Replacement of the cylinder head gasket VAZ-2112 (16 valves) with your own hands
The engine for reliable and well-coordinated work is needednot 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 GAZ VAZ-2112 (16 valves) is replaced on its own. Also consider the symptoms of this phenomenon.
Causes of malfunctions
There are several reasons whythe 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 cooling liquid enters the surface.
Another common reason for whichreplacement of the gasket, this is engine overheating. Therefore, you must 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.
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 is connected to 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 antifreeze begins to foam. You will notice, as on the dipstick and the cap of the filler neck, a characteristic emulsion - mayonnaise is formed. This phenomenon looks like the picture below.If you watch at least one of thethe above symptoms, it means that 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 look at how this operation is performed.
To replace the gasket cylinder head VAZ-2112 (16 valves) was successful and fast, you need to prepare the following set of devices:
- Torque wrench.
- Set of end heads and keys.
- Capacity for coolant (volume not less than 7 liters).
- Clean rag and degreaser.
- New gasket and sealant for it.
So, open the hood and extract the minus onethe battery terminal. 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). Next, unscrew the exhaust manifold mounting bolts.Now you need to remove attachments. First we remove the high-voltage wires, turn off the chips from the temperature sensors and the oil pressure sensor. We also remove the pipe from the vacuum cleaner. Disconnect the ignition distributor. 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 by means of two minus screwdrivers. Then unscrew the nuts that hold the rear timing case, and remove the plastic element itself. With a cross-head screwdriver we loosen the hose clamps that go to the intake manifold of the cylinder head. With the help of a hexagon, you need to unscrew the bolts securing the head itself. Important point - 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 withhead. 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.
At installation it is necessary to prepare carefullyblock surface and cylinder head. It is cleaned of the old sealant and all the roughness is removed. It is not allowed to have oil in the places where the elements come in contact. There must be only a red sealant. Therefore, 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.
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 - the 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. Do not tighten the screws "by eye". If the tightening is incorrect, a repeated breakdown or a gasket burn is possible.
Assembly of attachments is performed inreverse sequence. 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 projecting 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.