Oil leak, rear lower intake.

[91CoupeMike]

Okay, so after installing the lower intake 2 times I still have an oil leak.

Anything I can do without pulling the intake off again? :/

I just went out and beat on it and I had some smoke at wot and through the shifter at idle.

Popped the hood, and noticed it going down the passenger side of the block and getting on the header, causing the smoke.

Shouldn't the pcv valve pull vacuum to keep crank case pressure down? I'm assuming at higher engine rpm it blowing out of the back of the intake.

[91CoupeMike]

Ding dong moment, at wot there is no vacuum, so that would explain the crankcase pressure.

Open to any and all suggestions!

[Baron Von Crowder]

use RTV on the front and rear where the intake meets the block, no gaskets.

[91CoupeMike]

use RTV on the front and rear where the intake meets the block, no gaskets.

That is what I did, I guess I didn't use enough?


I put like a 3/8th bead along the ridge of the block and dropped it straight on.

[ktm300hater]

clean and dry before you put it on? And your sure you didnt move it?

[91CoupeMike]

Cleaned with brake cleaner and a razor. :/

Can I shove some rtv in there? Or will that just leak too?

Fml god damn 1250s3s are not cheap

[robert]

Sure it's not a valve cover leak?

[91CoupeMike]

Sure it's not a valve cover leak?

Yes, I can see it right behind the pcv valve. Valve covers are dry.

[FOKAI]

More pooky torque down let it dry call it a day. Good luck

[Vertnut]

Could it be the PCV valve itself?

[91CoupeMike]

Could it be the PCV valve itself?

The grommet is dry, but the block is oily.

[FastFox]

Do it right. Pull the intake back off. Clean the block surfaces and the intake. Take a small center punch and tap a little ding in both the block surface and the intake. Put a ding about every quarter inch. Use just a little sealer and a dob at the corners. when you tork the manifold down, the gasket will be pressed into the dimples you made. The gasket will not crawl out of where it is supposed to be. I have used this method many times. I learned it from an old mechanic back in the 60's. Works well on a small block chevy too.

[46Tbird]

Can I shove some rtv in there? Or will that just leak too?

That will just leak. RTV does not stick to oily surfaces.

Not much you can do but seal it again. If you're having an issue with 'only' RTV at the manifold ends, I suggest finding a brand that uses the valley gaskets that grip the edge of the block. I can't recall if I've seen this type for an SBF, but it might be worth looking for at this point.

[robert]

What FastFox says
Do you recall how much silicone-sealer you used?
Should be a thick bead across. G/L

[91CoupeMike]

I have dimples In the intake already.

Shoot!