Engine Bearings - Enable Moving Parts To Spin Freely In The Engine
Engine Bearings – Enable Moving Parts To Spin Freely In The Engine

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Engine Bearing Clearance – Can Cause Early Failures If Not Correct

Crankshaft Thrust Bearing Failure – Causes And Remedies

Oil Consumption Past Rings – Worn Bearings Can Make It Worse

Engine Bearing Replacement – Learn How To Replace

Engine Bearing – Function – Failure Symptoms – Causes And Prevention


Bearings should always be replaced; when you are rebuilding an engine. Consequently, Heat, pressure, chemical attack, abrasion and loss of lubrication; can all contribute to deterioration. So, All bearings will show some degree of wear. But, A close examination of the old bearings may reveal other problems.

Main Bearings

The main bearings are located in the engine block. The main bearing sits inside the main bearing housings that hold the crankshaft. One bearing is located in the engine block; and the other in the main cap. Main bearings may have certain characteristics such as oil holes; locating tags and oil grooves.

Con-rod Bearings

So, Connecting rod bearings provide rotating motion; of the crank pin within the connecting rod. The connecting rod bearing; sits inside the big end of the connecting rod.

Thrust Washers

So, Thrust washers are either separate from the main bearing; or integrated into the one or two of the main shells. Consequently, The thrust washers control the; front to back movement of the crankshaft.

Cam Bearings

So, The cam bearings sit between the cylinder head casting; and the camshaft caps that house the camshaft. Consequently, These bearings may have oil holes; for certain engines to help keep the camshaft lubricated.

Pin Bushings

So, Pin bushings are commonly called small end bushings. They provide relative motion of the piston from the connecting rod. Also, the small end of the rod is where the bushings are.

As long as there’s a steady flow of clean oil; the bearings will generally keep moving along fine. If the oil’s dirty, though, or if the supply is cut off; that’s when the problems start. Bearing lubrication is critical from the second the engine turns over until it is shut down.

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