Mercury E63Z-6211-D Bearing - Connecting Rod

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Excessive heat (which thins the oil), overloading (which squeezes the oil from the bearing face), and oil leakage or throw off (from excessive bearing clearances, worn oil pump, or high engine speeds) all contribute to lubrication breakdown. Blocked oil passages, usually the result of misaligned oil holes in a bearing shell, will also oil starve a bearing and destroy it.

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

Foreign particles, including metal chips and abrasives, can embed in the bearing material and cause damage.

Bearing failure occurs because of lack of lubrication, the presence of dirt or other foreign particles, overloading the engine, and corrosion. Regardless of the cause, it must be corrected before the engine is reassembled to prevent it from happening again.

Dirt and other foreign particles get into the engine in a variety of ways. It may be left in the engine during assembly, or it may pass through filters or the PCV system. It may get into the oil, and from there into the bearings. Metal chips from machining operations and normal engine wear are often present. Abrasives are sometimes left in engine components after reconditioning, especially when parts are not thoroughly cleaned using the proper cleaning methods. Whatever the source, these foreign objects often end up embedded in the soft bearing material and are easily recognized. Large particles will not embed in the bearing and will score or gouge the bearing and journal. The best prevention for this cause of bearing failure 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.

Lack of lubrication, caused by factors like excessive heat, overloading, oil leakage, or blocked oil passages, can cause bearing material breakdown.

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.