Mercury E63Z-6211-C Connecting Rod Bearing

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

Correcting the root cause of bearing failure is crucial before reassembling the engine to prevent recurrence.

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.

When examining the bearings, remove them from the engine block, the main bearing caps, the connecting rods, and the rod caps, and lay them out on a clean surface in the same general position as their location in the engine. This will enable you to match any bearing problems with the corresponding crankshaft journal.

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

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.

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 of bearing failure, it must be corrected before the engine is reassembled to prevent it from happening again.