Oil leak after changing gaskets

[E30_(1st Musk)_]

So before i ever touched my intake manifold gasket i had absolutely zero leaks.

I wanted to paint the intake manifold so i changed the gasket + oil return tube o-rings.

But now i have a leak that looked like it was coming from the oil return tube but it does not seam to leak from there.
I took my car to the track today and the oil looked like it was seeping through the head gasket but with no symptoms of a blown head gasket.

Where can i have messed up? one of the gaskets maybe?

[jlevie]

The possibilities for oil leaks on that side of the engine would be the center intake manifold gasket, oil return tube seals, or crankcase breather hose. When the car is sitting it is possible for that that's been drawn into the intake manifold to drip out the throttle body or at the gasket.

[E30_(1st Musk)_]

the crankcase tube leaked on to the valve cover but just a bit after my first laps.

I think it might be the center manifold gasket then but it was replaced when i painted the valve cover and since this day it began to leak.

also the reason i reasoned out the return tube o-rings is because the top one is not leaking and if it were leaking from the bottom one the oil wouldn't find its way up to the head correct?

[scrowner]

My guess is you missed tightening one of the air intake manifold nuts. That center gasket is different from the others in the set for the air intake. Did you notice it to be different? The silly oil return pipe is tricky to get in place and seated with the o-ring and washer. This will be something simple. How about the 4 nuts holding the throttle body to the air intake?

[E30_(1st Musk)_]

yes i noticed it to be different and i placed the correct gasket. The oil return is tricky but the bottom one sits in the block and the top one sits on the tube so i didnt have much trouble with that one. the TB is okay no problem

[MR 325]

the crankcase tube leaked on to the valve cover but just a bit after my first laps.

This shouldn't be leaking at all. Just to confirm you're talking about the hose from the valve cover to throttle body, yes? If you haven't replaced this hose you should, it's about $5. Make sure it has clamps on both ends too.