Ford F9AZ-6211-AA Bearing - Connecting Rod

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During an engine overhaul, it is recommended to replace the main and connecting rod bearings with new ones; however, retaining the old bearings for close examination is valuable as they may provide insights into the engine's condition. Bearing failure can result from factors such as insufficient lubrication, the presence of dirt or foreign particles, engine overloading, and corrosion. Correcting the root cause of bearing failure is crucial before reassembling the engine to prevent recurrence. When inspecting the bearings, remove them from the engine block, main bearing caps, connecting rods, and rod caps, arranging them in a corresponding position to their location in the engine. Foreign particles, including metal chips and abrasives, may embed in the bearing material, leading to recognizable damage. Thorough cleaning during assembly and regular oil and filter changes are preventive measures. Lack of lubrication, caused by factors like excessive heat, overloading, oil leakage, or blocked oil passages, can result in bearing material breakdown. Driving habits, such as full-throttle, low-speed operation and short trips, affect bearing life by inducing high loads, flexing, and corrosion. Incorrect bearing installation during assembly, with tight-fitting or improperly placed bearings, can lead to oil starvation and failure.