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Replacement of gasket ГБЦ ВАЗ-2112 (16 valves) with own hands

The engine for reliable and well-coordinated operation requires not only lubrication, but also good cooling. Therefore, there are separate channels in the block and the head. Some are designed for circulation of oil, the second - for antifreeze. They do not overlap with each other. To prevent mixing of these two liquids, a gasket is used in any motor. The motor at the junction between the unit and the head must be sealed. If this is not the case, the motor will be damaged. Today we will talk about how the gasket of the cylinder head VAZ-2112 (16 valves) is replaced on its own. Also consider the symptoms of this phenomenon.

Causes of malfunctions

There are several reasons why the car needs to replace the cylinder head gasket. VAZ-2112 (16 valves) stops working normally due to natural wear of the gasket. As a rule, this happens to 200 thousand kilometers. If the part has been incorrectly installed (with non-observance of the tightening torque), the replacement period may occur much earlier. The next reason is the deformation or deflection of the sealing element. This leads to breakdown, as a result of which a coolant enters the surface.

Another common reason for replacing the gasket is engine overheating. Therefore, you should always monitor the state of the cooling system and change the antifreeze in time. Experts recommend to make a replacement every 50 thousand or once in 2 years. For antifreeze, this regulation is 4 years.

Symptoms

How to determine the breakdown of the gasket? You can find out the problem by several symptoms. The first sign is the characteristic color of the exhaust. You'll notice steam coming out of the exhaust pipe. In places where the block joins the head, traces of antifreeze will be visible (but not always). Check the fluid in the expansion tank. It should not go away and contain oil stains. If the antifreeze gets into the lubrication system, the oil begins to foam. You will notice how a characteristic emulsion - mayonnaise is formed on the dipstick and cap of the jellied mouth. This phenomenon looks like the picture below. If you observe at least one of the above symptoms, then your car needs a replacement cylinder head gasket. VAZ-2112 (16 valves) has almost the same device as the engine SOHC, except for the size of the head and the number of intake and exhaust valves. Well, let's consider how this operation is performed.

Instruments

To replace the cylinder head gasket VAZ-2112 (16 valves) was successful and fast, you need to prepare the following set of devices:

  • Torque wrench.
  • Set of face heads and keys.
  • Capacity for coolant (volume not less than 7 liters).
  • Clean rag and degreaser.
  • New gasket and sealant for it.

Replacement

So, open the hood and remove the minus terminal from the battery. Then you need to merge the antifreeze from the system. Unscrew the cock on the radiator and the cap of the expansion tank (so that there is no vacuum inside). Then unscrew the bolts securing the exhaust manifold. Now you need to remove the attachments. First we remove the high-voltage wires, turn off the chips from the temperature sensors and the oil pressure sensor. Also we remove the pipe from the vacuum cleaner. Disconnect the ignition switch. We remove the body of auxiliary units. Further it is required to loosen the tension bolt bolt. After that, the timing belt and the tensioner are removed. Then it is required to fix the pulley of the camshaft so that it does not scroll. The element is removed using two minus screwdrivers. Then unscrew the nuts that hold the rear timing cover, and remove the plastic element itself. With a cross-head screwdriver we loosen the hose clamps that go to the intake pipe of the cylinder head. Using the hexagon, you need to unscrew the bolts securing the head itself. The important point is that the screws are removed with washers. The cylinder head is removed with the gasket together.

What should I look for?

Pay attention to the condition of the screws. If their length is more than 135 millimeters, they are no longer suitable for use. Before installing new ones, you should treat the threads in engine oil abundantly. Inspect the contact surface of the unit with the head. It should be smooth, smooth, without scoring and other defects. Also check it for bending (use a level construction level). Perhaps, after the breakdown of the gasket, the engine overheated. In this case, the block head is deformed. How to fix it? Solve the problem by grinding. But remember that the number of grinding heads is limited. Perhaps the head was already sharpened before you. When installing the gasket on the deformed head, it is possible to leak oil and coolant.

Installation

When installing, carefully prepare the surface of the unit and cylinder head. It is cleaned of the old sealant and removed all roughness. It is not allowed to have oil in places where the elements come in contact. There must be only a red sealant. Therefore, we thoroughly degrease the surface with alcohol or gasoline. Use a clean pile rag. Then the head can be installed and tightened the bolts. It is important to observe the moment of effort.

Torque

Bolts are twisted according to the scheme "from the center along the edges". The tightening is carried out in four stages. At the first moment, the tightening torque should be 20 Nm. On the second - effort from 70 to 85 Nm. Then you have to turn each bolt 90 degrees. At the final, fourth stage, the bolts are re-scrolled 90 degrees. The tightening is carried out with a torque wrench. It is not necessary to tighten the bolts "by eye". If improperly tightened, it is possible to re-break or burn gasket.

Assembly of attachments is carried out in the reverse order. It is important not to scroll the crankshaft and camshaft before the belt is installed. The pulley of the camshaft is installed in such a way that the protruding part of the hub is turned to the motor. Check the belt tension and assemble the remaining components. At this stage, the replacement of the cylinder head gasket VAZ-2112 (16 valves) was successfully completed. It remains only to top up the antifreeze and start the engine.

Conclusion

So, we found out how the GVC VAZ-2112 gasket (16 valves) is being replaced with our own hands. As you can see, the procedure can be performed independently.

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