 printable version
Check compression pressure assessment cylinders
Check the compression pressure  | To perform the verification procedures of the compression pressure will need assistance assistant. |
Measurement of compression pressure allows an overview of the current state of internal engine components such as cylinder head gaskets, valve train components, pistons and piston rings. Analysis of the test results to determine whether the engine is in need of major refurbishment, or simply replace the head gasket. The measurement is made using the compression tester. | For diesel engines Compression needs to limit measurements to about 40 atm. |
Warm up the engine to normal operating temperature (80 ?� C), make sure of the completeness of the battery charge. Petrol models To measure the compression pressure should be used equipped with a remote starter switch meter (shown on the model 202)
Diesel models Checking compression pressures on diesel models equipped with engine series 612 Checking compression pressures on diesel models equipped with engine series 628
| - Turn off the engine and remove the diffuser sleeve tract and cover the cylinder head cover / air cleaner assembly (see chap. Power supply system and exhaust). Turn the key to "ignition" position 0.
|
|
M612 To measure the compression pressure should be used equipped with a remote starter switch meter (shown on the model 202)
M628 All models | - Compare the results of the measurement requirements of the Specifications.
- Maximum permissible differential pressure in the individual cylinders can be 1.5 atm (for petrol engines) and 3.0 bar (for diesel engines).
- Compression in the serviceable engine is growing very fast. Low value shown after the first cycle, increases with subsequent cycles indicates the wear of piston rings. Low value after the first cycle does not increase after the next, indicating that any leaking valves or broken head gasket (the reason could also be a crack in the head). To decrease the compression may result in the presence of carbon on the valve plates.
- It should be borne in mind that because of the different speed starter for different models obtained from measurement results may vary. The results obtained in the measurement of compression should be approximately the same for all cylinders.
- If the pressure in any cylinder is at the minimum allowed, and even below, to determine the cause, follow these steps. Pour into the cylinder through the spark plug hole teaspoon of motor oil and repeat the measurement of compression.
- If the addition of oil temporarily improved compression, the cause of its decline, most likely, is the wear of the piston rings or cylinder. If you increase the compression has occurred, it can be assumed that the reason - valve or a leak in a broken head gasket.
- Low compression in two next cylinders almost certainly - a consequence of the breakdown of head gaskets. The presence of coolant in the combustion chamber or in the crankcase will confirm this assumption.
- If compression in one of the cylinders by approximately 20% lower than in the other, to the same idle speed is unstable, then the reason may be excessive wear of the cam of a camshaft.
- Once validated, replace the spark, connect it to the electrical wiring in the gasoline engines Restore initial connection of the coil (EC) ignition. Replace the plastic cover of the engine and the fuel pump fuse.
|
|
Check cylinder for leaks During this test determines the rate of release of the cylinders are injected into the compressed air directly leaks. This test is an alternative to compression check. Moreover, from many points of view, it is much more effective as visually identify the source of the leak is easier to comprehend than the results of the measurement of compression. All models | - Warm up the engine to normal operating temperature (80 ?� C), then stop it.
|
|
Petrol models Checking cylinder gasoline engines for leaks
| - Carefully turn the latch cover equipped with built-in (2) the expansion tank (1) cooling system to the first stop, wait for the release of pressure, then unscrew the cap completely.
- Remove the spark plug (19).
- Turning the engine at the central bolt of the crankshaft in the normal direction, bring the piston to be tested cylinder in position TDC, then connect to the appropriate spark plug hole special tester (04), previously calibrate it - act in strict accordance with the enclosed instructions .
- Remove the filler cap of the motor oil (3).
- Apply the compressed air into the cylinder and the speed of the meter vote collapse. Result record.
- Repeat the test for the remaining cylinders, - act in the order of ignition (see chap. Systems of an electric motor).
- Disconnect the meter and replace the spark plug.
|
|
Diesel models Checking cylinder diesel engine for leaks  | - Turn the cover (1) the expansion tank (2) cooling system anti-clockwise half a turn, wait for the release of pressure, then remove the cover completely.
- Remove the trim panel of the engine (M612) / air cleaner assembly (M628).
- Remove the glow plug (R9).
- On models equipped with engine series 628, remove the supercharging air cooler (see chap. Power supply system and exhaust).
- On models equipped with engine series 612, remove the viscous clutch fan cooling system (see chap. System of cooling, heating, ventilation and air conditioning).
- Turning the engine at the central bolt of the crankshaft in the normal direction, bring the piston to be tested cylinder in position TDC, then connect to the appropriate spark plug hole special tester (04), previously calibrate it - act in strict accordance with the enclosed instructions .
- Proceed in a manner similar to that described above for gasoline engines (see. Paragraphs 4 to 7 points Check cylinders for leaks - petrol models).
|
|
All models | - Compare the test results with the requirements of the Specifications. If necessary, make necessary regenerative repair.
|
|
Check the cylinders using a lamp-sampler Petrol models Checking cylinder petrol engines with the help of a lamp-sampler 
| - Remove the spark plugs.
- Turning the engine in the normal direction of the central bolt crankshaft, bring piston cylinder to be tested in the position of the BDC.
- Acting strictly in accordance with the manufacturer's instructions, connect the special lamp-sampler (05) tuck its flexible waveguide to the appropriate spark plug hole and make a visual assessment of the condition of the cylinder wall, which should have a matte finish without a trace honingovochnoy notches.
- Operating in a similar manner, perform the inspection of the remaining walls of the cylinder (in order of ignition).
- If necessary, remove the engine, the cylinder head, and make a more detailed inspection of cylinder bores direct and necessary regenerative repair.
|
|
Diesel models  | - Remove the key from the ignition "Ignition."
- Remove the trim panel of the cylinder head (M612) / air cleaner assembly (M628).
- Remove the glow plug (R9).
- Remove the injectors (Y76) (see chap. Power supply system and exhaust).
- On models equipped with engine series 628, remove the supercharging air cooler (see chap. Power supply system and exhaust).
- On models equipped with engine series 612, remove the viscous clutch fan cooling system (see chap. System of cooling, heating, ventilation and air conditioning).
- rovorachivaya engine at central bolt of the crankshaft in the normal direction, bring the piston of the cylinder to be tested in the position of the BDC.
- Proceed in a manner similar to that described above for the gasoline engine (see. Paragraphs 3 to 5).
|
|
|
