Lubrication System Function

     The lubricating oil performs the following functions in an engine：

    ·The oil lubricates moving parts to minimize wear by sealing the clearances betweenmoving parts such as bearings, shafts, etc. Thus，the parts move on layers of oil,and not in direct contact with each other, which reduces power loss in the engine.

    ·The oil obtains heat from the moving parts of the engine which is transferred intothe cooler oil in the oil pan. Therefore, the oil performs the function of a coolingagent. Some engines have oil nozzles which spray oil at the underside of thepistons，thereby removing heat from the pistons.

    ·The oil fills the clearances between rotating journals and the bearings.  Whenheavy loads are abruptly placed on the bearings, the oil acts as a cushioning agent,which reduces the wear on bearings.

    ·The oil creates a seal between the walls of the cylinder and the piston rings,thereby reducing exhaust gas blowby.

    ·The oil performs the function of acleaning agent by picking up dirt particles and taking them to oil pan. Larger particles are retained at the bottom while smallerparticles are filtered out by oil filters.

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