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The purpose of a bearing is to reduce friction, most often on a rotating shaft. It may be made of many different materials including sintered bronze, which holds oil to reduce friction, and various metals which are cast in place to make a soft slippery surface for really heavy shafts. A bearing can also use balls or rods between two hardened metal surfaces, the balls or rollers convert what would be a sliding contact to a rolling point contact.

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Q: What is the function of the main bearings?
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The main bearings are what supports the crankshaft. The rod bearings go on the rod that the pistions are hooked to. Rod bearings are smaller then the main bearings on all engines.


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Depends on the vehicle and which bearings. Wheel bearings, not so expensive. Main bearings inside the engine, expensive.


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