Compression check in engine cylinders

During the combustion of a combustible mixture in the combustion chambers of the cylinders is pressurized about 6 MPa, which creates a high load on the pistons and piston rings, cylinder walls and valve seats and seals.

The best performance at a relatively low consumption of gasoline engine features with good sealing piston rings, when all the fuel mixture used for useful work. In the case of leakage of the valves and piston rings an increased consumption of oil and fuel, power reduction and complicated start a cold engine, as well as an increase in environmental pollution. If so, it is necessary to measure the compression of individual cylinders of the engine via a special device - compression tester, and based on what is determined by how tight valves and piston rings.

Measurement of compression performed as follows:

- Warm up the engine to operating temperature as hot piston rings provide better tightness;

- Turn off the ignition;

- Remove all spark plugs;

- Remove the crankshaft position sensor and remove the three-pin plug connector 1 (Fig. 159) of the ignition coil;

- Open the throttle with an assistant, who presses the accelerator pedal;

- Firmly into the rubber cone compression tester in the hole of the first candle;

- Crank the engine with the assistant starter and measure the amount of compression in the cylinder. The engine is cranked up until the arrow compressometer will no longer rise, ie shows maximum compression;

- In a similar manner, check turns the other cylinders of the engine.

It is normal, if the compression of any one of the cylinders does not fall below 80% of the maximum obtained when measurement of all the cylinders.

Low compression or having large differences in the different cylinders, the result of wear of piston rings, that can also be defined by increased oil consumption.

The amount of compression of the engine should be at least 750 kPa. If the result of measurement of compression is approximately equal to that value, then pour a little engine oil into the engine through the spark plug hole, and repeat the measurement. If after that:

- The result is better, then we can assume that the cause of low compression are worn piston rings or cylinder walls;

- The result was approximately the same as the cause of low compression are likely to be one or more malfunctioning valve or may be leaky cylinder head gasket. In any case, you should remove the cylinder head and a thorough inspection to determine the cause of the fault.

In commercially available oil additives, which after bay provides additional tightness of the piston rings. In most cases, produced by this effect is very short-lived, however, there are times when it really helps. On HUNDRED ?�Volkswagen?�, you can get information to buy the best product of its kind.