Mercury 6M8Z-6211-C Bearing - Connecting Rod

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Dirt and foreign particles can enter the engine during assembly, pass through filters or the PCV system, or get into the oil. Metal chips from machining operations and normal engine wear are also common. Abrasives may remain in engine components after reconditioning if not cleaned properly. These foreign objects can become embedded in the soft bearing material, while larger particles may score or gouge the bearing and journal.

Driving habits can have a definite effect on bearing life. Full throttle, low-speed operation (lugging the engine) puts very high loads on bearings, which tends to squeeze out the oil film. These loads cause the bearings to flex, producing fine cracks in the bearing face (fatigue failure). Eventually, the bearing material will loosen in pieces and tear away from the steel backing. Short trip driving leads to corrosion of bearings because insufficient engine heat is produced to drive off the condensed water and corrosive gases. These products collect in the engine oil, forming acid and sludge, which attacks and corrodes the bearing material.