Sealing off unneeded ports on aftermarket replacement exhaust manifold? - JeepForum.com

 
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post #1 of 8 Old 09-02-2011, 12:09 AM Thread Starter
NonRubicon
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Sealing off unneeded ports on aftermarket replacement exhaust manifold?

I just got a replacement cast iron exhaust manifold and it is made to fit several different years of the 4.2L, so it has ports that aren't on the 1990. It came with threaded steel plugs to block off any ports that I don't need.

Do I need to do anything other than get the plugs good and tight to make sure they don't leak? I'm guessing that JB weld or red loctite wont withstand the exhaust maifold temps.

this is the manifold:



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post #2 of 8 Old 09-02-2011, 06:03 PM Thread Starter
NonRubicon
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Just thinking...anyone use 2000*F copper RTV for sealing plug threads on the exhaust manifold smog ports? Or should I just find some NPT brass fittings and not bother with RTV to seal the threads?
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post #3 of 8 Old 09-02-2011, 09:14 PM
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Quote:
Originally Posted by NonRubicon View Post
I just got a replacement cast iron exhaust manifold and it is made to fit several different years of the 4.2L, so it has ports that aren't on the 1990. It came with threaded steel plugs to block off any ports that I don't need.

Do I need to do anything other than get the plugs good and tight to make sure they don't leak? I'm guessing that JB weld or red loctite wont withstand the exhaust maifold temps.

this is the manifold:

just use teflon tape.....thats what i always used
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post #4 of 8 Old 09-02-2011, 11:03 PM
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Let's see, I've been using brass hardware on the exhaust system for the last thirty years or so, and putting RTV Copper on exhaust gaskets as a matter of course for at least twenty - and having no trouble either way. So, you'll be fine.

Theoretically, NPT doesn't require the use of sealant - but I know I feel better if I use the stuff anyhow. RTV Copper - I've not quite worked myself up to using PTFE on anything that runs over 500*F, no matter what the label sez...

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post #5 of 8 Old 09-02-2011, 11:35 PM Thread Starter
NonRubicon
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Thanks for the replies.

Not really sure about teflon tape withstanding exhaust manifold temps myself. I'll check around the local hardware stores and see what NPT brass fittings I can find.
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post #6 of 8 Old 09-05-2011, 07:34 PM
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Just put the plugs inplace of the Air Injection Manifold Pipe, They are not going to leak and after they have been in for a while you will have trouble getting them out.
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post #7 of 8 Old 09-05-2011, 08:00 PM Thread Starter
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Ended up just using the plugs that came with the manifold. Brass fittings were too expensive. Put a little copper RTV on them to help ensure the threads are sealed good for now. Kinda figured that they would eventually get frozen in, but wasn't to sure about them leaking any when newly installed.

Thanks again all.
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post #8 of 8 Old 09-28-2011, 08:15 PM
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just use some teflon tape
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