oil pressure? - Great Lakes XJ

titus

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Date: Apr 1, 2006

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has anyone had this problem or heard of it?i rebuilt a few 4.os and 4.2s and i have never seen this or heard of it even the guys at work have never seen it ,i went to put the 87 on the lift ,fired it up for maybe 2 seconds and i heard a pop and new somthing was wrong,shut it down looked under the hood and there was five qaurts of oil on the ground ,looked like i threw a rod ,but didnt ,blew the oil filter apart not once not twice,3 rd time i put on a fram and it didnt blow the case but it blew the seal out ,so some how the oil pump is putting out about 200 psi maybe more ,we think its a check valve that blew ,so when i drop this pan to replace the pump ,i know im not gonna like what i see and want to rebuild it,any one have any ideas? __________________

01XJ

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Date: Apr 1, 2006

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OUCH! Sorry about your luck. There are a few people on here who know a lot about engines. I am sure they will chime in. I hope you get it figured out. __________________ 2001 Cherokee Sport -- 40k -- 4x4 -- 4.0 HO -- AW4 -- D30 -- 8.25 -- OME 930 coils -- Rusty's full length 2" AAL -- Sensatracs -- 30x9.5 on Jeep Grizzlys -- Homebrew Safari Rack My Pics and Specs

xjjeepthing

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Date: Apr 1, 2006

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Not heard of this problem on the Jeep motors but, seen several 3.1 GM motor stick an oil pressure relief valve and blow the filter. __________________ If guns kill people, then I can blame misspelled words on my pencil" - Larry The Cable Guy GIT-R-DONE My Pics and Specs

LEAD_NOT_FOLLOW

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Date: Apr 1, 2006

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Need some more info:

Does it only do it at higher RPM's or does it do it at idle as well?
What viscosity oil are you running?
Have you actually measured the oil pressure to see what it's at before it blows the filter, or is the 200psi a guess?

You definatly have oil pressure build up which is indicative of a blockage somewhere on the high pressure side of system.

Some probable causes for high oil pressure are:

* Partially spun bearing.
* Blocked or partially blocked oil passages
* Using an oil with too high of a viscosity.

You might want to remove the valve cover, and see how she's oiling up top. With high pressure it should be getting plenty of oil to the rocker arms. If not, check the tubing running up the back driver's side of the engine to the head for kinks or mashed spots, or take it off and blow through it. If this tube is restricted it will increase oil pressure, not to mention what lack of oil does to the valve train....

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Topic: oil pressure?