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Registered User
Join Date: Feb 2014
Location: Norway
Posts: 5
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High oil pressure after changing oil tank
Hi, i have a 71 targa with a 2,7 engine. My original oil tank was broken and i got a oil tank from a 76 SC. I put the new tank in and now my oil pressure is much higher. At idle it shows 2 bar, at 2500 rom it shows 5 bar, at 3000 rpm it shows 6-6,5 bar. This is at normal temperature. When its cold it reads almost 8 bar at 2500 rpm.
I have checked with a mechanical oil pressure gauge and it reads the same. Pulled the oil pressure switch and put a small rod down the hole and i can move the oil pressure relief valve . What is wrong  Michael |
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06-24-2014, 12:42 PM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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oil pressure is still too hi. i would question the sending unit being compatible with the gauge.
even idle pressure is realistically too hi. the 77 did have a higher pressure pump from the early cars but 2bar (29psi) is not realistic....if your idle is 900-950. mine was betwen 15 and 20 psi at idle. you may have a blockage in the oil path
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold Last edited by T77911S; 06-25-2014 at 10:19 AM.. |
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06-25-2014, 08:27 AM
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Join Date: Apr 2007
Location: wisconsin
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Interesting. Is it possible your original tank had a blockage? Why did you replace it? Oil tanks usually don't "break."
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06-25-2014, 08:51 AM
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Registered User
Join Date: Feb 2014
Location: Norway
Posts: 5
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My oil tank was thin as paper and full of smal holes, PO did try to fix it with plastic padding
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06-25-2014, 10:21 AM
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Registered User
Join Date: Feb 2014
Location: Norway
Posts: 5
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Quote:
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06-25-2014, 10:39 AM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
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you may have something from the old tank clogging an oil passage in the engine.
a sticking pressure relief would only allow pressure to build past the relief point, not increase pressure at say idle. you could also have a relief problem if your pressure is going as hi as you say it is. i know on my 77 when it was cold in the winter my pressure could go above 100psi. i drove it very easy to keep it below that until warm. did nto want to blow oil cooler.
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86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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06-25-2014, 10:46 AM
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Registered User
Join Date: Feb 2014
Location: Norway
Posts: 5
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The pressure was fine with the old tank, it was after i put the new tank in i got the problem
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06-25-2014, 11:24 AM
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