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914World.com _ 914World Garage _ Loctite vs. Permatex

Posted by: Headrage Mar 14 2005, 02:27 PM

I'm going to plug off my air injection ports in my heads this evening and would like a general consensus on the best sealant to use. I will be using the old valve adjust screws and want to make sure that they don't back out but also that I may be able to remove them in the future if the need arises. I was thinking either Loctite high temp or Permatex high temp teflon. What'ya think?

Posted by: Cap'n Krusty Mar 14 2005, 03:06 PM

Loctite and Permatex have been the same company for years. Despite the temptation to "take the easy way out", you need to know the flange on the ait injector is the sealing surface, NOT the threads, so you run the risk of the plug leaking if the threads are not perfect, and leaks past the threads can further burn the head and cause permanent problems. I suggest you plug a set of injectors, either by brazing the top end, using a threaded cap, or tapping the bore for a plug. More work now, trading off against a potential major problem in the future. HTH, The Cap'n

Posted by: Headrage Mar 14 2005, 04:17 PM

I was looking at the injector tubes and the flanges butts up against the cooling fin on the head and wont go any deeper. I can't figure out how it would seal without running all the way through the fins and seat up against the head.

Posted by: Headrage Mar 14 2005, 09:19 PM

Or JB Weld?

Posted by: Headrage Mar 14 2005, 09:42 PM

Okay, I'll wait another day.

Posted by: McMark Mar 14 2005, 10:32 PM

How come one of our amazing members hasn't created a plug that will work as good as a braized pipe, but looks nicer.

Posted by: Headrage Mar 15 2005, 12:00 AM

I don't know!! I wish they would. I'm going with JB weld. I hope I never have to get in there again.

Posted by: jkeyzer Mar 15 2005, 12:13 AM

QUOTE (Headrage @ Mar 14 2005, 10:00 PM)
I'm going with JB weld. I hope I never have to get in there again.

I think that is an oxymoron.

Posted by: Headrage Mar 15 2005, 12:26 AM

You're right! No matter what I'm screwed.