Ford C5AZ-6211-U Bearing - Connecting Rod

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Incorrect bearing installation during engine assembly can lead to bearing failure. Tight fitting bearings leave insufficient bearing oil clearance, resulting in oil starvation. Dirt or foreign particles trapped behind a bearing insert result in high spots on the bearing, which lead to failure.

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). 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.