Exhaust Manifold Stud Oil Leak

[1991ZR1]

Looks like I have a bigger problem. The problem is that I don't know where the oil is coming from. I removed the exhaust manifold and took out the center stud. When I removed the stud, the threads were dry. No oil. Everything is a mess so I can't tell where the oil is coming from. The only thing above the exhaust Manifold is the cam cover but that does not appear to be leaking. I cleaned things up a little and I'm going to have to reinstall the manifold and see if there is still a leak. If it still leaks, I have to remove the manifold again and look for fresh oil.

[Z51JEFF]

A leaky dipstick tube seal will cause a leak.

[scottfab]

Originally Posted by 1991ZR1

Looks like I have a bigger problem. The problem is that I don't know where the oil is coming from. I removed the exhaust manifold and took out the center stud. When I removed the stud, the threads were dry. No oil. Everything is a mess so I can't tell where the oil is coming from. The only thing above the exhaust Manifold is the cam cover but that does not appear to be leaking. I cleaned things up a little and I'm going to have to reinstall the manifold and see if there is still a leak. If it still leaks, I have to remove the manifold again and look for fresh oil.

If not the stud then the usual suspects are the Oil Pressure Sender and the Oil Level sensor if your MY has one. The leak can run along the side of the engine and gets to the bottom.

Best detection is a complete cleaning of all oil.
Then allow to dry and then a drive.
If it's still there it's then easier to detect.
Good luck.

[Pete]

Guys he said "driver side"

Check cam sensor.
Also one of the 3 power steering mounting screws goes thru needs RTV,it's the one furthest left just take it off RTV it and reinstall.

Also it might give you some more working room if you take motor mount nut off and jack up/raise motor a bit.

Pete