The engine bearing is the parts that are used to reduce friction between the surfaces under the influence of rotation in the engine, to keep the engine parts in the correct position and to increase the lifetime of the surfaces on which they are attached, and have the feature of renewal. Aluminum-tin, copper-tin-lead, aluminum-tin-silicon, white metal, aluminum, lead-free bearings are available in various alloy types.

Replacement of parts such as crankshaft and camshaft takes a long time and financially costly operations. Bearing parts collect friction-induced wear on itself, significantly increasing the service life of other parts. 

In addition, the replacement of these parts is very easy compared to other built-in parts, but the oil duration, amount and oil quality are important to keep the bearing life as long as possible.

The bearings are called with different names depending on the bearing types and their location.

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