Caution: The engine or engine oil may be hot and cause burns. Be careful when removing or installing any parts.
If the engine develops insufficient power, has an increased fuel consumption, an unstable idling speed, carry out the following test operations:
1. Make sure the battery is fully charged. If necessary, charge the battery.
2. Warm up the engine to normal operating temperature,
3. Stop the engine and wait 10 minutes for it to cool down.
4. Remove the finishing panel of the engine.
5. Remove fuel accumulator (see chapter "fuel injection system"),
6. Remove glow plugs (see chapter "Engine electrical equipment").
7. Install the compression gauge fitting into the glow plug hole.
8. Use the starter to turn the crankshaft and record the maximum pressure at the end of the compression stroke.
Attention:
- Keep clear of spark plug/glow plug holes while cranking with starter.
- If during the pressure measurement of the end of the compression stroke into the cylinder (as a result of cracks) coolant, oil, fuel, etc. gets in, these substances will heat up and fly out under pressure from the spark plug hole, which is dangerous.
9. Carry out the described test for each cylinder. Turn the crankshaft the same number of revolutions.
Compression 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 risen, this may indicate wear on the piston, piston rings and the cylinder and the need to repair the cylinder-piston group.
- If the pressure does not rise, this indicates a malfunction of the valves and the need for repair.
- If the pressure in two adjacent cylinders remains low, this indicates a blown cylinder head gasket or head deformation.
10. Remove the compression gauge.
11. Installation of details is made in sequence, return to removal.