Pontiac 12523924 Bearing Kit,Connect Rod

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In an engine rebuild it is appropriate that new bearings to be fitted for the main and the connecting rods while the worn out bearings are kept as they offer the necessary information of the state of the engine. The primary causes of bearing failure are as follows: lack of adequate lubrication, contaminants such as dirt and foreign particles, overload on the engine and corrosion which call for rectification of the cause before reassembly of the bearing to avoid similar fate. When inspecting bearings, they should be taken off the engine parts and placed on a flat surface in positions that match the positions of crankshaft journal to which the bearings will be matched in case of detection of some problems. Contaminents may be carried in during assembly, with the intake air, or by machining operations and become lodged or imbedded in the bearing surface, while larger sized contaminents have the potential of scoring or gouging. To avoid such failures one has to ensure that all parts are cleaned and the oil, filter changed as often as possible. This can cause lubrication breakdown through such as excess heat, overloading, leakage or in case of blockage of oil passages to affect adversely the severe areas where bearing material is worn off and temperatures go high. Another thing is that driving patterns also have an effect to the bearing life; for example constant low-speed projection with full throttle stresses the bearing to the point that oil is squeezed out, while short trips increase corrosion due to lack of sufficient heat. Also, random positioning of bearings leads to oil starvation or high spots that lead to the failure of bearings.

The piston assembly should be pushed into the bore using a wooden hammer handle to tap the top of the piston slightly, while holding the ring compressor solidly against the cylinder block until all rings are inside the bore.

To check for an out-of-round condition: 1. Remove the Plastigage carefully. 2. Rotate the crankshaft 90 degrees. 3. Recheck the clearances with Plastigage and compare these measurements to the previous ones to assess eccentricity.

Use a ridge reamer to eliminate the ridge or carbon deposits at the top of each cylinder, working on one cylinder at a time.

To prevent future occurrences of bearing failure.

Tighten the piston ring compressor until the rings are flush with the piston surface before pushing the piston assembly into the bore, using a wooden hammer handle to tap the top of the piston slightly if needed.

Inspect the connecting rods and caps for cylinder identification, marking them with a small punch if necessary.

Bearing clearances must be checked whenever an engine is overhauled, applicable to both reused and new bearings.

Excessive heat, overloading, oil leakage or throw off, and blocked oil passages.