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  #11  
Old 10-01-2018, 02:06 PM
Rumbleguts396 Rumbleguts396 is offline
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My 1969 corvette 427/390 is around 35-40 when warmed up. It’s has 3:08 gears. Rob
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Old 10-01-2018, 05:14 PM
earntaz earntaz is offline
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If it is an electric gauge, make sure the lead is not grounding out somewhere ... I think if the lead is grounded ... the gauge will indicate max pressure. If I am wrong -- someone chime in ... TAZ
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Old 10-01-2018, 07:12 PM
Dave Rifkin Dave Rifkin is offline
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The gauge is a mechanical unit.
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Old 10-05-2018, 02:08 AM
Dave Rifkin Dave Rifkin is offline
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Quote:
Originally Posted by TWB View Post
The 68-73 corvette oil gauge is very susceptible to corrosion at the pivot points. Can be fixed. Not a problem. If you are willing to pull it out send a PM and I will get you through it.
Sent you a PM regarding the rebuilding / clean-up of the pivot points.
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Old 01-13-2019, 03:33 PM
Dave Rifkin Dave Rifkin is offline
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Finally got around to removing the oil pressure gauge; can anyone here help guide me through the steps needed to get it working properly again? Nothing about the gauge seems broken, I can move the needle very easily and it doesn't seem to stick at all.

Of course that makes me think it's something more serious...............ugh.

Last edited by Dave Rifkin; 01-13-2019 at 08:33 PM. Reason: added details
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Old 01-22-2019, 03:08 PM
Flying Undertaker Flying Undertaker is offline
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Default Oil pressure pegged

Try looking at the oil filter bypass valve above the oil filter, maybe the bypass valve is clogged or stuck shut thereby raising the oil pressure, just a thought, without pulling the engine. Don.
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Old 01-22-2019, 03:17 PM
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big gear head big gear head is offline
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The bypass is only supposed to open when the oil filter is clogged.
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Old 01-22-2019, 03:52 PM
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'

Have you tested actual pressure w/ a remote gauge yet also how long has the engine been operating normally - any recent rebuild etc?
Info supplied so far sounds like it may be the pressure relief valve in the pump as Bill mentioned at the beginning?
So, best test before going in other directions and good luck w/ everything!

~ Pete

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Last edited by PeteLeathersac; 01-22-2019 at 03:57 PM.
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Old 01-22-2019, 04:09 PM
Flying Undertaker Flying Undertaker is offline
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Default Oil pressure pegged

The oil pressure bypass valve also opens when the engine oil is cold so that the oil filter will not expand. Racers have been plugging off this bypass valve opening for years but are cautious about revving the engine when cold to prevent oil filter damage. When the engine is totally warmed up is the oil pressure still pegged? If so I'd check the oil pump pressure spring, cup and relief valve in the oil pump. If pressure goes up there is a restriction somewhere. Doesn't cost anything to check it out. Just my 2 cents worth. Don.
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Old 01-22-2019, 10:37 PM
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Quote:
Originally Posted by big gear head View Post
The bypass is only supposed to open when the oil filter is clogged.
Not true. At least with sbc & bbc. The bypass valve (BV) opens @ 17-18 lbs of pressure. The engine, while running, is constantly by-passing oil from the filter. In other words, while the engine is running, a % of unfiltered oil is always going through an engine. It was designed that way and that bypass should never be plugged. The engineers that designed the oiling system felt it was better to have some dirty oil, than no oil at all.
Back to the OP. There are only 3 causes of pegged oil pressure I am aware of 1) defective gauge- get another gauge and test to rule out gauge 2) stuck pressure relief valve in oil pump- remove pump repair or replace ( 2nd option preferable) 3) oil galleys plugged with foreign matter-tear down engine.
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