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Old 08-09-2017, 03:54 PM   #1
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Default Oil pressure sensor

Fresh off a bottom/running gear scrape, got the boat up on plane, trimmed out and running just fine - bumping up RPMs about 200-300 RPMs at a time up to 2,600 RPM, just under 20 knots.

Everything going fine for about three minutes when port engine alarms. Temperature fine at 175F - same as starboard - but showing 0 PSI on oil pressure gauge. Did not look/don't remember what volt meter read.

Secured port engine and dropped starboard to idle. Starboard still running fine, good temperature, oil pressure and voltage.

Physically examined port engine, no oil leaks, no oil in the bilge, and no odors. Checked oil level - towards the lower middle of the range, but hey, there's more oil up in the engine then pre-underway check when most of it is down in the pan.

Started port engine, good temps, oil pressure and alternator. Brought RPMs up about 200 RPMs at at time, sat and waited and then advanced up another 200 RPM. Matching with starboard to keep everything balanced.

Temperature, oil pressure and charging going fine up to and including 1,400 RPM. When pushing above 1,500 RPM oil pressure gauge started to swing wildly back and forth between 0 and 40 PSI for a few seconds, then droped to a solid 0 PSI. Backed the engine down to 1,400 RPM, oil pressure came back up to 40 PSI. Also saw some fluctuation in the port volt meter at the same time the oil pressure gauge was flipping back and forth.

Port engine ran fine rest of day (hour plus) - post mooring inspection in the engine room again showed nothing out of the ordinary.

Hoping just a faulty oil pressure sensor - thoughts/ideas .. .things to check/try?
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Old 08-09-2017, 10:37 PM   #2
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Since both oil gauge and alarm sounded witch is two separate senseders it sound like a real problem. My thoughts its the pressure relief valve in the oil pump opening prematurely.
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Old 08-10-2017, 03:05 AM   #3
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@mmwjr - shouldn't there be some oil spray from an open relief valve? Didn't see anything when we were underway, but didn't get too up close and personal since it was hot. Will crawl around and look harder next time on board.
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Old 08-10-2017, 03:07 AM   #4
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Quote:
Originally Posted by PJHoffnet View Post
@mmwjr - shouldn't there be some oil spray from an open relief valve? Didn't see anything when we were underway, but didn't get too up close and personal since it was hot. Will crawl around and look harder next time on board.
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The oil pumps relieve valve pass oil back into the oil pan so no you will not see any.
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