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Old 06-24-2008, 02:53 PM
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Leaking Intake Mani Gasket!! :@

So I can't seem to stop the oil leaks out of my intake manifold on my freshly built 383 SBC. The oil leaks out of both the front and rear of the manifold where those peice of **** rubber seals are. The sides of the manifold (against the heads) are fine with 0 leaks. It is just those damn rubber seals that leak like crazy and the oil makes its way down to the headers and my entire driveway is covered in smoke from it burning once it hits the headers My question is, what kind of sealant should I use to coat the entire area where the oil is leaking?? I DO NOT want to remove the intake manifold and put new rubber seals in since these were brand new and they WERE installed correctly with RTV gasket sealant applied on both sides!! The only thing that seems it will work is to apply a thick layer of sealant to cover the area completely bettween the intake manifold and block. Any and all help here appreciated.

Thanks,
Keith

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Old 06-24-2008, 02:57 PM
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You need to PULL the rubber seals out.....NEVER NEVER NEVER use them.....Ultra Black RTV ONLY

once you get the POS seals out then you will have to pack the crack full of RTV.


Of course the best thing would be to pull the intake back off and go from there....its not that big of a job.
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Old 06-24-2008, 03:40 PM
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I agree with Holder, I never ever used those rubber end gaskets or the stick on cork type. I always put a fat bead of black RTV and it never leaks.
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Old 06-24-2008, 03:41 PM
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So I could possibly get them out with a pair of needle nose your saying??
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Old 06-24-2008, 04:54 PM
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You need to pull the intake to do it properly. Pull it, remove the rubber seals, lclean all the oil off of both mating surfaces, lay down a 1/4 thick and wide bead of black RTV putting a little extra in the corners. Set manifold down straight and aligned. If your manifold bolts come straight up I cut some long bolts, thred them into the heads for proper alignment. Set manifold over studs yuo made and torque to specs. If you try to remove them and install RTV without taking it apart you will still have leaks. The seal depends on the manifold squishing down the RTV. You will never get it sealed any other way.

Chet
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Old 06-24-2008, 05:04 PM
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Also, you will never get the surfaces clean, and RTV will not stick to an oily surface. Sorry to say, ya gotta pull the intake.
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Old 06-24-2008, 05:39 PM
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yep....pulling the intake is about the only way....you might have a worse leak than before by trying to shortcut.

Sad to say this is a VERY common mistake.....most of the intake sets I sell I always try to tell the person to make sure to throw them away and use RTV.

Just like I tell everyone not to handle the glass on the newer headlamps.
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