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I posted earlier about my Oil gauge SUDDENLY reading in excess of 60 psi at 1000+ rpm. I was just asked if I had gas in my oil by a mechanic. Is it possible that gas could be getting into my oil ?? If so, could this really be a cause for high oil pressure. I plan on checking the dipstick for the smell of gas as soon as I get home.
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Re: C2 High Oil Pressure revisited
Ralph-----
I see no relationship between gas in the oil and HIGH oil pressure. Oil dilution as a result of gasoline contamination would tend to dilute the oil, causing LOWER oil pressure readings.In Appreciation of John Hinckley -
60 psi would be low for me...
At, say, idle when hot. Normal is pegged above 90. This has been true for 47 years (I am taking my Dad's word for the first 15 or so years). I agree, gasoline contamination would lower the viscosity, lowering the pressure at all engine speeds. After changing the oil, try connecting a reliable mechanical gauge to get a read of the real pressure. Your indicator may be at fault.Comment
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Re: C2 High Oil Pressure revisited
If the oil is hot it will probably evaporate any gas in it. If the oil is cold and the dipstick smells strongly of gas, don't start the car without changing the oil. Believe me - I have the distorted valve covers to prove it.Comment
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Re: C2 High Oil Pressure revisited
I just confirm that my Oil Gauge is correct. I'm getting 60 psi+. Also for what it's worth, I check for the smell of gasoline in the oil at the dipstick, NONE. Could use an oil change though. Is it possible that the oil filter bypass valve at the oil filter could be my problem?Comment
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Re: C2 High Oil Pressure revisited
i would guess if the bypass valve is stuck open you would bypass the filter and the pressue drop accross the filter causing higher oil pressure. that is something easy to checkComment
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Re: C2 High Oil Pressure revisited
Thanks Guys I appreciated your help. It looks like I'm going to drop the oil pan and replacing the pump.Comment
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Re: C2 High Oil Pressure revisited
did you check the oil filter bypass valve in the filter adapter?Comment
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Re: C2 High Oil Pressure revisited
NO Everyone I've spoken too has said it wouldn't cause the high pressure. But now that you reminded me I'll check that first thing. After all it would be the easiest thing to try.Comment
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Re: C2 High Oil Pressure revisited
This is for anyone who has followed this post.
This is from Stegath Coachcraft.
Question: The oil pressure in my '79 Vette's 350 was recently measured at 80psi at 4000rpm. Is that too much? I thought pressure should max out around 65psi. - Rich
Answer: Rich, 80 psi of oil pressure is high for a factory engine, but not for one that somebody rebuilt and put in a high pressure/volume oil pump. 65psi is average for a factory pump.
You didn't say if the engine/oil was cold. Cold, it will go much higher.
Generally the only "problem" high oil pressure will have is higher oil temperature and the oil filter gasket leaking (you'll have to get alot higher to explode the oil filter). It could also cause the oil filter by-pass to open when the engine is cold. This would let unfiltered oil go through the engine (this happens anyway, so don't get excited about it.) In theory, many other problems could develop but are unlikely.
If you know the history of the engine and suddenly the oil pressure went up, then it sounds like the oil pressure relief valve in the oil pump may be stuck. It might be fixed with something as simple as an oil change.
I wouldn't be concerned about it unless it suddenly started acting this way and an oil change doesn't fix it. If it keeps going higher and higher then the only solution is to change the oil pump.
I am please to tell you I changed the oil and the High Oil Pressure problem was cured. I was very surprised. I would have expected that with old thin oil that I would have had lower oil pressure. By simply changing the oil it appears everything is back to normal.Comment
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