Lincoln D2RY-6211-C Bearing - Connecting Rod

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Lack of lubrication (or lubrication breakdown) has a number of interrelated causes, including 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). Blocked oil passages, usually the result of misaligned oil holes in a bearing shell, will also oil starve a bearing and destroy it.

Incorrect bearing installation can lead to bearing failure. Tight-fitting bearings may leave insufficient oil clearance, resulting in oil starvation. Additionally, dirt or foreign particles trapped behind a bearing insert can create high spots on the bearing, leading to failure.

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.

Thorough cleaning during assembly and regular oil and filter changes are preventive measures to avoid bearing failure.

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

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.

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 (or lubrication breakdown) has a number of interrelated causes. 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, which usually are the result of misaligned oil holes in a bearing shell, will also oil starve a bearing and destroy it. 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.