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 tension wires from the spark plugs.
4. Remove the spark plugs.
5. Turn the crankshaft with the handle to remove foreign particles from the engine cylinders.
6. Install the compression gauge into the spark plug hole.
7. Press the gas pedal to fully open the throttle valve.
8. Turn the crankshaft; handle and read the compression meter readings.
Standard values (at 250-400 rpm):
- for 1.5 l engines - 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 specified in paragraphs 6-8 on all cylinders and make sure that the compression in each cylinder 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 higher than 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 results in increased compression, a possible reason for the decrease in compression is an increase in the gap between the piston rings and the cylinder wall due to their wear.
- 2) If the compression remains unchanged after adding oil, then the possible cause of low compression is: valve sticking, loose valve seating, or gas leakage through leaks in the cylinder head gasket.
- 3) Connect the wires to the spark plugs.
Tightening torque: Spark plug - 20.4-30.6 Nm