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Old 07-19-2011, 10:15 AM   #1
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Do I need a new engine?

So I just bought a '91 jeep wrangler 4cyl 5spd and just noticed that the oil pressure gauge is shooting to 80 and past when I accelerate. Now I am not mechanically inclined, and I had a buddy of mine who is really good with jeeps look it over right when I got it and he couldn't find anything wrong with it. When I pop off the oil cap, there is a lot of blowback. I even took it to a shop today and the guy told me that I would need a new engine because of a bearing going bad. Now should I believe him, or go beat the guy up who sold me the jeep? I don't really want to put a new engine in it, but I do love my jeep. What do you guys think it is? Any feedback would be much appreciated.

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Old 07-19-2011, 10:25 AM   #2
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well oil pressure will increase the faster you go, that is normal... although i dont know specifically what pressure it should be at, other than that.. do you hear anything weird.. and have your jeep friend look at it again

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Old 07-19-2011, 10:33 AM   #3
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Oil could be too thick. I used 3qt 85w-90 gear oil in my old xj and ut caused the same problem you have. I use synthetic 10w 30 in my I6 yj.
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Old 07-19-2011, 10:45 AM   #4
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x2, also make sure its not over filled. Its normal for the oil pressure to go up as you give it gas. It naturally speeds up the oil pump creating more pressure.

Its a constant lack of oil pressure that would be a bigger concern.
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Old 07-19-2011, 10:50 AM   #5
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Quote:
Originally Posted by banks316
Oil could be too thick. I used 3qt 85w-90 gear oil in my old xj and ut caused the same problem you have. I use synthetic 10w 30 in my I6 yj.
x3 I use quaker state synthetic 10w-30 and IMO it works the best for my jeep.
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Old 07-19-2011, 10:54 AM   #6
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Mine just sits at like 80 all the time, any idea?
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Old 07-19-2011, 12:34 PM   #7
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As fas as I can tell there is no noticeable knocking or anything like that. The guys who checked it out said that there was too much blowback and that there are metal shavings in the oil. But when I checked out the dipstick, I saw no metal shavings. Idk what to do
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Old 07-19-2011, 12:53 PM   #8
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If there are metal shavings in the oil when you drain the oilpan, THEN yes you have a problem.
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Old 07-19-2011, 01:34 PM   #9
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Really thick oil to mask a problem?
The engine should have a oil pressure release valve. Too much pressure is not
really a problem, not enough is
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Old 07-19-2011, 01:34 PM   #10
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Change the oil and filter and see what ya got after that.
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Old 07-19-2011, 06:28 PM   #11
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always instal a mechanical gauge and verify your oil pressure before pumping a bunch of money into what may be a ghost problem as it could be a simple faulty sender unit or a relief valve but find the true oil pressure then go from there
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Old 07-19-2011, 06:42 PM   #12
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On my 87 Wrangler and my 94 Cherokee the oil pressure Gage does the same thing.
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Old 07-19-2011, 07:17 PM   #13
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I'd check your pressure sending unit. It's like $15. And check the guage. The nut on the back can come loose and throw it off. Happened to mine. Check both and see if that changes your reading.
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Old 07-19-2011, 07:17 PM   #14
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At idle pressure should be around 25-35 psi, above 1600 rpm 35-75 psi. that is for the 2.5L. All according to Chilton manual. Thats if your gauges work correctly, they are famous for being intermittent.
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Old 07-19-2011, 07:34 PM   #15
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It turns out that I threw a bearing. My engine started to knock ever so slightly, and there were metal shavings in the oil. So at this point I am probably going to contact a few people who have engine connections and get a swap. I don't have the time to do it myself, or I would pop that hood open and work all day. Sigh. Live and learn.

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