Mercury C2OZ-6211-R Bearing - Connecting Rod

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To say the least, when reconditioning an engine, it is required to use new main and connecting rod bearings although the old ones should be retained for serious examination as these will give a clue on the engine. Causes of bearing failure include lack of lubrication, contaminants such as dirt or particles, overworking the engine, and corrosion and such problems must not be overlooked while disassembling but fixed to avoid being repeated. When inspecting the bearings, they should be pulled out of the engine block and spread on a flat surface in their original position in order that problems be matched with the crankshaft journal. Foreign particles can be got into the engine during assembly, in passing through the filter or through the PCV system or from tramp metals and abrasive from the machining or after reconditioning. Contaminants can be incorporated into the bearing metal matrix, while undergone material resulting in scoring or gouging can result from the large size particles. Thus, to avoid such failures, cleaning of all parts and routine engine oil and filter should be done. Failure of greasing can be consequent of high temperatures, overloading, leaking or choked oil channels which may cause serious damage such as extrusion of bearing surface material right from its metal jacket. Other dynamic considerations also greatly influence bearing life; when a vehicle is raced at low speeds, high loads are obtainable that can push out the oil film whereas short distance travel can cause corrosion because of inadequate heat build up. Also, wrong orientation of bearings can lead to oil starvation because they may be pressed in tightly or because of dirt, debris and gunk trapped behind inserts leading to high spot fatigue failure.

At anytime an engine is overhauled it becomes necessary to replace main and connecting rod bearings while retaining the old ones as they can tell a lot about the engine. General causes of bearing failure include inadequate lubrication, polluted lubricants, overloading, and corrosion and all these must be corrected before the bearings can be reused. When examining the bearings, they need to be unloaded from their place and placed on a clean surface so that it may be easy to match the defects with the crankshaft journal. These particles can get into the engine when the engine is being assembled, with the filter or during the course of machining for they can penetrate deep into the bearing material and remain therein, while the larger ones cause scoring. It is from such failures that one can chose to emphasize the need for cleaning every part of the vehicle and following recommended times for oil change and filter replacement. The main causes include excess temperature, overcharge, oil loss, or blocked oil supply passages, with severe effect in that the bearing material is scraped off. Some driving behavior also affect bearing years; for example, maneuvering at slow speeds puts full throttle which can generate loads that expel oil and short trips result to corrosion. Also, improper installation like backlash of tight-fitting bearing or foreign objects trapped within can lead to oil starvation, and therefore failure.

To say the least, when reconditioning an engine, it is required to use new main and connecting rod bearings although the old ones should be retained for serious examination as these will give a clue on the engine. Causes of bearing failure include lack of lubrication, contaminants such as dirt or particles, overworking the engine, and corrosion and such problems must not be overlooked while disassembling but fixed to avoid being repeated. When inspecting the bearings, they should be pulled out of the engine block and spread on a flat surface in their original position in order that problems be matched with the crankshaft journal. Foreign particles can be got into the engine during assembly, in passing through the filter or through the PCV system or from tramp metals and abrasive from the machining or after reconditioning. Contaminants can be incorporated into the bearing metal matrix, while undergone material resulting in scoring or gouging can result from the large size particles. Thus, to avoid such failures, cleaning of all parts and routine engine oil and filter should be done. Failure of greasing can be consequent of high temperatures, overloading, leaking or choked oil channels which may cause serious damage such as extrusion of bearing surface material right from its metal jacket. Other dynamic considerations also greatly influence bearing life; when a vehicle is raced at low speeds, high loads are obtainable that can push out the oil film whereas short distance travel can cause corrosion because of inadequate heat build up. Also, wrong orientation of bearings can lead to oil starvation because they may be pressed in tightly or because of dirt, debris and gunk trapped behind inserts leading to high spot fatigue failure.

When doing an engine overhaul it is common to remove the main and connecting rod bearings and replace them with new ones while the old ones are used for analysis. Some of the causes of bearing failure include; inadequate lubrication, dirt accumulation, overloading, and corrosion, any one of which has to be treated before reassembling the engine, otherwise, it will recur. On the latter, bearings should be taken out of their positions and arranged on a flat surface to align any defects that may be on the crankshaft journal. Contaminants may be introduced to the engine during: assembly, filter, PCV system and; often may be metal chips and abrasives that are used during machining or reconditioning of the engine. Larger Foreign Particles can get lodged in the bearing material surface, and huge particles may cause scoring or gouging of the bearing material surface. That is why proper washing of all components and oil and filter replacement are so important in order to avoid such failures. Where no lubricant is available the reasons may include: high temperatures, overloading, leakage of oil, blocked oil supplies,where bearing metal is removed and the backing gets to overheat. Common traversing behaviors are also very influential in bearing duration; for example, low-speed racing generates high loads that expel the oil while short excursions are eradicative because the heat cannot expunge moisture and gases. Also, when bearings are wrongly positioned, it can lead to oil starvation or there tends to be formation of high spots which lead to failure.

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). Blocked oil passages, usually the result of misaligned oil holes in a bearing shell, will also oil starve a bearing and destroy it.

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

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

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.

When inspecting the bearings, they should be removed from the engine block, main bearing caps, connecting rods, and rod caps, and arranged in a corresponding position to their location in the engine.

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.