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Old 04-14-2003, 07:02 PM
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Join Date: Apr 2003
Location: chicago
Posts: 10
Question check valve, relief valve...

Hello everyone. Sorry for this stupid question but... I have been pouring through searches on t-chains & oil pressure check valves, was wondering if the op check valve is the op relief value...

pretty good dumb question, huh?
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Old 04-14-2003, 08:48 PM
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smoke gets in your eyes
Join Date: Jun 2000
Location: SF Bay Area
Posts: 18,745
In the general sense a check valve allows flow in only one direction. In the context of MB lubrication systems, the anti-drain valve in/near the oil filter keeps oil in the upper engine after the engine is shut down so it's primed when you restart. There might be other check valves.

A relief valve prevents flow until a determined pressure threshold is achieved at which point it opens to allow flow. In the context of many lubrication systems (including MB?), there's a relief valve before the oil filter such that if the oil filter gets clogged oil can bypass the filter ensuring some if not the cleanest oil gets where it should. The oil pressure gauge is not in the bypass loop. There might be other relief valves.

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