Guest myfirstbuick Posted December 4, 2006 Share Posted December 4, 2006 Hello,I am in the process of assembling my '39 Special Mdl. 40 engine back together after a swap. Does anyone know if there is a tightening sequence for the exhaust manifold? I can't find anything in the service manual. Any help would be most appreciated! <img src="http://forums.aaca.org/images/graemlins/ooo.gif" alt="" /> Link to comment Share on other sites More sharing options...
Patrick W. Brooks Posted December 4, 2006 Share Posted December 4, 2006 Good Morning Neal: Yes, there is a very important sequence in tightening the nuts on the studs which hold the manifolds on the head. This is important to avoid binding which is magnified when the manifolds are heated during operation, especially the exhaust. The proper sequence reduces the binding and will aid in preventing your exhaust manifold from cracking. About two years ago I wrote an article in the Bugle about this with the factory diagrams showing the sequence. The recommended sequence changed over the years based on experience with cracking of the exhaust manifold and I believe the last recommended sequence is by far the best. Look for the article and if you cannot find it I will look it up and post it. Hope this helps. Thanks, Patrick W. Brooks. email: brooker50158@hotmail.com 641-753-9134 Link to comment Share on other sites More sharing options...
Guest 1937RHDNZ Posted December 4, 2006 Share Posted December 4, 2006 Hello Patrick,I am soon to replace my manifold gasket as well. So I would be keen to learn more, was your article ever posted on the web? If not, could you also send me a copy of the info. My email is posted in My Profile. Many thanks.Regards another Neil. Link to comment Share on other sites More sharing options...
Bill Stoneberg Posted December 4, 2006 Share Posted December 4, 2006 Pat,Please post the information as I dont seem to be able to find my copy of the Bugle where it is.Thanks for your help. Link to comment Share on other sites More sharing options...
Mark Shaw Posted December 5, 2006 Share Posted December 5, 2006 Pat, We would be interested in re-printing the article in the PWD newsletter. Please email a copy if you have one.Thanks,durcodude@comcast.net Link to comment Share on other sites More sharing options...
Guest myfirstbuick Posted December 5, 2006 Share Posted December 5, 2006 I've been in touch with Patrick and he has kindly offered to mail a copy of the article to me. Once I receive it I will scan and post it. Mark and "the other Neal" - I will send you emails of the article as I may be able to do that quicker than posting it! <img src="http://forums.aaca.org/images/graemlins/crazy.gif" alt="" /> <img src="http://forums.aaca.org/images/graemlins/ooo.gif" alt="" /> Link to comment Share on other sites More sharing options...
Guest Straight eight Posted December 6, 2006 Share Posted December 6, 2006 If I'm not mistaken start at the center and tighten one nut, then go to the next one to the front, and then one from the center to the rear, and alternate one towards the front, and one towards the rear. Just bearly tighten the first time starting at the center one towards the front, and one towards the rear. Repeat tightening a little more, and finaly once more starting at the center and spliting your tightening efforts one towards the front, and one towards the rear, and one towards the front, one towards the rear, etc. Link to comment Share on other sites More sharing options...
Patrick W. Brooks Posted December 6, 2006 Share Posted December 6, 2006 Hello All: The article is in the Jan., 2003, issue of the Bugle. I believe it was on page 16. It will be posted. Thanks, Patrick W. Brooks Link to comment Share on other sites More sharing options...
ncgirl05 Posted December 8, 2006 Share Posted December 8, 2006 As promised, attached is the aforementioned article.One question, Patrick, I was looking specifically for the exhaust manifold tightening sequence but I don't see it mentioned here, only the head - am I missing something?? <img src="http://forums.aaca.org/images/graemlins/confused.gif" alt="" />Thanks!(ooops - sorry, submitted under my girlfriend's userid - that's what we get for using the same computer...! <img src="http://forums.aaca.org/images/graemlins/crazy.gif" alt="" />)... Neal Link to comment Share on other sites More sharing options...
Patrick W. Brooks Posted December 8, 2006 Share Posted December 8, 2006 Hello: I was assuming to much and should have made it clearer. The procedure is the same in that you start in the center and work to the outside alternating sides. Pull them up very firmly and then go back in the same sequence for final tightening. Patrick W. Brooks Link to comment Share on other sites More sharing options...
Guest myfirstbuick Posted December 9, 2006 Share Posted December 9, 2006 Brooker,Thanks so much for clearing that up for me. It makes perfect sense and I'm going to work from your experience and apply it to my to my engine this morning. <img src="http://forums.aaca.org/images/graemlins/grin.gif" alt="" /> Link to comment Share on other sites More sharing options...
Guest JT Posted December 9, 2006 Share Posted December 9, 2006 In general, if I don't have a diagram for torquing something, I start at the center and work to the ends in an alternating or circular pattern in 3 stages. Link to comment Share on other sites More sharing options...
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