2. Start the engine and warm it up to a temperature of 80-90°C.
3. Loosen the fuel line fastening nuts and disconnect the fuel lines from the injectors.
4. Remove the ramp and unscrew all 4 injectors.
5. Set the engine speed value on the pressure gauge.
6. Place the pressure gauge adapter into the nozzle hole
7. Turn the engine over with the starter with the air damper fully open and read the pressure gauge. The standard compression value at 250 rpm is 1920 kPa, the difference in values between cylinders is no more than 300 kPa.
8. If the compression value in one of the cylinders or its difference relative to other cylinders does not correspond to the norm, pour a small amount of engine oil into the cylinder through the hole under the injector and repeat the measurements.
9. If the compression has increased after adding oil, this indicates an increase in the gap between the piston rings and the cylinder wall due to wear. If the compression value remains the same, the cause is a loose valve fit or poor seal between the cylinder block and the cylinder head.