Does Engine Bearing Seizure Require Overhaul?

[ZaneFitz]

Engine bearing seizure requires an overhaul. The big and small bearings on the pistons, after oil leakage and without oil lubrication, continue to operate, causing the crankshaft bearings to stick to the cylinder block and the piston bearings to stick to the crankshaft. Without oil lubrication between the bearings and the crankshaft, as well as between the bearings and the pistons, bearing seizure occurs, necessitating an overhaul. Common causes of engine bearing seizure are as follows: 1. Bearing issues: Poor quality of the crankshaft and bearings, and poor smoothness of the journal and bearings, especially in vehicles that have had bearing replacements during major overhauls. 2. Installation problems: Incorrect installation of big and small bearings, or improper adjustment of clearance. 3. Wear issues: Severe wear and failure of the oil pump gears, leading to reduced oil supply pressure and difficulty in delivering oil to the designated lubrication points, resulting in dry friction of the bearings. 4. Blockage problems: The oil passages are clogged with impurities, obstructing the oil flow to the crankshaft and causing dry friction of the bearings. 5. Leakage problems: Oil pipeline leaks cause a drop in the oil circulation supply system pressure, making it difficult to supply oil to the designated lubrication points, leading to dry friction of the bearings. 6. Sudden throttle acceleration: Rapidly pressing the throttle during a cold start when the oil is still thick and has not been pumped to the bearings can cause instantaneous high temperatures on the bearing surfaces, leading to metal fusion.