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post #1 of Old 07-14-2013 Thread Starter
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Yanmar Oil Pressure Pegged

I have a 1992 Yanmar 3GM30F motor with ~670 h on it. The past few times I have fired it up, the oil pressure gauge pegs around 85 psi for about 5 minutes then drops to ~50 PSI (mid gauge). Throttle up and the pressure rises some (10 PSI).

Oil level is fine, changed filter at end of last season on the hard. I don't think it is the gauge or pressure sensor since they do end up operating once the oil/motor warm up. My gut feel is it it is the oil pressure relief valve unit.

Next w/e I will change the oil filter again to see it is a plugged filter (doubt it). If I have to change the oil pressure relief valve, is this a simple job? Is the piece costly? It's located in the Oil Filter house base, correct?

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