Name: ISDe engine crankshaft main bearing 3925921
Brand: Renman
Availability: InStock

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ISDe engine crankshaft main bearing 3925921

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What is a main bearing?

In a piston engine, the main bearings are the bearings on which the crankshaft rotates, usually plain or journal bearings. The bearings hold the crankshaft in place and prevent the forces created by the
piston and transmitted to the crankshaft by the connecting rods from dislodging the crankshaft, instead forcing the crank to convert the reciprocating movement into rotation. Most modern automotive engines have one main bearing at each end of the crankshaft and another in between each adjacent pair of connecting rod journals, but not all engines conform to this generalization. Notable exceptions include the Ford flathead V-8, which often had only three main bearings, and straight-6 engine, which had in various iterations, between 3 and 7 main bearings.

Symptoms of Faulty Engine Bearings
Problems with engine bearings will usually result in some sort of knocking noise coming from your engine. The type of knocking noise that you hear will use the usually give you a good idea of which engine bearing is faulty or needs to be replaced.

Bad main bearing sounds. If you hear knocking sounds when you start your car that continue while the engine is running, and the sound is coupled with low oil pressure warnings, this is a good indicator that your engine has bad main bearings.
Faulty rod bearing sounds. If the knocking noise sounds more akin to striking a piece of tin or aluminum and increases in intensity as you accelerate, the most likely culprit is a faulty rod bearing.

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