I did a top over haul on my engine and have one intake bolt that has oil on the intake. I have pulled the bolt and put some gasket sealant on the threads and put the bolt back and let it sit. It is leaking again any other ideas or is it possible to come out up the bolt hole? None of the others are leaking and the gasket looks dry every other place
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Re: 65 small block intake
All the bolts that go in the lifter valley have to be sealed with a heavy non-hardening sealer to the threads. If you sealed the bolt and it is still leaking you may have used the wrong sealer. Sorry, I can't think of the Permatex nomenclature of the stuff I use but it works.
If you didn't seal your other bolts, you need to do this as you will get a oil seep sooner or later. -
Re: 65 small block intake
Jimmy,
Which bolt?
I'm thinking that the threads is not where you need the sealant. I'm picturing a cutaway of the block, manifold and valley. The threads go into the block, and I assuming they're blind threads, so sealing there would not help anything. There may be oil around the shaft of the bolt, being as it's really inside the valley, or if the gasket that should be sealing that part of the manifold/head joint is faulty. You may be able to get by with putting some good sealant just under the head of the bolt where it contacts the manifold. Otherwise, I think it's dissassembly time again.
KevinComment
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Re: 65 small block intake
The intake bolts protrude into the lifter valley area, and oil will eventually migrate up the bolt threads and appear as seepage around the bolt heads unless you use a good thread sealer; I've always used ARP thread sealant, never had any seepage.Comment
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Re: 65 small block intake
Jimmy-----
As others have mentioned, sealer MUST be used on all of the bolts that go through to the lifter valley or the coolant passages. However, just as important as using the sealer is making sure that the threads in the cylinder head and the bolt threads are SCRUPULOUSLY clean prior to application of the sealer. If you don't do this, the sealer will fail in short order and seepage will re-occur.
I recommend using Locktite Pipe Sealer with Teflon. This product is also available under GM #12346004. I think that it's the same as the ARP sealer which John mentioned, too.In Appreciation of John HinckleyComment
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Re: 65 small block intake
Agree with Joe. If both the bolt AND head threads are not completely clean, then the sealant will not adhere to the metal surfaces, and the leak will continue. I also like the white "Pipe Sealant With Teflon". Not only is it an effective sealant, but it reduces friction, which enables you to more accurately torque your attaching bolts. Go with the Loctite stuff...................the stuff from GM is 19 bucks a tube, and does not contain any precious metal.
JoeComment
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