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Old 06-13-2019, 02:45 PM   #1
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Oil Pressure

Driving down steep grade the other day I crossed some really rough railroad tracks that really jolted the RV. For a very brief second or less I heard a buzzer and saw the red warning light on the oil pressure gauge come on as well as the needle starting to drop.

This lasted less than 1 second.


Oil is up to the full line and never any indication of oil pressure problems before this. No indication of leaks. Oil and filter changed a month ago with less than 200 miles on them.

Is this indicative of a pending problem or can severe sloshing in the oil pan cause this?
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Old 06-13-2019, 04:17 PM   #2
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I would check for a bad or loose wire connection from the oil pressure sending unit to the gauge/light. Get a wiring schematic and check all connections. I doubt itís a real oil pressure issue.

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Old 06-13-2019, 05:27 PM   #3
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I also think the sudden drop in oil pressure was an indication fault rather than an actual oil pressure decline. I would have frt air pressure gage needle bounce from zero to max with alarm buzzer going off on patch of rough pavement. Did it for 12 yrs , till we sold coach. Didn't feel it was worth removing dash cluster to find it.
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Old 06-17-2019, 11:49 PM   #4
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Were you using the engine brake at the time ?

A member with an oil pressure leak , under the rocker cover in the engine brake's mechanism , had a similar oil pressure issue.
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Old 06-18-2019, 05:03 AM   #5
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If the oil pickup is in the front of the engine, rear of the MH, and it was a STEEP grade, the oil pickup could have gulped a bit of air on a hard bump.

I would think it would have to be a pretty steep grade.
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Old 06-18-2019, 05:08 AM   #6
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T in a mechanical oil gauge at the sender, leave it there at a glance you will know if you have good oil pressure.
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Old 06-19-2019, 06:36 AM   #7
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Thanks for all the responses;

Not using the engine Brake
It was a really steep short grade and significant bump.
Like I said earlier the problem lasted less than 1 second and has been fine since.

For now I'm going to chalk it up to indication error from ????? Almost impossible to troubleshoot a problem that isn't acting up while looking for it.

Problems almost never get better on their own so if it is due to other than the steep grade and bump it will get worse and finally declare itself hopefully not leaving me stranded somewhere.
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Old 06-19-2019, 07:19 AM   #8
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Really steep you say...

We had to jamb on the brakes one day so all the oil in the sump sloshed forward (so similar to a steep grade going down, but up probably works too) and we got a low oil warning indication.

I was stopped so I immediately shutdown. (Brain said to shut down before I even thought about what had happened. )

Restarted again and had normal oil pressure again.

Turns out we were a couple quarts low, but that alarm and low oil pressure message startled us.
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Old 06-19-2019, 07:40 AM   #9
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Quote:
We had to jamb on the brakes
that's the one thing I didn't mention in my original post, I was braking fairly hard when it happened.
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Old 06-19-2019, 07:46 AM   #10
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So you were sloshed too 🤣
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Old 06-19-2019, 07:52 AM   #11
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Quote:
Originally Posted by mjeffrey View Post
So you were sloshed too 🤣
Hopefully that's is what I was
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Old 07-09-2019, 04:02 PM   #12
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Problems never fix themselves.

Today on a rough stretch of I 40 in Arkansas all gauges dropped to zero and the red lights and alarms went crazy. Happened several times for a few seconds each.

I am guessing it is a loose or corroded ground.

Has anyone had their instrument panel out?

Are the gauge grounds daisy chained to each other?

Do the gauges all power up when the key is turned on through a common positive?
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