Recommendation: If the engine lacks power, has excessive oil consumption or increased fuel consumption, check the end-of-compression pressure.
1. Warm up the engine, then stop it.
2. Disconnect the fuel shut-off solenoid valve connector.
3. Remove the glow plugs (see the relevant section).
4. Measure the pressure in the engine cylinders.
a) Install the compression gauge.
b) While turning the crankshaft with the starter, measure the pressure at the end of the compression stroke.
Recommendation: The battery must be fully charged so that the engine speed is not lower than 250 rpm.
c) Repeat the previous steps for each cylinder.
Warning: These measurements should be taken as quickly as possible.
- Compression stroke end pressure: 32.0 kg/cm²
- Minimum pressure: not less than 20.0 kg/cm²
- Difference between individual cylinders: no more than 5.0 kg/cm²
d) If low pressure is detected in one or more cylinders, pour a small amount of engine oil into the cylinder through the glow plug hole, then repeat the test for that cylinder again.
If adding oil increases the end of stroke pressure, the piston rings and/or cylinder are worn or damaged.
If the pressure remains low, the valve may be stuck or not seating properly, or there may be a gasket leak.
5. Install the glow plugs (see the relevant section).
6. Connect the fuel shut-off solenoid valve connector.