Signs of a broken cylinder head gasket VAZ

2024 Author: Erin Ralphs | [email protected]. Last modified: 2024-02-19 11:41

One of the main parts of any engine is the cylinder block. A breakdown of his head threatens to overhaul the power unit. Moreover, signs of a broken cylinder head gasket (Kalina is no exception) can occur after 100 thousand kilometers. It is absolutely impossible to drive with this malfunction. But how to determine this failure? Today we will find out what to do if the cylinder head gasket is pierced, what are the signs and causes of this phenomenon.

Why does this happen?

There are some of the most common reasons why this malfunction occurs. The first is overheating of the power unit. Often this happens due to low-quality antifreeze. The driver simply does not have time to keep track of the temperature increase, as a result, overheating occurs. Also, you can not ride on the old antifreeze. This coolant should be changed every 2 years. Over time, it loses its properties, precipitates and heat transfer deteriorates.

In rare cases, motor overheating occurs during power tuning. This can be a turbocharger installation or an increase in the combustion chamber by boring a block. As a result, the motorworks at increased loads and needs better heat dissipation. Another sign of a broken cylinder head gasket on the VAZ-2110 is low-quality or low-octane gasoline. It causes detonation, which, in addition to overheating, greatly affects the resource of KShM parts.

Which gaskets are prone to breakdown?

At the moment there are several types of gaskets:

• Asbestos.
• Paronite.

As practice shows, both types of elements are subject to breakdown. Often this material burns out when overheated. Decreased seal strength. She loses her integrity. Moreover, a breakdown does not always occur with obvious cracks, when the gasket is torn in half. It happens that a breakdown occurs due to small holes that have formed in the material of the product. In order not to get into a major overhaul, you need to know the signs of a broken cylinder head gasket. VAZ-2109 is it or a foreign car - it does not matter. It is not worth driving with such a malfunction. Below we will look at how to determine the breakdown in the cylinder head gasket.

Indirect signs

The first thing you should pay attention to is the behavior of the car on the go. If it has become less dynamic or fuel consumption has increased, be aware that these are signs of a broken cylinder head gasket. With this malfunction, coolant begins to enter the combustion chamber. The antifreeze itself in the expansion tank becomes smaller. Check out the rest of it.

Foam on dipstick

Check the engine oil level. If there are characteristic bubbles on the probe, as in the photo, this indicatesengine malfunction.

It can also be under the oil filler cap. Why does this happen? Since we have a breakdown in the gasket, antifreeze begins to penetrate the oil "shirt" of the engine, mixing with other liquids. It happens that both components are mixed due to a crack in the block (they say “cylinder head led”). At the same time, the gasket itself is intact.

This happens when you try to cool down the engine abruptly. If water is poured on it, it may cause the block to deform.

Exhaust

How else to determine that the cylinder head gasket of the VAZ-2115 is broken? Signs of malfunction - the presence of white smoke from the muffler when the engine is running. As the engine warms up, it does not disappear. This indicates the presence of condensate in the gases.

And since antifreeze contains a certain percentage of distilled water, it goes out through the exhaust system. If such signs of a broken cylinder head gasket are observed (VAZ-2107 is no exception), it is necessary to urgently disassemble the engine “head” and inspect the condition of the sealing element.

Oil in expansion tank

Since both fluids are mixed with such a malfunction, it is possible that oil will enter the expansion tank. Antifreeze itself is oily. But if there are characteristic spots of engine oil inside the tank, these are signs of a broken cylinder head gasket. Sometimes this fluid bubbles up when the engine is running. itThis means that not only oil, but also exhaust gases got into the expansion tank. We urgently need to look for the place where the mixing occurred.

Gasket mounting location

In some cases, at the junction of the head with the block, gases escape from the combustion chamber to the outside. It also leaks oil. But this is already due to improper tightening of the bolts. If this unit was previously repaired, ask the craftsmen with what moment they tightened the bolts. Each vehicle has its own standard. If they tightened "by eye", the cylinder head gasket will soon be broken. Signs (including VAZ-2114) - a strong oil leak at the junction of both engine components. The bolts on the block are tightened with a torque wrench. At the end of the article, we will tell you with what moment you need to tighten the head of the block.

Compressometer to help

Obvious signs of a blown cylinder head gasket are a decrease in compression in one or more cylinders. If in the first cylinder this indicator is 10 (on diesel engines this figure is 2-2.5 times higher), and on the second - only 6, then there is a breakdown inside. This will prevent oil from leaking out through the gaps.

The breakdown occurred between the cylinders themselves. Such a breakdown is the most difficult to determine. But the clear signs of a broken cylinder head gasket in this case are increased fuel consumption and a noticeable drop in traction. With such symptoms, it is recommended to check the compression level. It is performed using the device shown in the photo below.

This element is called a compression gauge. How to use it? The device is screwed in instead of one of the spark plugs. The test starts in order - from the first to the fourth cylinder. As we said earlier, the normal indicator should not be lower than 10. After checking the compression level in one cylinder, we move on to the second. We twist the candle back into the previous one and put on the high-voltage wire coming from the ignition coil. There should not be a strong run-up in the values. By the way, if this is an old engine, scuffs in the combustion chamber are not excluded. Because of this, the compression and oil scraper rings do not fit snugly. This problem can be solved by honing the cylinder walls.

At the same time, the rings change. But you need to do this with professional craftsmen. This service costs about five thousand rubles. As a result, the compression level on a gasoline car can be increased to 12-13 kg/cm2. And this is without engine overhaul.

About cost

The price of a new gasket is from 500 to 3 thousand rubles, depending on the country of origin of the car. Of course, for a domestic car, it will be lower. You can buy this gasket at any automotive store in the city. But do not save and buy the cheapest. There are many fakes on the market now. Look carefully at the quality of the product. If in doubt, choose another manufacturer. Often, poor-quality gaskets burn out within a month after use.

Replacement

If signs of breakdown are confirmedafter removing the “head”, the broken element is replaced. The cylinder block is one of the most important parts of the engine. Therefore, when buying a gasket, experts advise purchasing a set of new mounting bolts. The old ones, when unscrewed, will no longer meet those requirements. New bolts cost no more than a thousand rubles. If you have a 16-valve engine and the length of the elements is at least 95 millimeters, you can limit yourself to buying a gasket. You will also need a torque wrench to replace. Before installing a new gasket, make sure that the cylinder block is intact. If he needs additional grinding, a piece of increased thickness is purchased. It should compensate for the layer of metal removed during grinding.

It is important to clean the mating surface of the block and head from oil stains and dirt. Their presence can cause a re-breakdown. When replacing, it is necessary to drain all technical fluids.

Torque

After installing the part, tighten the bolts with a torque wrench. Tightening is done from the center. First comes the lower and then the upper central bolt. The tightening is done in four steps. First, the bolts are tightened with a force of 2 kilograms per centimeter (for VAZ-2108-21099 cars). Then they are tightened in the second circle with a force of 8 kgfm (also from the center). After that, each bolt is screwed 90 degrees. Then they are tightened again, also by 90 degrees.

Replacement results

After installing a new gasket, it is necessary to fill in all the drainedfluid and check the engine for proper operation. The car should run smoothly and steadily, without white smoke from the exhaust. Acceleration dynamics resumes, fuel consumption decreases. After a while, check the dipstick and antifreeze in the expansion tank. There should be no bubbles or deposits. If done correctly, the part lasts several hundred thousand kilometers.

Conclusion

So, we figured out how to determine the breakdown of the cylinder head gasket with our own hands. This element is designed for the entire resource of the motor and is not a consumable. Therefore, if you do not violate the temperature regime and do not fill in low-octane gasoline, the risk of getting into such a repair is close to zero. By the way, a steel sealing ring is installed on diesel trucks (for example, the Russian KamAZ). This is a fairly reliable solution as metal touches metal. This ring is mounted on four clamping bolts. Therefore, a breakdown of the cylinder head gasket on a KamAZ car is 99 percent excluded, which cannot be said about ordinary cars, of which there are millions on the roads of our country.