Chevrolet 91177273 Bearing,Connect Rod

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During the engine inspection, it's crucial to retain the old main and connecting rod bearings for examination as they can provide valuable insights into the engine's condition. Bearing failure can result from factors such as inadequate lubrication, foreign particle contamination, engine overloading, and corrosion, all of which must be addressed before reassembling the engine to prevent recurrence. When inspecting the bearings, remove them from their respective locations in the engine block, main bearing caps, connecting rods, and rod caps, arranging them on a clean surface to match any bearing issues with the corresponding crankshaft journal. Foreign particles and dirt can enter the engine through various means, including assembly residue, filter issues, or the PCV system, leading to their embedding in the bearing material, causing scoring or gouging. Proper cleaning and maintenance practices, as well as regular oil and filter changes, are effective prevention measures. Lubrication breakdown, resulting from factors like excessive heat, overloading, oil leakage, or blocked oil passages, can lead to bearing failure characterized by the extrusion of bearing material from the steel backing and overheating. Driving habits, such as full-throttle, low-speed operation and short-trip driving, can also impact bearing life, causing fatigue failure and corrosion. Incorrect bearing installation during engine assembly can lead to oil starvation or the presence of foreign particles behind the bearing insert, causing high spots and eventual failure. When replacing worn or damaged bearings or correcting improper oil clearances, new bearings are essential, especially in a thorough engine rebuild. The correct size bearings can be determined by the automotive machine shop that reconditions the crankshaft, often in increments of 0.010-inch, with markings indicating the amount machined. Plastigage measurements should be the final guide to ensure the right bearing size is selected, and assistance can be sought from the machine shop or dealer parts or service department if there are any uncertainties about bearing selection.