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Tool Talk Discussion Forum

Stainless Bolts for Exhaust Manifolds

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agrogers

07-19-2005 16:01:46




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Is there a problem using stainless bolts for things like exhaust manifolds and in other high temperature applications?

The reason I ask is I am not sure of the rate of expansion and contraction between the stainless bolts and cast iron cylinder heads. It would be sufficient to use whatever the man at the counter has in his parts book, but looking ahead I would like to prevent rusty bolts that don't like to come out when the time comes to take it apart again.

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Nolan

07-21-2005 03:05:33




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 Re: Stainless Bolts for Exhaust Manifolds in reply to agrogers, 07-19-2005 16:01:46  
I've had a number of vehicles with stainless nuts on the exhaust studs. They worked quite well. No problems with them walking off from expansion rate differences and the like.

I've also had some with copper nuts on the exhaust studs, and they to worked well.



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dab

07-20-2005 11:34:19




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 Re: Stainless Bolts for Exhaust Manifolds in reply to agrogers, 07-19-2005 16:01:46  
Just a note, just because it looks like copper or brass doesn"t mean it isn"t tough. There is allot of difference between tough and hard. There are allot of alloys that can be added to "toughen"" steel up. Also a note to the one who wrote about beryllium, be careful machining that, it is hazardous to breath. Just like magnesium chips will ignite if water is sprayed on them.



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Big Jim

07-20-2005 01:28:31




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 Re: Stainless Bolts for Exhaust Manifolds in reply to agrogers, 07-19-2005 16:01:46  
Stainless is notorious for galling on threaded parts. If its 1/4 inch or bigger, I always try to use anti-seeze. Probably not a good choice for manifolds.
A little side note: I had to take a choke stove off the exhaust pipe on a 30-year-old Koelher generator. With just a little care, the brass screws they used came out and I was able to reuse them. I try to always use brass nuts on manifold studs.

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720Deere

07-20-2005 03:33:55




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 Re: Stainless Bolts for Exhaust Manifolds in reply to Big Jim, 07-20-2005 01:28:31  
Stainless steel galling is not as much of a problem with other metals as it is with itself. We almost never use SS nuts on SS bolts because of this problem. Many times bronze nuts are used with stainless bolts and this works fine. I don't have any experience with SS and cast iron, but if you generously use anti-sieze you should not have any problems.



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Redmud

07-19-2005 18:54:48




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 Re: Stainless Bolts for Exhaust Manifolds in reply to agrogers, 07-19-2005 16:01:46  
Small mistake down below, The factory from which the copper bolts came, was the Grove Crane Company, not Navistar.



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Redmud

07-19-2005 18:28:58




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 Re: Stainless Bolts for Exhaust Manifolds in reply to agrogers, 07-19-2005 16:01:46  
Some of the older International truck engines used copper exhaust manifold bolts, We had several 450's and 501 inline 6 cylinders that had them from the factory. never would have though they would be strong enough, but I don't remember ever snap'n one off. And they were always easy to remove.



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Bob

07-20-2005 21:13:53




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 Re: Stainless Bolts for Exhaust Manifolds in reply to Redmud, 07-19-2005 18:28:58  
I think the "copper" bolts were simply steel bolts with a plating of copper on them. I have blown broken ones out of heads with a torch, and they cut like a normal steel bolt.



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Davis In SC

07-19-2005 20:30:18




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 Re: Stainless Bolts for Exhaust Manifolds in reply to Redmud, 07-19-2005 18:28:58  
I bet those bolts are a Copper-Berylium alloy. I have some CuBe hammers, sparkproof kind,& they are almost as hard as the steel ones..... .....



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Joe(TX)

07-20-2005 06:00:08




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 Re: Stainless Bolts for Exhaust Manifolds in reply to Davis In SC, 07-19-2005 20:30:18  
They may have also been brass. Plain copper is too soft for bolts.



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Easy

07-19-2005 22:04:52




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 Re: Stainless Bolts for Exhaust Manifolds in reply to Davis In SC, 07-19-2005 20:30:18  
I remember some bushings made of Ampco 18. Couldn't hardly scratch it with a file. I believe it's classed as a berilium bronze. Tough to machine. Easy.



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MarkB_MI

07-19-2005 17:17:38




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 Re: Stainless Bolts for Exhaust Manifolds in reply to agrogers, 07-19-2005 16:01:46  
Most stainless steel bolts are 304 stainless and will typically be weaker than SAE Grade 5 bolts.



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Jim in N M

07-19-2005 16:42:39




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 Re: Stainless Bolts for Exhaust Manifolds in reply to agrogers, 07-19-2005 16:01:46  
If you choose to use the same type bolts or studs you could use some "Never Seize" on them and they;ll come out easy later. Jim in N M



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The Ben

07-20-2005 06:10:56




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 Re: Stainless Bolts for Exhaust Manifolds in reply to Jim in N M , 07-19-2005 16:42:39  
Just to correct an error in the case of previously stated comment on copper nuts they would have to be off an ihc for the grove crane corporation did not make their own engines for the period we are talking about the lower engines were IHC while the upper engines ranged from detroits to fords to most anything



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