- Insufficient lubrication due to low oil level.
- Water in engine oil as a result of a defective cylinder head gasket.
- RPM too high with cold engine and therefore oil too viscous
- Broken lubricant film at high oil temperatures; Possibly due to the wrong viscosity of the oil.
Measures for damaged bearings
We warn you in advance - almost always a defect occurs in the plain bearings of the connecting rods. Very rarely it is found in crankshaft main bearings.
Bearing damage usually means extensive engine repairs. But if you recognize a defective connecting rod bearing at an early stage, it may be sufficient to replace the bearing. That's why:
- If there is a hard knock in the engine compartment, immediately turn off the engine. The oil pressure warning light also comes on frequently.
The engine crankcase includes the following parts:
1 - mesh oil filter with suction snorkel;
2 - suction tube bracket;
3 - gasket;
4 - crankcase;
5 - oil drain plug.
The photo shows the engine and gearbox mount on the front left. Support (3) gearbox is supported by a hydraulic damping block (2) engine on the body of the front axle (1).
- Don't start the engine again, have the car towed to a workshop.
- If the engine has run less than 100,000 km, then a partial repair may be sufficient
- Let them dismantle the crankcase and unscrew the covers from all the connecting rod bearings.
- If only individual bearing shells are damaged and the crankshaft journals are still smooth, it is sufficient to replace only the bearing shells.
- Adhering bearing material, if any, must be removed from the crankshaft trunnions.
- In any case, have the connecting rod bore with the defective bearing measured. Most often, the connecting rod hole needs to be bored - a job for an engine repair shop.
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