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 spark plugs.
4. Remove the spark plugs.
5. Turn the crankshaft to remove debris from the cylinders.
6. Attach the pressure gauge to the spark plug hole.
7. Press the throttle pedal until it is fully open.
8. Turn the crankshaft and read the pressure gauge.
- Normal value is 1200 kPa
- Limit value - 1050 kPa
9. Repeat steps 6 through 8 for all cylinders and ensure 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 specified limit, add a small amount of oil through the spark plug hole and repeat steps 6 through 9.
- 1) If adding oil results in increased compression, this means that the clearance 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 a stuck valve, worn valve seat, or leaking cylinder head gasket.
- Tightening torque: Spark plugs - 20-30 Nm.