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Old 01-15-2013, 07:56 AM   #1
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Common causes of oil leaks in new rebuilt motors?

One month old rebuilt motor in my 92 Wrangler 4.0 and as I am driving down the road, I smell oil burning (anything worse in life???), I see smoke coming out of the bottom and luckily my apartment is a block away so I cruise in downhill. It's dripping oil out the bottom of the engine (between the front wheels). I get underneath on my back and I start to cry. I then start up the engine and it's THROWING oil out, like a quickly leaking faucet. I shut it off and look around, nothing visible on the top or sides of the motor. I had it towed back to the mechanic. Maybe it's a simple line or gasket? The irony is that I had THEE YJ man in town drive it around and he said the guy that put the motor in did a GREAT job and this YJ is the best running jeep of it's type in town. I had it purring man! An hour later....I am coasting into my apartment. Any ideas what it could be?

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Old 01-15-2013, 06:52 PM   #2
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Oil leaks are not uncommon on a rebuild; but the rebuilder should find the leak and fix it. Sometimes its a gasket thats shifted during assembly, or some sealant that didnt seal.

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Old 01-15-2013, 09:21 PM   #3
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Mine leaked too. But I was my own mechanic so other than disappointment at some less than fantastic work I put in a new valve cover gasket after my first road trip. Happens to the best of them.
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Old 01-16-2013, 08:36 AM   #4
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had to tighten the bolts on my valve cover and oil pan about 3 months after rebuild, if its running good I wouldn't worry about it.
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Old 01-16-2013, 08:40 AM   #5
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You know, it ended up being the crappy oil sending unit AGAIN! That exlpains why the gauge kept fluctuating back and forth so much, mostly over 80. Easy fix but annoying for sure. Who has a superior oil sending unit? My mechanic says almost everyone will sell you the same inferior one. One other mechanic says O'Reilly's has the better oil sending unit.
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Old 01-16-2013, 11:12 AM   #6
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Buy the sending unit from a Jeep dealer. The electrical parts from parts stores suck these days, thank low price shoppers.

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