Printable Version of Topic

Posted by: raw1298 Oct 30 2011, 09:55 AM

I am digging in and removing the heat exchangers and was wondering if there are any tricks or things to watch for? I don't want to damage the heads in the process.

Posted by: AZ914 Oct 30 2011, 10:13 AM

Use a bunch of penetrating oil on the head studs. You really don't want those to break.
Some people say to use heat but I haven't done that personally.

Posted by: rjames Oct 30 2011, 10:14 AM

Be prepared for a stripped exhaust stud or two, either upon removal or reinstallation.
Make sure you have new gaskets and the correct nuts when it comes time to re install. Pelican has them.

Posted by: raw1298 Oct 30 2011, 10:18 AM

I am going to use penetrating oil. The engine was a fresh rebuild in the parts car when I bought it. I am hoping they were replaced with new studs and nuts in the process. Should I support the rear of the exchanger when I start to loosen the nuts on the head?

Posted by: tradisrad Oct 30 2011, 10:19 AM

anneal the new gaskets before using them. don't let the weight of the muffler and HE hang off of the studs.

Posted by: raw1298 Oct 30 2011, 10:22 AM

Anneal? Redneck from Kansas, please define?

Posted by: dlee6204 Oct 30 2011, 10:30 AM

Heat the new copper gaskets to red hot and let them cool slowly. They will soften up and seal better.

Posted by: raw1298 Oct 30 2011, 10:36 AM

Thanks! Going to start, let you know how it goes later.

Posted by: Tom_T Oct 30 2011, 10:46 AM

Make sure to support the full weight of the HEs & muffler in several places during removal & reinstall, so you don't tweak/strip the case studs by it dropping or it sitting crooked.

Posted by: pete000 Oct 30 2011, 10:56 AM

I just pulled mine yesterdy. I removed the muffler to reduce the weight a bit.

I soaked the studs with PB Blaster every day for three days. The nuts all came of easily. I noticed I had one missing copper gasket and one nut was very loose causing a slight leak.

Overall they came off easily

Posted by: raw1298 Oct 30 2011, 12:05 PM

Done. All nuts came out easy. There were no washers in there, are there supposed to be? The nuts also were not very tight.

Posted by: rjames Oct 30 2011, 12:23 PM

They were probably loose because they were the wrong kind of nuts.
Don't use washers. But do use the correct nuts:

http://www.pelicanparts.com/cgi-bin/smart/more_info.cgi?pn=11-62-1-711-954-M58&catalog_description=Exhaust%20Nut%20%288%20per%20car%2C%20sold%20individually%29%2C%20914%201.7%2F1.8%2F2.0%20%281970-76%29%2C%20Each

Don't over tighten the nuts when installing or you'll strip the threads for the studs. I think 18 ft lbs is the correct amount, but check the Haynes manual to be sure.

Posted by: raw1298 Oct 30 2011, 12:38 PM

Thanks, you are right they were the wrong nuts. I will get the correct ones when I reinstall.

Posted by: messix Oct 30 2011, 12:44 PM

use a 1/4" drive rachet to resist the urge to over tighten the nuts.

Posted by: rfuerst911sc Oct 30 2011, 01:05 PM

I'm a fan of adding some anti-seize compound on the threads of the studs to make it easier in the future to remove the nuts.

Posted by: raw1298 Oct 30 2011, 06:33 PM

When I go back in I'll put anti seize on it. Thanks for al the advise.