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Exhaust manifold to pipe bolts (PIX ADDED 12/22)

656 Views 8 Replies 4 Participants Last post by  DOABLE
It's 12/22 and I have added relevant stuff at the end of this post. read the whole topic and look at the pictures.
(Written 12/12)--This week, when we were R&R'ing the clutch, we sure felt lucky to get out the two bolts that fasten the exhaust pipe to the manifold. We put the old bolts back in because we hadn't thought far enough in advance to have new replacements for them. They sure seem like odds-on candidates to snap off next time around. So the question is: what do you think the absolute BEST replacement bolt would be for this application? Also, please include the size, length and thread for this metric-challenged guy.


PS--I didn't do a search before posting this topic--30 lashes with a greasy shop towel!
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Re: Exhaust manifold to pipe bolts

Easiest bestest way - replace the bolts with studs - then use brass nuts on them -- with anti-sieze.

Then even if the studs do rust in, the brass nuts come off easy even many years later. The brass is soft enough that they won't gall the theads on the steel studs.

Muffler shops have the brass nuts.

Oh, use a flat washer under the brass nut, then double nut it with another brass nut, so they won't come loose.

Lockwashers, like split or star washers only work when it's loose. Think about it - when the washer is compressed, the sharp edges don't/can't dig in.
Nylocks aren't made in brass, and I have no idea where to find splitlock nuts in brass.
Re: Exhaust manifold to pipe bolts

The problem with anti-seize alone on steel nuts and studs is it eventually evaporates, leaving just the graphite - but the graphite itself doesn't stop the rust.
It's OK if you frequently remove them - like every year, but anti-seize on exhaust - hot, corrosive - doesn't last long.
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