2. Start the engine and wait until the temperature of the precipitating liquid reaches 80-95°C.
3. Stop the engine and disconnect the high voltage wires from the spark plugs.
4. Turn out spark plugs.
5. Turn the crankshaft with the handle to remove foreign particles from the engine cylinders.
6. Install a compression gauge in the spark plug hole.
7. Step on the gas pedal to fully open the throttle.
8. Turn the crankshaft; handle and read the compression gauge.
Standards value (at 250-400 rpm):
- for engines 1.5 l — 16.5 kg/cm2
- for 1.3 l engines 13.5 kg/cm2
- Limit value - 15.5 kg/cm2
- Limit value - 12.5 kg/cm2
9. Repeat the operations indicated in paragraphs. 6-8 on all cylinders and make sure that the compression in each and cylinders is within the above limit, and the difference in readings does not exceed the limit:
Limit: Maximum 1.6 kg/cm2 between individual cylinders.
10. If the compression in one of the cylinders is below normal or the difference in compression in different cylinders is above the limit, add a small amount of oil to the cylinder through the spark plug hole and repeat the operations specified in paragraphs. 6-9.
- 1) If adding oil will increase compression, a possible cause of low compression is an increase in the gap between the piston rings and the cylinder wall due to wear.
- 2) If the compression remains unchanged after adding oil, then a possible cause of low compression is: valve sticking, a loose valve seat in the seat, or gas breakthrough through leaks in the cylinder head gasket.
- 3) Connect the wires to the spark plugs.
Tightening torque: Spark plug - 20.4-30.6 Nm