REMOVAL OF EXHAUST MANIFOLD PLUGS - Chevelle Tech
2001 General Tech questions from 2001

 
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post #1 of 11 (permalink) Old Feb 11th, 01, 10:49 AM Thread Starter
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Hi guys ihave an ls6 car and someone put plugs on the manifolds and now i am tring to get them out.I am trying to get them out so i cam can put the air tubes back on for my smog system.Any idea,they wont bulge a bit.Thanks in advance.

Ray Griffin

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post #2 of 11 (permalink) Old Feb 11th, 01, 11:13 AM
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Mr Bill
 
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Ray,
You will probably have to heat them with a welding torch to get them out. Even that does not work at times and you have to end up drilling etc. It can get difficult.


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post #3 of 11 (permalink) Old Feb 11th, 01, 2:06 PM
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Thats not a good sign Ray.I bought the same thing only to get them home and after using a plumbers pipe wrench to remove the frozen plugs,found the threads got moisture in them and were all rusted out.I had to get my money back.I couldn't even retap the threads.Most guys plugged those smog holes.After 30 years the plugs freeze up.

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post #4 of 11 (permalink) Old Feb 11th, 01, 2:59 PM
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try letting some penetrating oil on it for a couple of days,then drill out the center of the plug,(drilling out the center seems to relieve tension against the threads)then use an easy out to remove the remainder of the plug.
I might be mistaken but I believe there is a Helicoil available to rethread if necessary,

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post #5 of 11 (permalink) Old Feb 11th, 01, 9:25 PM
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heilicoil might not work because of the high temp. try heating with a propain torch and then, i know you are gona say WHAT!, take a candle and drip the hot wax on the plug.

this is an old meachienist trick. the hot wax is wicked in to the thred's and lub's them so it will come out. give it a try iy can't hurt anything.
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post #6 of 11 (permalink) Old Feb 12th, 01, 7:38 AM
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I just recently had to perform this. I tried everything and finally settled on drilling them out and punching the rest through. I found it worked best to put duct tape over the exhaust ports and bolt the manifold back on and then drill. I had no problem with this and no shavings got inside. It only took about 40 minutes to do all 8.

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post #7 of 11 (permalink) Old Feb 12th, 01, 7:47 AM
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Just want to remind you that there is a seat inside the hole you are going to try to drill. Had to drill out the old AIR tubes on the manifolds for our 71. Just be careful not to use too big of a bit/not to go too far into the manifold. I would drill out part of the center, apply heat/wax, and then use an easy out to try to get it to budge. Good luck!


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post #8 of 11 (permalink) Old Feb 12th, 01, 8:26 AM
RatMotor69
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I did this with my '81 GMC. I ended up removing the manifolds, soaking the plugs and heating them up. Took ALL day, but I got EVERY one of them out with no thread damage. My new air tubes went right in and tightened up just fine.

Rick

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post #9 of 11 (permalink) Old Feb 12th, 01, 2:19 PM Thread Starter
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Thanks guys for the responces,i know they have been in there awhile.Bad part about heating them is they have been powder coated.But that looks like the only i am geeting these plug out.Thanks again

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post #10 of 11 (permalink) Old Jun 23rd, 10, 3:14 PM
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Re: REMOVAL OF EXHAUST MANIFOLD PLUGS

You'll have much better luck using MAPP gas rather than propane - Much hotter!

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post #11 of 11 (permalink) Old Jun 23rd, 10, 5:28 PM
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Re: REMOVAL OF EXHAUST MANIFOLD PLUGS

Quote:
Originally Posted by 71-454 View Post
You'll have much better luck using MAPP gas rather than propane - Much hotter!
Dude I hope he has it fixed by now because it was posted on Feb 12, 2001.
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