intake manifold bolt leaking oil?

[zdatsupra]

wtf?
I scanned my fsm and maybe I missed it. Is there supposed to be sealant applied to the bolt that is on top of the intake manifold closer to the alternator?
I seem to have a oil seeping leak that builds up on the intake runner. I thought it was gas and actually had a gas leak at one point. Now Ive eliminated gas and it seems to be oil and its seeping out of the bolt...
I thought it was because maybe someone put grease on the bolt before installing so I took it out, cleaned it up and now a few runs later I have build up on the intake runner.
Very very frustrating, everything else about my engine rebuild seems to be ok..knock on wood.

Some cars needs tlc, mine needs a extra marital affair!

 

[gaboonviper85]

No none of the bolts in the intake can leak oil...it's probably you valve covers.

 

[Mk3runner]

sure its not coolant?

 

[gaboonviper85]

sure its not coolant?

Only one bolt sees coolant and that's on the bottom of the first two runners...it's also not a bolt but rather an npt fitting

 

[Mk3runner]

yeah I know.. but its just a thought.

 

[zdatsupra]

I have to think if it was the valve cover gaskets Id have evidence from there down to the manifold.
I swear the threads were slimy like oil was coming from the bolt. I will have to look again, may just put sealant on there and see what happens.
On second thought maybe dye would work in oil and I could trace it with a uv light?

The npt fitting below the runners- I have this capped off as I removed that part of the coolant circuit.

 

[sk6471]

If the PCV is sucking oil into the intake line and your intake manifold is a little loose, oil will be forced out around the bolt under boost. How much oil do you have in the intake tract, intercooler, and manifold? If there is any, you need to clean it up and figure out why your engine is leaking so much pressure into the crankcase.

 

[zdatsupra]

If the PCV is sucking oil into the intake line and your intake manifold is a little loose, oil will be forced out around the bolt under boost. How much oil do you have in the intake tract, intercooler, and manifold? If there is any, you need to clean it up and figure out why your engine is leaking so much pressure into the crankcase.

Thanks, You bring up a good point because even after this rebuild and everything I have done, I have failed to even check the pcv valve in a very long time.
I was recently in the "3000" pipe area and there was no oil at all in it or on the TB. Not using any oil or blowing smoke so this may be a long shot but at least a good reminder to check the pcv valve and get the wheels turning on any other possibilities.
I think I am going to use the dye and that should help me track it down, its something I forgot I could do for oil or coolant leaks as when I was chasing down my fuel leak its something I couldnt do.
Its just about time for my break in oil change anyways.

 

[CyFi6]

Actually, believe it or not there is an intake manifold stud or two, i cannot remember which ones, that go through into the camshaft area of the head. If they are loose or dont have sealer on them, they could possibly leak oil. I will look at my head tonight and take pics if it seems like a possible problem.

 

[zdatsupra]

Actually, believe it or not there is an intake manifold stud or two, i cannot remember which ones, that go through into the camshaft area of the head. If they are loose or dont have sealer on them, they could possibly leak oil. I will look at my head tonight and take pics if it seems like a possible problem.

It would be easy to confirm if you have a disassembled head on the bench..

 

[CyFi6]

Took a look at my head last night, but wasnt able to snap any pics. The top left most stud does in fact thread into a hole that goes all the way through into the crankcase. There is a bolt at the very front of the intake runners, in the middle, then the first hole above the number 1/2 intake runners has a stud in it, which extends into the crankcase.

 

[zdatsupra]

ok, someone mentioned pcv valve.
I fail to find a typical pcv valve on my car. the service manual shows pcv lines and a orifice on the tb. The 2 breathers are plumbed back to my airfilter similarly to a stock set up, (I built a adapter that allows the gases to go back to the turbo inlet) the other end goes to the tb.
I dont remember ever seeing a pcv valve. Am I missing something here?
I dont think it suffering from overpressure, just wondering about the pcv system.

 

[shaeff]

There is no PCV valve.

 

[gaboonviper85]

ok, someone mentioned pcv valve.
I fail to find a typical pcv valve on my car. the service manual shows pcv lines and a orifice on the tb. The 2 breathers are plumbed back to my airfilter similarly to a stock set up, (I built a adapter that allows the gases to go back to the turbo inlet) the other end goes to the tb.
I dont remember ever seeing a pcv valve. Am I missing something here?
I dont think it suffering from overpressure, just wondering about the pcv system.

There is no valve....your routing is better than nothing but it's far from perfect...you should route it to the throttle also so you pull vac at idle....there is very little vacume infront of the turbo and 0 vacume at idle unless you go to the throttle port....with the use of check valves the system could be even better.

 

[zdatsupra]

There is no valve....your routing is better than nothing but it's far from perfect...you should route it to the throttle also so you pull vac at idle....there is very little vacume infront of the turbo and 0 vacume at idle unless you go to the throttle port....with the use of check valves the system could be even better.

that end does go to the throttle body "tb", just like stock.
theres no pcv valve like shaef confirmed.
i misread first post that said simply "pcv", not pcv valve.
i think its all good.

 

[gaboonviper85]

that end does go to the throttle body "tb", just like stock.
theres no pcv valve like shaef confirmed.
i misread first post that said simply "pcv", not pcv valve.
i think its all good.

Oh I thought you routed both valve covers into the turbo intake.

 

[zdatsupra]

Took a look at my head last night, but wasnt able to snap any pics. The top left most stud does in fact thread into a hole that goes all the way through into the crankcase. There is a bolt at the very front of the intake runners, in the middle, then the first hole above the number 1/2 intake runners has a stud in it, which extends into the crankcase.

thanks for checking that out.
I finally took the bolt out tonight, for some reason I have a stud and a bolt switched. I applied sealant to it so that should stop the seeping leak.
Before putting it back in I applied air to the bolt hole, no doubt about it, that hole goes all the way into the head somewhere, I got air to come out of the oil filler. It would be nice if the Trsm mentioned this small tidbit of info...