The head of the cylinder block is one of the most important elements of the internal combustion engine. As a rule, this is a monolithic element from cast iron or aluminum alloys, which forms the upper combustion chamber department and is a housing for the gas distribution mechanism. It is usually installed through a gasket on the cylinder block and fasten with bolts.

GBC, GBC device

The head of the block performs such important functions as:

1. Provides the maintenance and placement of the elements of the gas distribution mechanism, the components of the removal and flavoring components.
2. Provides gas-dynamic characteristics of the air charge, remove combustion products from the combustion chamber.
3. Forms a combustion chamber and provides its tightness, brings and removes oil for elements of the gas distribution mechanism.
4. Provides the vehicle compliance with environmental standards for emission to the atmosphere of harmful substances.

The cylinder head includes:

1. Guide sleeves.
2. Valve seat.
3. Hydrocompensator (can go bundled with a rocker).
4. Rocker valve.
5. Traverse.
6. Spark plugs (for gas and gasoline engines).
7. Springs to return to the starting position of the valves.
8. Fuel nozzles (usually used in diesel engines).
9. Graduation and intake valves.

The material from which the cylinder is made can be aluminum (for example, CFC VAZ 2109) or pig-iron (diesel). As a rule, for manufacturers in priority aluminum heads, as they are the most convenient in processing, manufacturing and repair. However, on some diesel engines, cast-iron heads are used, because the detonation properties of diesel fuel are superior to the strength parameters of aluminum heads, which can lead to a reduction in operating life or to the destruction of the GBC.

GBC can be divided into two types - mono-heads and individual heads. The latter have several advantages that are related to maintainability, low cost and simplicity for maintenance. However, most of the world's vehicles and autoelempics prefers monogols, which also have their advantages.

The principle of operation of the GBC: the camshaft pushes the bar, which presses the hydrocommoventrator, and then on the rocker, which puts pressure on the valve, which opens and penetrates the combustion chamber where the candle is flammable.

Repair assistants tools

1. Manual for the maintenance and repair of your vehicle.
2. Dynamometric key.

CHBC, how to remove the cylinder headguad instruction

1. First you need to disconnect and remove the battery, drain the engine oil and coolant.
2. Then you should make dismantling of attachments, in particular, disconnect the ignition wires, disconnect all hoses - cooling systems, vacuum. Do not forget when disconnecting hoses and wires to make them marking.
3. Next, dismantle the fuel lines and the accelerator cable.
4. After that, we remove the rest of the attached equipment that interferes with removing the block head.
5. Now remove the cylinder head cover.
6. Then dismantle the casing of the gas distribution mechanism and the pulley belt. The camshaft can not be touched.
7. We unscrew the cd fastening bolts and remove it.

GBC bolts, how to remove the GBC bolts according to the scheme

Turning the bolts of the cylinder cylinder bolts simultaneously with the help of a dynamometric key, controlling the state of the bolts.

Do not forget about the compliance with the sequence during the promotion, which should be the return tighten. Removing the CBC bolts must be carried out according to the appropriate scheme, which is individual for each transpotator model and can be found in the car operating manual.

Diagnosis of GBC.

1. The visual inspection method it is necessary to detect visible defects - worn out of the valves, sinks from corrosion, broken studs visible to the naked eye of a crack, disrupting the threads, candles, and so on.
2. Sealing the cooling system of the GBC, fill with gas under pressure and immerse in hot water. The crack find on emerging bubbles. At the moment, this method of diagnosis of the GBC is the most effective. Ultrasound and X-rays have not yet justified.

Replacing bushings, repair sleeve valve, step-by-step instructions

1. Slowly and extremely carefully knock the sleeves.
2. Clean the released place.
3. It is advisable to blow the sleeve with compressed air.
4. New sleeves should be withstanding about two days in the freezer, whatever they have been compressed and smoothly fit in the landing location.
5. Heat the GBC on the electric stove to expand the seats.
6. We put on the locking rings on the sleeve, insert into the holes and carefully begin to drive them into the holes.

Titted valve saddles, wishes task

To date, in fact do not apply this operation. If the chamfer of the valve and the saddle are accurately processed, then the trigger is not needed at all. Another thing during manual processing of elements by incisive heads and cutters. After repairing the surfaces may have a small roughness.

Print is necessary not only for processing, but also to monitor the quality of the conjugation. If you wipe dry surfaces and turn the valve in both directions several times, pressing the seat, then a shiny line is formed on the chamdes of the elements. If it is closed and pass throughout the circumference, it is good and everything is done correctly.

Tips of professionals

More useful information about the repair of the head of the block you can learn from the video: