Why would oil pressure get higher?

[Geoff C.]

[Joe L.]

Re: Why would oil pressure get higher?

Geoffrey-----

I would expect a "hot-and-running" oil pressure of about 45 PSI for your engine. If, indeed, that's what it was, but it's now as you described, then I expect that the most probable culprit would be a sticking oil pressure relief valve (in the oil pump). The valve consists of a "piston" and a spring. Sometimes the "piston" can fit too tight in the bore in the oil pump cover and consequently stick or bind.

[Terry F.]

Re: Why would oil pressure get higher?

I think a spun bearing might do the same. Launching can cause this to happen. But, I think you would start to hear it soon enough, maybe not. Not an engine expert.

Terry

[Tom H.]

Re: Why would oil pressure get higher?

Have you tried a direct oil pressure gauge to be sure you are getting a correct reading on your in car gauge?

[Dale S.]

Re: Why would oil pressure get higher?

Before they staryed putting a bypass in the filter we saw this problem. That was one of the problems they had. I went on a few warranty calls for Fram in early 1960's on ther first Ph-8. They added the PH-8A which had the built in bypass.. I saw some that were bulged out and blown off. Filters now have the by pass. Dale

[Geoff C.]

[Rick S.]

Re: Why would oil pressure get higher?

Geoff, not to hijack your post but I have a similar question. I have a a 67 327/350hp (L-79) and my guage would indicate under 30 after warm up. I replaced the copper line and now the guage pegs at 60 all the time. Does anyone have any suggestions.
Regards,
Rick
P.S. Mine also returns to zero at shut off.

[Gerard F.]

How about an earl and filter change,

Geoffrey. As they would say in the Bronx, ----or Brooklyn.

Why get complicated.

Queens Boy

Jerry Fuccillo
#42179

[Joe L.]

Re: Why would oil pressure get higher?

Geoffrey------

I'm not too big of a believer in "chemical repair agents". However, I don't think that most of them will do much harm. So, it might be worth a try.

One thought here: if the engine in this car has gone a long while between starting, it may be that all of the oil "departed" the oil pump surfaces. If only the slightest amount of corrosion formed in the oil pump pressure relieve valve piston, that would be enough to cause it too stick.

[Geoff C.]

[Mike M.]

Re: Why would oil pressure get higher?

Jiffy Lube? near sacrelegious. get off the couch, put away the Frito lays and change the oil and filter yer self. regards, mike

[Geoff C.]

Help, I've fallen & my ambition got broke *NM*

[Gerard F.]

A Propensity for Joking Around

Learned that at CCNY, Geoffrey.

Try that diesel 15W40 C1-4 plus. Just works great in my 67 S/B.

Jerry Fuccillo
#42179

[Clem Z.]

make sure the oil filter bypass valve in the

oil filter adapter is still in place when you change the oil filter

[Chuck S.]

Re: Why would oil pressure get higher?

When was your last oil change, and, er...who did it...Lube N' Go? Any chance they could have slipped some 40W oil in by mistake?

With the temperatures beginning to drop, this sounds more like high oil viscosity. I have exactly the same behavior on my 2006 in the fall/winter if I get on it before the oil temp is above about 150 deg...and it's running 5W-30. Right after start up, oil pressure is about 45 at idle, over 70 at 2500-3000rpm...consequently my driver info read-out stays set on engine oil temp now.