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Oil from center exhaust manifold stud hole?

jmargelo

Proven Member
51
0
Dec 18, 2003
Glen Rock, Pennsylvania
I just had my 1G head rebuilt along with a 6Bolt. There seems to be oil leaking from around the center stud for the exhaust manifold. The oil mostly leaks when the turbo is boosting. I tightened the nut as much as I could, and it leaks a lot less now.

So, why would there be oil leaking from there and how do I fix it?
 

Mirage2LTurbo

Proven Member
884
1
Sep 4, 2003
New Albany, Indiana
jmargelo said:
I just had my 1G head rebuilt along with a 6Bolt. There seems to be oil leaking from around the center stud for the exhaust manifold. The oil mostly leaks when the turbo is boosting. I tightened the nut as much as I could, and it leaks a lot less now.

So, why would there be oil leaking from there and how do I fix it?


If I'm not mistaken, there are 3 stud holes that have oil passages directly behind them, the center 3. Could be the studs were'nt threaded down far enough, or maybe that hole had been drilled out before and rethreaded, so it's slightly larger and allows oil to leak through the threads. It probably only leaks when you're boosting because oil pressure is going to blitz to ~85psi once you get above a few thousand RPM.
 

jmargelo

Proven Member
51
0
Dec 18, 2003
Glen Rock, Pennsylvania
I'll try screwing the stud in further. All of the other studs are in a lot further than this one is. Thanks.
 

My96AWD

Proven Member
254
1
Aug 9, 2003
westland, Michigan
you need to put thread sealer on the middle one, it has a oil passage behind it. btw this is not extreme.
 

Mackzero

Proven Member
596
1
Jan 2, 2004
Moses Lake, Washington
I had that exact problem with one of the heads I had done a few years ago. The machinest could not get the head stud out so he drilled it out and put a heal-a-coil (don't know if that is how it is spelled) in there and he actually drilled my oil passage. Oil everywhere when I went into boost. I ended up selling it to one of my friends and he put a small ball of liquid steel down in there before he put the stud back in. Problem solved. Just a suggestion if you can not stop the leak with anything else.
 

jmargelo

Proven Member
51
0
Dec 18, 2003
Glen Rock, Pennsylvania
Got the stud to go in further and used sealer. Problem solved. Now we found another leak. BAH!
 
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