Compression test
Note: In case of loss of power, increased fuel consumption or increased oil consumption, it is necessary to check the compression in the engine cylinders.
1. Warm up and stop the engine. Warm up the engine to normal operating temperature (80-95°С).
2. Disconnect the inlet (A) and graduation (IN) fuel lines from the fuel filter.
3. Rotate the crankshaft to release fuel from the high pressure pump.
Note: Collect residual fuel by placing the return hose in a suitable container.
4. Disconnect the high pressure fuel line and remove the injector and washer.
5. Measure the compression pressure in the cylinder:
Install special tool (09351-27000, 09351-1M100) into the nozzle hole.
Measure the pressure by turning the crankshaft.
Note: Use a fully charged battery to crank the engine at 200 rpm or more.
Repeat the above steps for each cylinder.
Attention. This work should be done in the shortest possible time.
Note:
- Compression pressure rating: 2157.45kPa (22 kg/cm2) (at 200 rpm).
- Minimum compression pressure value: 1863.25 kPa (19 kg/cm2).
- The difference between the compression of each of the cylinders: no more than 294.2 kPa (3 kg/cm2).
If one or more cylinders are below the limit, add some engine oil to the cylinder injectors, repeat steps 1 and 2, and remeasure the compression pressure.
If the remeasured pressure becomes higher, wear or damage to the piston ring or cylinder surface may be the cause.
If the remeasured pressure does not get higher, the cause may be damaged valve seats or the valve does not seat properly. Damage to the cylinder head gasket may also be a possible cause.
6. Install injectors, washers and connect high pressure fuel line.
7. Connect the inlet and outlet hoses to the fuel filter.