a little oil on top of the LIM, where does it come from ? - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 11-02-2006, 08:48 AM   #11
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MAC.. please see your PM'* regarding me asking for more information on your experience with wicking.

I have reserves about the wicking theory since there is no oil in the head or intake where the bolts go in.
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Old 11-02-2006, 09:41 AM   #12
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Quote:
Originally Posted by BillBoost37
MAC.. please see your PM'* regarding me asking for more information on your experience with wicking.

I have reserves about the wicking theory since there is no oil in the head or intake where the bolts go in.
What'* below the LIM? The lifter valley and balance shaft. How do you think oil gets to the lifters and balance shaft? Pressurized oil right? Can you see where I'm getting at? And besides that, I have no more oil pooling on the LIM as I graciously explaned to you in my PM.
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Old 11-02-2006, 01:56 PM   #13
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Mac'* pm basically described that his first thoughts on his car was also a valve cover gasket. Through a friend that is a certified mechanic at Buick, he learned of this wicking.

While it worked for Mac.. the fix he did seems to me is merely a plug the hole type fix.

I don't remember any of the threaded holes for the intake bolts in the heads being open beneath and having access to oil. With the intake gasket laying on the head, there is no oil passages from the intake to the head that would explain a leak. Yes there is oil in the lifters and lifter valley, but not in this area.

If there is an opening for oil to get to the threads of these bolts, wicking seems very logical to an extent. And IIRC there is a certain gasketmaker or thread locker on the bolts when you remove them. Wicking IMO would look like seepage and be a small amount. This seems to be a puddle of oil.
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Old 11-02-2006, 10:09 PM   #14
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When I was writing my first post on this thread, I felt a great sense of jubilation of having the opportunity to help a fellow BC member, but I feel compelled to say that I am profoundly disappointed by the extreme skepticism that I have received from the other members posting in this thread. I am also very disappointed by the lack of appreciation that I have received from the original poster. :( :( :(
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Old 11-03-2006, 09:54 AM   #15
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Humm sorry if your felings are hurt but im sorta sitting on the sidelines trying to digest it all
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Old 11-03-2006, 11:27 PM   #16
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The oil pooling is a legitimate problem and the fix that MACDRIVE posted will fix it, however, if the bolts are leaking oil up the threads it is most likely that the vehicle has enough miles on it that the LIM gaskets should be replaced BEFORE they spring a big leak. Think of the oil pooling as an early warning sign for the LIM gaskets failing. Any time the LIM bolts are removed, the threads should be coated with a sealer. GM recommends Threadlocker 272 GM P/N 12345493 (Canadian P/N 1095348.

Why they leak is up for debate, I don't know myself for sure, but I would venture to guess that it may be caused (or progressed) by a faulty PCV valve. You see, there is no oil PRESSURE behind those bolts so you can't attribute it to oil pump pressure. The back side of those bolts are in the crankcase (zero pressure) side of the oiling system. It is the PCV valves job to make a slight vacuum on this side of the oiling system to prevent such leaks/seeps and to scavenge combustion gasses from the crankcase.

If the PCV valve fails or lacks performance, than combustion gases will build in the crankcase and produce a positive pressure. That pressure needs some place to go and it will find the easiest way out. That way out may be a seal, a gasket or a bolt thread. Which ever is the easiest way (least resistant...weakest sealing point).
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