2. Start the engine and wait until the coolant temperature reaches 80-95°C.
3. Turn off the engine and disconnect the wires from the candles.
4. Turn out candles.
5. Rotate the crankshaft to remove debris from the cylinders.
6. Attach a pressure gauge to the spark plug hole.
7. Press the throttle pedal to fully open it.
8. Rotate the crankshaft and read the pressure gauge.
- Normal value - 1200 kPa
- Limit value - 1050 kPa
9. Repeat steps 6 to 8 for all cylinders and check that the pressure difference between the cylinders is within acceptable limits.
- Limit value: Max. 100 kPa
10. If the compression or pressure difference in the cylinders is below the limit value given, add a small amount of oil through the spark plug hole and repeat steps 6 to 9.
- 1) If the addition of oil results in an increase in compression, this means that the gap between the piston rings and the cylinder bore has been exceeded due to wear.
- 2) If the compression remains at the same level, the cause may be valve sticking, valve seat wear, or head gasket leaks.
- Tightening torque: Spark plugs - 20-30 Nm.