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Thanks, all ! Here's what I did:
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Posted by Mark in Marine [Email] (#1837) [Profile/Gallery] (more from Mark in Marine) on Fri, 13 Jul 2018 21:15:33 Share Post by Email
In Reply to: Advice on Studs for Exhaust Manifold ? 4 Questions . . ., Name Left Blank, Fri, 13 Jul 2018 00:25:38
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I used all short Stainless Steel studs from Genuine SAAB - not ARP but the less expensive ones. Visually the quality seems good, the washers and nuts seem to be quality as well. I used red Loctite on the studs and torqued them to 18 lb-ft, then I did the same with the nuts. I couldn't find any order for tightening exhaust studs, so here is how I did it:

I decided to go 'center out', but was not sure about doing the shared stud first, so I began with the lower stud of of cylinder #2, then lower stud of cylinder #3, then the upper stud that #2 and #3 share, then upper stud of cylinder #1, then upper stud of cylinder #4, then lower stud of cylinder #1, and finally lower stud of cylinder #4. I followed the same pattern with the washers & nuts and again used red Loctite and 18 lb-ft. I was torn between posts on Stainless studs coming loose when install with anti seize or no treatment, and the posts that emphasized high-temp anti seize. I did use high temp (ceramic) anti seize on the studs and nuts for the turbo - but that's the iron castings and black oxide steel studs with copper coated nuts. I think the ceramic anti seize is marketed as nickel replacement because 1) it's 'new' and 'different' and 2) because finely divided nickel has become an EPA and OSHA toxicology concern.

We will see how this holds up - and how the heat shield manages with a couple homemade clips and the single nut.

My final thought - if your turbo-to-manifold gasket is leaking, there is a good chance the exhaust gasket is not far behind and you should be looking for broken or missing studs at the manifold as well. I would have saved myself a lot of grief if I had not tried to save time by avoiding taking off the exhaust manifold. If I had noticed the broken stud first, I wouldn't have had to remove and re-install the turbo, with all of it's hard-to-reach plumbing.

At least the job is now nearly finished, and I can return the car to my daughter. Thanks for all your assistance !

Mark in Marine


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