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Oct 6, 2003 | 04:33 PM

ford429cu

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Joined: Jan 2000

Posts: 259

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From: Mount Sunapee, NH

vacuum tree

I'm having a serious problem with the vacuum tree loosening up on my 67 390 after about 20-30 mins of the engine running. I have been putting teflon tape on the vacuum tree to ensure it doesn't leak, is that my problem of why it keeps lossening? If not what should I do?

Jeff

Oct 6, 2003 | 05:22 PM

Ratsmoker

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Joined: Feb 2001

Posts: 6,624

Likes: 8

From: Missouri

Never heard of that. How much torque are you putting on it? I used teflon on mine but it probably isn't all that necessary. You could put the teflon about halfway up the threads and put a small bit of loctite on it. I wouldn't get carried away with the loctite though.

Oct 6, 2003 | 10:32 PM

Putt

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Joined: Jul 2003

Posts: 2,232

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From: Colville, Washington

Could be that the threads on the tee or in the intake are worn enough that they don't grab well anymore. Pipe threads are a friction fit. Loctite makes a pipe sealant that is also a thread locker, called PST part number 592 for a small tube.

Oct 7, 2003 | 11:06 AM

rebocardo

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Joined: Jun 2002

Posts: 13,873

Likes: 3

From: Atlanta GA

Mine is loose again too and I tried the pipe sealant, it did not work for long. I think maybe the heat destroys it. I have a 1965 390 in my 1971. I am starting to think red lock-tite.