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An oil pump is a pump designed to supply pressurised oil to a closed system.
Additional recommended knowledge
Internal combustion engines
In an internal combustion engine, the oil pump is usually a gear pump driven by the camshaft or crankshaft.  Oil pressure varies quite a bit during operation, with lower temperature and higher RPM's increasing pressure. To ensure that the oil pressure doesn't exceed the rated maximum, a spring-loaded pressure relief valve routes oil back to its source once pressure exceeds a preset limit. 
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Oil_pump". A list of authors is available in Wikipedia.|