2. Turn off the engine and wait until the temperature of the coolant in the engine reaches 80-95°C.
3. Start the engine and disconnect the spark plug wires.
4. Remove the spark plugs.
5. Rotate the crankshaft to remove blockages from the cylinders.
6. Install a compression gauge in the spark plug hole.
7. Squeeze out the accelerator pedal until its full opening of the damper.
8. Turn the engine crankshaft and take the instrument readings.
- Limit value: 12.0 kg/cm2 [250-400 rpm].
9. Repeat steps 6-8 on all cylinders, making sure that the pressure difference across the cylinders is within the specified limits.
- Limit value: Max, difference 1.0 kg/cm2 between cylinders.
10. If the compression or differential pressure in the cylinders is below the specified value, add a small amount of oil through the spark plug hole and repeat steps 6 - 9.
- 1) If the addition of oil helped increase compression, then there is a possibility of wear between the piston rings and the cylinder bore.
- 2) If the compression remains the same, then the probable reasons for this may be sticking valves, poor valve seat condition, or a leaky cylinder head gasket.
- Tightening torque: Spark plug 20-30 Nm.