Oil Pressure for my 304 pegs the guage 80+ psi ?? - JeepForum.com
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Unread 10-07-2013, 09:28 AM   #1
myridge
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1979 CJ7 
 
Join Date: May 2008
Location: Eureka, MO
Posts: 65
Oil Pressure for my 304 pegs the guage 80+ psi ??

I put my CJ7 back together after 5 years of sitting in pieces in my garage and when I fired it up it pegs the gauge at 80+ psi, When I turn the ignition on it zeros out then once running it pegs. I am not complaining if its high higher is better than lower but can I trust it?

Its wired to using the solid purple wire to the sensor.

1979 cj7 304, TH400, Quadratrac

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Unread 10-07-2013, 10:06 AM   #2
LumpyGrits
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1985 CJ7 
 
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Location: The Mojave Desert Palmdale Ca. U.S.A.
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What gauge are you using?
IF, it's the OEM Jeep gauge. Don't believe it.........

LG
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Unread 10-07-2013, 12:01 PM   #3
PantherChicken
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1976 CJ7 
 
Join Date: Aug 2013
Location: Pike Road, Alabama
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Strangely enough my Jeep has the same issue. I just purchased the jeep a few months ago, and the oil pressure gauge, if it moved at all, just fluttered around aimlessly. As part of the sale, the PO gave me a new-in-box sending unit.

I replaced the sender this weekend, and now the guage sits right at 80psi whether the engine is idling or revved up. I assumed I just got the wrong sending unit, and it's not 'calibrated' to work with my gauge. The good news is that I know I have oil pressure now ;-)

(I'm running stock 304 V8 with stock gauges, the jeep is a 76 CJ7)
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Unread 10-07-2013, 12:14 PM   #4
myridge
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Yeah me too, Stock Gauges and NOS sending unit.
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Unread 10-07-2013, 01:07 PM   #5
MoneypitCJ5
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1977 CJ5 
 
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Location: Florence, AL
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I'd get a mechanical gauge and try to verify the oil pressure. If it is 80+ I bet there are problems with the relief valve or the oil filter. I think its supposed to pop off at about 70 psi.
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Unread 10-08-2013, 08:43 AM   #6
PantherChicken
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It's much more likely that there is a simple electrical issue or a mismatch between gauge and sender, IMHO.
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Unread 10-08-2013, 08:45 AM   #7
myridge
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I think you may be right. I have all sorts of electrical gremlins going on right now. I checked under the dash and its using the purple wire to the post on the guage and again under the hood.
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Unread 10-08-2013, 10:18 AM   #8
LumpyGrits
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The ele oil psi gauge that AMC used in our CJ's is a well known POS.
I had 3 sending units die while under warranty.
Don't trust'em, ever.........
LG
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Unread 10-08-2013, 12:30 PM   #9
Rollbar
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1984 CJ8 
 
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Here ya go-have them in my CJ8 and no problems. Twenty nine bucks.



http://www.summitracing.com/parts/sum-g2925/overview

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Unread 10-08-2013, 08:07 PM   #10
WSS
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Tried and true Stewart Warner gauges. All mechanical, no senders.





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Unread 10-08-2013, 08:18 PM   #11
LumpyGrits
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The Stewart Warner gauges made today are NOT what they once were.
The SW's in my Jeep are 25+ yrs old and are the best. The ones today are NOT.
http://en.wikipedia.org/wiki/Stewart-Warner

Today, if I wanted gauges. Here, is who I would deal with.
http://www.marshallinstruments.com/c...erformance.cfm

LG
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Unread 10-08-2013, 08:31 PM   #12
WSS
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Location: Chino, Ca
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Quote:
Originally Posted by LumpyGrits View Post
The Stewart Warner gauges made today are NOT what they once were.
The SW's my Jeep are 25+ yrs old and are the best. The ones today are NOT.
http://en.wikipedia.org/wiki/Stewart-Warner

Today, if I wanted gauges. Here, is who I would deal with.
http://www.marshallinstruments.com/c...erformance.cfm

LG
The only new one I have is the water temp. The rest are period correct for the Jeep.

I can't believe you of all people quoting wikipedia?

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Unread 10-08-2013, 08:52 PM   #13
LumpyGrits
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Yeah I know
BUT, this time they are 100% correct.
That is the ONLY reason I used'em.
Still, SW's of today are in name only............
LG
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Unread 10-08-2013, 09:01 PM   #14
WSS
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In the field (of heavy equipment) they are still highly trusted and used. I have never had anything but good luck with them. I would prefer American made of course but being made in another country does not make it a bad product. Obviously my opinion, so buy and use what you trust.

Way back, they were literally made like a fine watch, by the hands (no CNC!) of very skilled craftsmen. Now it is just a guy who loads a pallet and pushes the send button. LOL
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Unread 10-09-2013, 06:33 AM   #15
gmakra
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Seems to me that there is a lot of chatter brands of gauges but what if the relief valve on the oil pump is jammed closed and the gauge is reading correctly?
I would put any old gauge on the engine and verify the PSI and then come up with a plan of action.
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