4.0 seeping oil on passenger side head gasket - JeepForum.com
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Unread 09-29-2013, 06:20 PM   #1
bkohler2005
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4.0 seeping oil on passenger side head gasket

Do these 4.0 just plain and simply leak? This is a reman engine with 12k on it. I have very small amount of oil seeping from the passenger side of the head gasket where it meets the block. Its not much but is blown/ runs back and down the back side of the block and creats a drip on the bottom of the flywheel cover. It does not drip unless it sits for a week or so and then its a single drop. Is anyone else having this issue, is it normal.... because its driving me nuts.

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Unread 09-29-2013, 06:41 PM   #2
2003RubiBlue
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Are you sure its not the valve cover. The head gasket should not leak at all.
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Unread 09-29-2013, 07:06 PM   #3
bkohler2005
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yes, its not the valve cover. Dry as a bone all the way around.
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Unread 09-29-2013, 07:44 PM   #4
2003RubiBlue
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I've never run into one that was leaking oil externally on the head gasket. No oil in the coolant, coolant in the oil I would run it until it gets worse, but that is not normal. Any warranty on the reman.
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Unread 09-29-2013, 08:37 PM   #5
bkohler2005
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yea, no mixing of fluids. Its a Napa auto parts reman engine. I think they will warranty the gasket but the labor? I would just do the job myself, but just one more thing to have to find time for. Was not impressed with the shop that put the engine in. I hate oil leaks!
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Unread 09-30-2013, 03:20 AM   #6
Necko2529
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What would make a 4.0 just plain leak? Im pretty sure DC hasn't engineered leaks of any kind in the 4.0 from the factory so i would say no, the leak is not something that's normal.
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Unread 09-30-2013, 05:24 AM   #7
bobjp
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It's not normal, and I would be worried about it. If it can leak there, then it can eventually start leaking into the coolant the the cylinders. I wonder if there's a flatness issue with the head or block?
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Unread 09-30-2013, 03:19 PM   #8
TravisHeim
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I don't really see how it could be leaking oil in that location and not have some serious combustion/cooling issues. Not much going on in that part of the block, its just a passageway for the push rods and oil to return from the head. Have you considered having a dye test done?
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Unread 10-01-2013, 08:04 AM   #9
bkohler2005
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I am taking it to the shop that put the engine in it this saturday. We will see what they say. Kinda between a rock and a hard place, the engine is still under warranty but I was not too impressed with the work the shop did putting in the engine. If I do the work myself, I void the warranty....
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Unread 10-01-2013, 08:19 AM   #10
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Quote:
Originally Posted by bkohler2005 View Post
I am taking it to the shop that put the engine in it this saturday. We will see what they say. Kinda between a rock and a hard place, the engine is still under warranty but I was not too impressed with the work the shop did putting in the engine. If I do the work myself, I void the warranty....
In this case, keep taking it back until they work all the bugs out...
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Unread 01-02-2014, 09:21 PM   #11
bkohler2005
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Figured it out, after pulling the head myself. I found that when the block was machined for remanufacturing the engine, they left some grooves in the top of the block on the right side. The oil has been seeping thru, running back and down the rear of the engine. I buffed them smooth and had the head flattened by a machine shop. Then went back together with it. That was 500 miles ago. No more oil leaks.
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Unread 01-03-2014, 08:34 AM   #12
Vinman
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Why did you feel the need to have the head machined when the grooves were in the block?
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Unread 01-04-2014, 11:04 AM   #13
bkohler2005
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To make sure it was a flat surface to reseal. Which it was not. Each end was higher than the center. I even untightened it in the correct sequence. The inline six cylinder engines head is longer and easier to warp when removing, I didn't want any excuse for it to leak later and say well I should have done...... Fix it right the first time and there won't be a second time.
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