2F Intake/Exhaust Problem

[bull]

started having an issue with a rough idle when warm. When I would start it
up it would idle fine when cold. I would then drive it for 15 to 20 minutes
then at idle it would be rough and miss from time to time. After searching
the archives it sounded like a bad gasket or intake/exhaust crack. I removed
the intake/exhaust tonight and found 2 things.

1. exhaust leak (red squares in linked photo)
2. oil/gas? substance around the center intake. (yellow square in linked
photo)


number one speaks for itself, but number two troubles me. Why is there oily
substance? I notice a bit of smoke at start up in the morning, but after
about 2-3 seconds it dissapears. Should I be concerned about the oily
substance I see? Could it be from bad valve guide seals? Cracked head? :|
Has anyone seen or done this...Do I need to pick up the red phone and talk
directly to Mark Whatley? Can anyone give me any insight?

Engine Details
2F Rebuilt May 2001 17K miles since rebuilt
(new intake and exhaust)
Non-Usa carb


Pictures
http://www.slowspeed.com/i/tech/intake/gasket.jpg
http://www.slowspeed.com/i/tech/intake/head.jpg
http://www.slowspeed.com/i/tech/intake/valves.jpg


rodney
1976 FJ55

 

[toddslater]

Rodney,
I wouldn't hit the panic button just yet. I'd be tempted to have the intake and exhaust manifolds (since they are off) checked and planed if necessary. Then I'd probably do the two gasket trick (felpro) with liberal amounts of the permatex copper high temp. The oily issue around the intake is/maybe more troublesome. It visually looks like it may just be a slight oil weep. I'd re-torque the head...put it all back together and run it. Doing a compression check wouldn't necessarily find a slight oil weep in the HG. The puff is just some oil clearing out that sneaks past the guides at night. Nothing to worry about based on what you said. Now if it looked like an industrial pest fogger...that be different.

 

[Poser]

Clean it up, have the manifolds planed, put it back together, and run it.

Are you 100% sure that this 'oily substance' is in fact oil, and not something else? Was the carburator removed before the manifolds were taken off, or was it left on there? Could this be fuel that has made this area damp?

If you are not drinking/losing oil in a significant volume between changes, I would not sweat it.

But hey, that is just me.

Good luck!

-Steve

By the way, if you re-tourque the head, remember to re-tourque the rocker stands, and check the valve clearances, as they are all related...