt cover, which is held on by 6 bolts, and remove it
1 - two bolts ("16"), 2 - three bolts ("13"), 3 - one bolt ("8 ")
Once the cover is removed, the belt will become visible. We take a wrench with a 18-mm head and begin to turn the crankshaft pulley (by its bolt) and gradually inspect the belt along its entire length, section by section, for defects. .

To accurately check the timing belt tension, services use a special device. To approximately determine the belt tension yourself, you need to take the belt with two fingers and try to twist it around its axis (see figure). If you manage to twist the belt by more than 70°, it needs to be tightened.

To tighten the timing belt, you need to unscrew two screws and remove the bottom cover.

On the timing belt tension roller, loosen the nut with a regular wrench. We take a special key for tightening the belt (you can buy such a key for VAZs in spare parts - it fits) and rotate it counterclockwise, thereby tightening the belt. Pull up the roller and tighten its loose nut.

Now we check the belt tension as described above, after first turning the crankshaft pulley a few turns by grabbing its bolt.

Replacing the timing belt

Remove the engine guard, accessory drive belt, both timing belt covers, and crankshaft pulley (locking the flywheel with a screwdriver to release it).

The red arrow marks where you need to insert a screwdriver to block the flywheel for loosening and removing the pulley

Remove the plug from hole 2 for the TDC pin (it is located on the block near the first cylinder)

Now set the 1st piston to the TDC position. Screw in the crankshaft pulley bolt with a bushing (or several washers).

Turn the crankshaft clockwise so that the camshaft pulley stops at its triangular mark 1, in the middle of mark 2 located on the cylinder head cover.

Now insert the TDC mounting pin into the hole. If necessary, rotate the crankshaft clockwise and insert the TDC pin until the crankshaft is completely locked.

Note. The special mounting pin can be replaced with a regular M10 bolt, the thread length of which must be at least 75 mm. If the thread is longer, shorten it by screwing nuts and washers onto the bolt.

After screwing in the installation pin, the crankshaft cannot be turned clockwise.

Unscrew the nut securing the tension roller 7 Remove the timing belt and tension roller.

How to install a chain on a chainsaw?

The chain can be installed and tensioned by unscrewing the main screw and placing the links on the drive sprocket and guide bar. It is important to ensure that the tails fit into the groove so that they do not fly off again.

Before you tighten the Husqvarna chainsaw chain, you should look at its condition and, if necessary, replace it with another one. After removing this part, you need to carefully inspect the guide groove along which the links go. This is where dirt accumulates, absorbing oil and preventing tension on the cutting part. This place is cleaned using a thin metal object. If such actions are not performed, the oil may not reach the lower part of the bar, and after installing the chain, the links will slide worse, which affects sawing efficiency.

Why check the timing belt

The operating time of the timing belt in modern cars ranges from 50,000 to 100,000 km. When this mark is passed, a new belt has to be installed, as well as tension rollers, pump and pulleys.

Cracks on a worn timing belt

How does the belt work?

The design and method of operation of this automotive consumable is quite simple. In short, a track belt is simply a long rubber band that is attached to both the crankshaft pulley and the rollers of all the engine components that need to be driven.

When the engine crankshaft rotates, it also drives the reel belt, which in turn drives the air conditioner, alternator, water pump, cooling fan, hydraulic steering, etc.

How to check the timing belt. Self-test steps

The step-by-step process for checking the timing belt looks like this:

removing the engine protection and plastic screen for access to the crankshaft, camshaft, belt, rollers, pump;
unscrewing the bolts from the protection and removing it;
inspection of the element - it is necessary to check the timing belt on both sides for cracks and other damage;
checking the belt tension - the crankshaft must be turned 1-2 turns in different directions, then turn the belt between the camshaft and the crankshaft with the teeth towards you; a sign of normal tension is a rotation angle of 90 degrees.

The tension can be easily adjusted by changing the position of the tension roller. If abrasions, scratches or cracks are found, the belt should be replaced to avoid serious damage.

Checking the timing belt tension

What signs indicate a timing belt replacement: 6 signs

Visually visible cracks and tears are not the only signs of possible failure. There are a number of other symptoms:

Age. The service life of the part is determined by the mileage of the vehicle. But the age of the part also matters. If the car has been sitting idle for a long time and has not accumulated mileage, the belt still loses its original properties of strength and elasticity. On average, after 5 years, the part becomes covered with cracks, regardless of the number of kilometers traveled.
Loss of power or uncertain starting of the internal combustion engine. A worn or weakly tensioned timing belt can jump over several teeth on the pulley. In this case, the function of the ignition system is disrupted - the fuel mixture ignites earlier or later than the specified time. At the same time, the driver feels that there are gaps in the traction, the internal combustion engine starts up uncertainly, and vibrations occur.
Black smoke. If the timing belt is faulty, the mixture in the engine does not burn completely, which leads to destruction or melting of the catalyst. In this case, a portion of unused fuel penetrates into the exhaust system, resulting in the permissible temperature being exceeded. An obvious symptom of this situation is that the exhaust is accompanied by popping sounds, and the color of the smoke from the chimney is black.
Extraneous sounds in the engine. If the timing belt is cracked or frayed, you can hear characteristic ticking, clicking and other sounds from under the unit casing. Typically, the frequency of sounds increases with increasing engine speed.
Leaks in the drive. If oil or coolant is leaking, there is obviously a problem with the gas distribution mechanism. When the crankshaft oil seal wears out, some of the lubricant gets onto the belt. If the joints have lost their tightness, the belt is coated with antifreeze. As a result, the assembly deteriorates faster and jumps over the teeth of the pulleys.
Starter idling. If, when idling, the combustible mixture is not picked up and ignited in the cylinders, then there is no compression. This indicates mechanical damage to the valves, which are bent when meeting the pistons. This is the worst consequence of a broken timing belt. You will have to change the engine or send it for an expensive restoration.

How to pull the alternator belt yourself: instructions, tips

After replacing the timing belt, it should be properly tensioned. Let's talk about this...

Evgeniy 12/01/2019, 14:11

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The timing belt is an important element of the engine. It ensures proper operation of the valves. It is necessary to ensure that the timing belt tension is always sufficient. This will make the operation of your car more stable and longer.

The belt ensures proper operation of the valves. The belt is tensioned on the camshaft and crankshaft wheel. Therefore, it regulates the process of closing and opening the valves at certain times. If you skip replacing the belt, serious damage to your car's engine may occur. Most often, a rupture of the belt drive while driving leads to cranking and bending of the valves. Such a breakdown will cost much more to repair than replacing a belt.

In addition, due to stretching or weakening of this drive, other serious problems may occur. In this case, an incorrect gas distribution process is observed. At the same time, other elements of the engine structure also begin to wear out faster.

Timely replacement of the timing belt will prolong the operation of the engine and the car as a whole.

Replacing and tensioning the belt is carried out in two cases, namely:

when a routine check of the entire gas distribution mechanism is carried out;
if repairs were made to elements of the timing system.

To find out if the belt is tensioned correctly, you need to do the following. Take a regular canter and a ruler. Then everything is simple. Hook the canter hook onto the timing belt and pull. The scale dial should show a value of 10 kilograms. At this moment, measure the distance by which the drive has deviated. If the value is less than 5 and a half millimeters, then the tension is normal. When the value is greater than the specified figure, the timing belt needs to be tensioned.

In addition, if, when inspecting the drive, cracks, abrasions, or lack of teeth on the inside are visible, this indicates that the belt needs to be replaced. It is recommended to check the correct tension and inspect the belt every 15-20 thousand mileage. It is easy to tension the belt yourself.

To carry out such repairs, you will need the following tools:

Special key for adjustment. If you don't have this in your arsenal, don't worry. The key design is quite simple. Essentially, it is a long bar with two tendrils at the end. You can make such a key yourself.
A set of regular open-end wrenches.

That's really all that's needed. Now we will consider in detail the process of replacing and tensioning the drive.

The first thing to do is to place the car in a convenient place. You must have easy access to the vehicle. Next you need to turn off the power to the car. To do this, remove the terminals from the battery.
Let's see if there is a protective cover on the timing drive. If it is, then it must be removed. It can be removed using wrenches.
Now you need to find the tension roller. It is usually located between the camshaft and crankshaft gears. At the same time, it presses the belt itself, so finding it will not make it difficult for you.
Having found the video, you need to relax it. To do this, unscrew the nut on the fastening.
When the tensioning element is loosened, you need to remove the timing belt, unless, of course, you plan to change it.
We put a new belt on the gears.
Now you will need to properly tension the drive. To do this, take a special key and insert its horns into the holes of the adjusting nut. It is located in the same place as the tension roller, which was previously weakened. Next, we begin to turn the key counterclockwise.
After tensioning the belt to the desired state, you will need to hold the tension roller. After this, tighten the roller fastening nut.
When the tensioning of the timing belt is completed, we check its correctness. To do this, we use hand scales and a ruler. If something doesn’t work out, you need to do the whole procedure all over again.
When the tension check is completed, you can close it with a protective cover. To do this, install the previously removed cover and secure it.
After replacing and tensioning the belt, connect the battery and start the engine. The belt should be tensioned so that it does not squeal. At the same time, pay attention to the operation of the pump and generator.

Tensioning the timing belt is a simple procedure. The main thing is not to overdo it. An over-tightened drive most often causes the pulley on which the gears are located to bend.

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Timing belt, tension roller

The timing of replacement is precisely regulated in the vehicle instructions by each manufacturer. But you should not rely entirely on official instructions, since in reality the part may wear out earlier than expected. Auto mechanics recommend checking the part every 40,000-45,000 km.

Cracks on a worn timing belt

The step-by-step process for checking the timing belt looks like this:

removing the engine protection and plastic screen for access to the crankshaft, camshaft, belt, rollers, pump;
unscrewing the bolts from the protection and removing it;
inspection of the element - it is necessary to check the timing belt on both sides for cracks and other damage;
checking the belt tension - the crankshaft must be turned 1-2 turns in different directions, then turn the belt between the camshaft and the crankshaft with the teeth towards you; a sign of normal tension is a rotation angle of 90 degrees.

The tension can be easily adjusted by changing the position of the tension roller. If abrasions, scratches or cracks are found, the belt should be replaced to avoid serious damage.

Checking the timing belt tension

Visually visible cracks and tears are not the only signs of possible failure. There are a number of other symptoms:

Age. The service life of the part is determined by the mileage of the vehicle. But the age of the part also matters. If the car has been sitting idle for a long time and has not accumulated mileage, the belt still loses its original properties of strength and elasticity. On average, after 5 years, the part becomes covered with cracks, regardless of the number of kilometers traveled.
Loss of power or uncertain starting of the internal combustion engine. A worn or weakly tensioned timing belt can jump over several teeth on the pulley. In this case, the function of the ignition system is disrupted - the fuel mixture ignites earlier or later than the specified time. At the same time, the driver feels that there are gaps in the traction, the internal combustion engine starts up uncertainly, and vibrations occur.
Black smoke. If the timing belt is faulty, the mixture in the engine does not burn completely, which leads to destruction or melting of the catalyst. In this case, a portion of unused fuel penetrates into the exhaust system, resulting in the permissible temperature being exceeded. An obvious symptom of this situation is that the exhaust is accompanied by popping sounds, and the color of the smoke from the chimney is black.
Extraneous sounds in the engine. If the timing belt is cracked or frayed, you can hear characteristic ticking, clicking and other sounds from under the unit casing. Typically, the frequency of sounds increases with increasing engine speed.
Leaks in the drive. If oil or coolant is leaking, there is obviously a problem with the gas distribution mechanism. When the crankshaft oil seal wears out, some of the lubricant gets onto the belt. If the joints have lost their tightness, the belt is coated with antifreeze. As a result, the assembly deteriorates faster and jumps over the teeth of the pulleys.
Starter idling. If, when idling, the combustible mixture is not picked up and ignited in the cylinders, then there is no compression. This indicates mechanical damage to the valves, which are bent when meeting the pistons. This is the worst consequence of a broken timing belt. You will have to change the engine or send it for an expensive restoration.

Many car owners are interested in the question: how to tighten the alternator belt? After all, the battery charge level and the voltage in the car’s electrical network depend on this. Also, the condition of the belt itself, as well as the condition of the crankshaft bearings and the generator shaft, depend on how the generator belt is tensioned.

Let's consider what unpleasant consequences an incorrect level of tension will lead to. If it is weakened, then there is a high probability of slippage. That is, the generator drive will not operate at rated speed, which in turn will lead to the level of voltage generated by it being below normal.

The result is an insufficient level of battery charging, insufficient electricity to power the vehicle systems, and operation of the electrical system under increased load.

If the belt is too tight, this can also cause excessive wear on the belt itself. And in the worst case, even to its breakage. Also, excessive tension has a detrimental effect on the bearings of the crankshaft and generator shaft, because they have to work under conditions of increased mechanical load. This leads to excessive wear and speeds up their failure.

Tension check

Tension checking process

Now let's look at the issue of checking tension. It’s worth mentioning right away that the force values are unique and depend not only on the make and model of the machine, but also on the generators and belts used. Therefore, look for the relevant information in the manuals for your car or in the operating instructions for the alternator or belt.

VAZ "Ten"

1 VAZ "ten"
2 Audi 100
3 Volkswagen
4 Kia