Lubrication SystemThe crankshaft and camshaft rotate at speeds up to several thousand revolutions per minute (rpm). Valves and pistons accelerate at tremendous rates, abruptly changing direction between velocities of hundreds of feet per second. In order to endure these harsh conditions, the parts are manufactured to exact dimensions, assembled with precision clearances, and lubricated by a pressurized oiling system. An engine-driven oil pump supplies oil under pressure to the engine where it is routed through a network of small passages which deliver it to each critical bearing surface. A filter to clean the oil and a system to warn the driver of low oil pressure are part of the oil system. A secondary function of the oil in the lubrication system is to help carry away excess heat, and some lubrication systems contain an oil cooler for reducing oil temperature before it is recirculated back to the engine. More information on the lubrication system is found in ENGINE. For information on oil and oil filter replacement intervals, see LUBRICATION AND MAINTENANCE. |
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