Mercury XL2Z-6211-FA Bearing - Connecting Rod

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When examining the bearings, they should be removed from the engine block, main bearing caps, connecting rods, and rod caps. They should then be laid out on a clean surface in the same general position as their location in the engine to match any bearing problems with the corresponding crankshaft journal.

When lack of lubrication is the cause of bearing failure, the bearing material is wiped or extruded from the steel backing of the bearing. Temperatures may increase to the point where the steel backing turns blue from overheating.

The best prevention is to clean all parts thoroughly and keep everything spotlessly clean during engine assembly. Frequent and regular engine oil and filter changes are also recommended.

Retaining the old bearings is valuable as they may provide insights into the engine's condition.

It is recommended to replace the main and connecting rod bearings with new ones.

The best prevention is to clean all parts thoroughly and keep everything spotlessly clean during engine assembly. Frequent and regular engine oil and filter changes are also recommended.

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, which produces 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. As the oil is carried to the engine bearings, the acid attacks and corrodes the bearing material.

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