Attention.
- Hot engine and oil can cause burns. Be careful not to burn yourself when removing/installing various components.
- Fuel vapors are hazardous and flammable, causing serious injury and equipment damage. Keep sparks and open flames away from fuel.
- Leaks and leaks in fuel lines are dangerous. Fuel can ignite and cause equipment damage, serious injury, or even death. Fuel can cause skin and eye irritation. To prevent this, follow safety precautions when handling fuels and lubricants.
1. Make sure the battery is fully charged. Recharge if necessary.
2. Warm up the engine to normal operating temperature.
3. Perform the procedure for preparing fuel lines for vehicle servicing (see the relevant section of the chapter "Power supply system").
4. Remove the decorative engine cover.
5. Remove the glow plugs.
6. Install the compression gauge:
Install the compression gauge adapter (49 S013 102A) into the glow plug installation hole.
Tighten the compression gauge adapter to a tightening torque of 15-20 Nm.
Connect the compression gauge (49 S010 1A0A) to the adapter (49 5013 102A).
7. Measure the compression in the engine cylinder:
- Press the accelerator pedal all the way down.
- Rotate the engine crankshaft with the starter and measure the compression in the engine cylinder.
Note: Compression (at 180 rpm):
- Standard: 2255 kPa (22.99 kg/cm²)
- Minimum: 1804 kPa (18.40 kg/cm²)
- Maximum difference between cylinders: 147 kPa (1.50 kg/cm²)
Repeat measurements for all engine cylinders.
8. If the measured values are below the minimum permissible values, or the difference between the cylinders exceeds the permissible norm, pour a small amount of engine oil into the engine cylinder through the spark plug hole and repeat the compression measurement:
- If the compression increases after adding engine oil, this indicates wear or damage to the piston rings or cylinder bore. The appropriate repairs must be performed.
- If the compression remains unchanged after adding engine oil, this indicates wear of the valves or a violation of their seating in the seats, as well as a possible leak in the cylinder head gasket. It is necessary to carry out the appropriate repair operations.
9. Remove the compression gauge from the engine.
10. Install glow plugs.
11. Install the decorative engine cover.
12. Clear fault codes from the memory of the electronic control unit using the M-MDS tool.