Q: replacing crankshaft

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what will be the cause of damage crankshaft

Crankshaft damage can occur for a few reasons. One can be from the engine running hot or overheating. Proper cooling system operation is important. Lubrication is another. If the oil level is run low or oil changes not being done according to the vehicle’s recommended schedule, the crankshaft can get scored, or even overheat. Another related item could be low oil pressure. If the oil pump is weak or if the engine has very high mileage, oil pressure can drop. Just like running hot, consistently low oil pressure and levels will cause extensive engine damage.

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