Residual oil on head/exhaust mani

[2nd Gen Mnstr]

Alright so i have been having this problem for a while and cannot figure it out. When i open my hood right under the valve cover on the bolts of the exhaust mani and inbetween there is a good amount or residual oil forming. i have wiped it off many times and it always seems to come back. I just replaced the valve cover gasket and thead is no cracked. any idea on what it might be?

 

[campos_racing]

I had that problem too. I bought a new vc gasket and put gasket maker on the head where it meets the gasket. screwed the bolts back on and it didnt happen again.

 

[97gsxIA]

Got any stripped/broken exhaust mani studs? One or two of those exhaust mani studs will thread back to a oil port and can leak.

 

[2nd Gen Mnstr]

one is not in there. it is the far right top bolt. but the residual oil in on the middle two leaking inbetween them, and i just put a new valve cover gasket on.

 

[Marceldsm]

Got any stripped/broken exhaust mani studs? One or two of those exhaust mani studs will thread back to a oil port and can leak.

i had the same exact problem

in my case the oil pressure puched the stud out

 

[BogusSVO]

The bottom center exhaust mani stud is factory threaded into an oil return port in the head.

Pull and clean this stud.
Pull the VC, and look right behind that stud.
Stuff rag in the oil return port.
Spray a tad of brake clean in the stud hole, to remove trace oil.
Remove rag from oil return port.
Place a small dab of RTV on the stud threads.
Install stud back into hole.
Install the VC
Torque center e-mani nut to spec.

 

[BogusSVO]

i had the same exact problem

in my case the oil pressure puched the stud out

Please post a pic of what Exhaust stud is installed into a pressurized oil galley.

 

[007jimmy]

OP, Were the mating surfaces cleaned properly? Also everytime i use a fresh VC gasket, after a couple of heat cycles i can squish the gasket down more by retightening the bolts. Just dont go crazy tightening the inner bolts. Works everytime. Only have to use RTV very lightly on the corners and by the cam caps.

 

[97gsxIA]

i had the same exact problem

in my case the oil pressure puched the stud out

The oil return port is not something that sees the kind of pressure you're describing.

OP: Follow Bogus' instructions. He knows what he's talking about.

 

[briank]

Have you have verified the valve cover is not cracked?

 

[2nd Gen Mnstr]

my origianl valve cover was cracked and i got a new one with no cracks and a new valve cover gasket. it still leaks and it seems to be coming from 3 different places. i will post pictures soon.

 

[Thungar]

I had a cracked exhaust mani and it would get oil on my vc.

 

[2nd Gen Mnstr]

some of hte picture i posted arent that great. if you go into my gallery you can look at the one labeled oil and you can see the residual oil.

 

[BogusSVO]

That pic is a bit far away.

Try getting a better, closer one.

Laod it as an attachment in the thread.

 

[2nd Gen Mnstr]

i found out the problem... my piston rings on cylinder two are cracked. When i compression tested it it came up not even past 20psi.

 

[BogusSVO]

Did you all ready pull the piston to confirm cracked rings?

Or are you just thinking of that from the result of the compression test?

 

[2nd Gen Mnstr]

i am assuming due to residual oil on the exhaust manifold, the fact that the top of the piston was wet when we pulled the plug, the oil smelled a little bit like fuel and the compression test failure.

 

[2nd Gen Mnstr]

i am just taking a guess. any idea that could cause the symptoms (wet piston top on cylinder 2, residual oil leaking out exhaust mani, bad compression test.) it did get better when i added motor honey to it so i could drive it.

 

[Boosted954t2h0c]

"Oil residue on exhaust manifold"
Glad people are discussing this on here. i ran into this as well. the very center, lower exhaust mani stud hole is open to an oil return passage in the 2nd gen heads. This must be one of mitsubishi's great ideas. I'm going to try Hydrolic sealer type locktite on this and hope it seals. anyone ever try this?? i think rtv would burn up with the heat from the exhaust...? but i also hope lock tite doesnt rip out my head threads if i need to remove the studs... am i correct or not? thanks guys

 

[BogusSVO]

Permatex ultra copper is rated to 750* should be all you need to seal the center bottom exhaust stud.

 

[Boosted954t2h0c]

Ok cool. Thanks