Warning: The engine or engine oil may be hot and cause burns. Use caution when removing or installing any parts.
If the engine develops insufficient power, has increased fuel consumption, unstable idle speed, perform the following check operations:
1. Make sure the battery is fully charged. If necessary, charge the battery.
2. Warm up the engine to normal operating temperature,
3. Turn off the engine and wait 10 minutes for it to cool down.
4. Remove the engine trim panel.
5. Remove the fuel accumulator (see chapter "Fuel injection system"),
6. Remove the glow plugs (see chapter "Engine electrical equipment").
7. Install the compression tester nipple into the glow plug hole.
8. Turn the crankshaft using the starter and record the maximum value of the pressure at the end of the compression stroke.
Attention:
- Stay clear of spark plug/glow plug holes while cranking engine with starter.
- If during the measurement of the pressure at the end of the compression stroke in the cylinder (as a result of cracks appearing) if coolant, oil, fuel, etc. gets in, these substances will heat up and fly out of the spark plug hole under pressure, which is dangerous.
9. Perform the described check for each cylinder. Turn the crankshaft the same number of revolutions.
Compression stroke end pressure (at 200 rpm):
- nominal - 2942 kPa
- minimum - 2648 kPa
If the maximum pressure in one of the cylinders is low, pour a small amount of clean engine oil into the cylinder and check the pressure again.
- If the pressure has increased, this may indicate wear of the piston, piston rings, and cylinder, and the need for repair of the cylinder-piston group.
- If the pressure does not rise, this indicates that the valves are faulty and require repair.
- If the pressure in two adjacent cylinders remains low, this indicates a blown cylinder head gasket or a warped cylinder head.
10. Remove the compression gauge.
11. Installation of parts is carried out in the reverse order of removal.