Symptom | Cause of failure | Remedy |
Knocking when starting a cold engine, which then stops | Normal phenomenon | The knocking stops as soon as the oil pressure reaches normal values |
Knocking for a long time when starting the engine that has not been running for 48 hours or more | Leakage of oil from the pressure chamber of the pushers and the ingress of air into it | Knocking should stop within 15 minutes when the engine is running at a speed of 2000-3000 min-1 |
Constant knocking when starting the engine for the first time after assembling the cylinder head | Insufficient oil supply to the oil line of the cylinder head | Ensure normal oil supply to the oil line of the cylinder head |
Constant knocking while the engine is running after it has been cranked for a long time by the starter or by the wheel | Leakage of oil from the pressure chamber of the pushers and the ingress of air into it | Ensure proper oil supply |
Constant knocking when the engine is running after replacing the pushers | Insufficient oil supply to pushrods | Ensure proper oil supply |
Constant knocking at idle after running the engine at a high speed of the crankshaft | Engine oil level too high or too low Entry of large amounts of air into the oil when the engine is running at a high engine speed Deterioration of oil quality | Check the oil level and, if necessary, restore it to normal Check lubrication system Check oil quality |
Knocking when the engine is running for 15 minutes or more | Reduced oil pressure Pusher failure | Check oil pressure and oil supply to all engine components Remove the cylinder head cover and check that the pushrod plungers move when pressed with a finger. If the plunger moves, replace the plunger |