2. Disconnect the connectors from the injectors.
3. Remove all glow plugs.
4. Close the nozzle holes with a clean rag and after turning the crankshaft with a starter, check for foreign particles on them.
Attention! Keep clear of the injector holes while cranking the crankshaft with the starter.
Attention! If, during the compression test, the cylinder is (as a result of cracks) coolant, oil, fuel, etc., they will heat up and splash out of the hole under pressure, which is very dangerous.
5. Install and secure a compression gauge for measuring compression in diesel engines.
6. Turning the crankshaft of the engine with a starter, measure the compression in each cylinder, which must be at least 2000 kPa.
7. After measuring the compression in all cylinders, check that the compression difference between the cylinders does not exceed 400 kPa.
8. If in any cylinder the compression exceeds the maximum allowable value or the difference in compression between the cylinders exceeds the maximum allowable value, then pour a little engine oil into the nozzle hole of this cylinder and repeat the measurements.
9. If the compression increased after oil filling, then the causes of the malfunction are wear or damage to the piston ring and / or cylinder mirror.
10. If the compression does not increase after filling with oil, it means that the valve seat is burnt or damaged or there is a gas leak (pressure) through the cylinder head gasket.
11. Remove the compression gauge.
12. Install glow plugs.
13. Connect the injector connectors.