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Manifold bolts

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Charlie C.

04-27-2008 09:03:50




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I have replaced the exhaust manifold on my 4000, from a horizontal to a vertical.
I reused the bolts that held the old manifold on but I want to replace those bolts with new ones.
What grade of bolt should be used? Just the standard bolt, Grade 5 or maybe grade 8. I am thinking just the standard grade.




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RodInNS

04-27-2008 18:31:22




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 Re: Manifold bolts in reply to Charlie C., 04-27-2008 09:03:50  
I wouldn't change them unless the heads are rounded. Those bolts are quite strong....
If I was changing them I'd price them from NH, then I'd price a good quality Grade 5 black bolt from a hardware supplier rather than a zinc plated bolt which is common in most places. I wouldn't use the zinc plated bolt on that unless I was dead stuck... which is why I suggest leaving it alone.

Rod



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Charlie C.

04-28-2008 14:15:17




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 Re: Manifold bolts in reply to RodInNS, 04-27-2008 18:31:22  
Rod I don't like to reuse bolts for the exhaust system due to the repeated heating and cooling.
I had to make a trip into town this morning and I picked up a set of G5 black bolts as you suggested.

Thanks guys for the input.



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Charlie C.

04-28-2008 19:34:47




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 Re: Manifold bolts in reply to Charlie C., 04-28-2008 14:15:17  
Along with the request for information I need some help here on mounting the muffler to the manifold. The manifold and the complete muffler and pipe are the two items that I purchased.

The third picture gives a little clearer picture of the cup that is on the end of the exhaust pipe. The pipe slides down into the manifold and the cup slides over the outside of the manifold.

When they are mated together the muffler will move around some, it is loose on the manifold. The cup is a solid piece so it does not look like it would take a muffler clamp. The one shown in the picture has some notches in the edge, mine does not, it is smooth around the bottom edge.

Any of you who have used this set up please tell me how you got the exhaust pipe anchored to the manifold so the muffler and exhaust manifold are a solid unit.

third party image

third party image

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RodInNS

04-28-2008 19:39:55




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 Re: Manifold bolts in reply to Charlie C., 04-28-2008 19:34:47  
Take a look at it for fit, but the last one I did had some taper too it. I just set the intermediate pipe in place and noticed that it had a good ways to go down before it set up. That was done with a 2x4 over the end up the pipe to soften the blow from a good sized hammer. That's all I did....

Rod



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Charlie C.

04-29-2008 09:48:38




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 Re: Manifold bolts in reply to RodInNS, 04-28-2008 19:39:55  
Thanks Rod, I never thought that the pipe might not be all the way down.



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MarkB_MI

04-27-2008 12:00:26




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 Re: Manifold bolts in reply to Charlie C., 04-27-2008 09:03:50  
I would not use anything less than grade five for any critical part. The quality of hardware is so bad these days that grade 2 bolts cannot be trusted.



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Fordfarmer

04-27-2008 10:00:15




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 Re: Manifold bolts in reply to Charlie C., 04-27-2008 09:03:50  
NH website parts list specs grade 5, probably to help prevent twisting them off the next time they're removed.



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john in la

04-27-2008 12:17:16




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 Re: Manifold bolts in reply to Fordfarmer, 04-27-2008 10:00:15  
This is pretty much what I was thinking.

A harder bolt will be less likely to break off when your great grand child tries to rebuild grandpaws tractor.



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Brian Allen

04-27-2008 09:12:22




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 Re: Manifold bolts in reply to Charlie C., 04-27-2008 09:03:50  
Standard grade is more than enough for this application, the use of anti seize is recommended.
Be tractor safe
Brian



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Brian Allen

04-27-2008 16:42:00




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 Re: Manifold bolts in reply to Brian Allen, 04-27-2008 09:12:22  
Sorry for the confusion, I use grade 5 as a standard. Grade 8 or harder for important things.
I should have specified the grade.
Brian



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Charlie C.

04-27-2008 16:50:24




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 Re: Manifold bolts in reply to Brian Allen, 04-27-2008 16:42:00  
Thanks Fellows for the help, Grade 5 it is.

Brian I always us anti-seize on things such as this. Having worked in an oil refinery in another life where every thing is hot, I did learn that.:-)

Ford thanks for the NH parts. Just was not sure what G5 meant. :-( I found what I was missing, G5 is the grade.



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Brian Allen

04-27-2008 17:23:54




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 Re: Manifold bolts in reply to Charlie C., 04-27-2008 16:50:24  

Did you like working there?
I worked as a Millwright for 4 years in a Shell oil refinery here in Ontario.
I was unhappy when they decided to close as I really enjoyed working there.
Be tractor safe.
Brian



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Charlie C.

04-27-2008 17:32:01




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 Re: Manifold bolts in reply to Brian Allen, 04-27-2008 17:23:54  
Brian I work for Shell Oil in Demeangus Calif (spelling)from 1965 to 71. I did not mind the work as much as I did living down there. I am a country boy.I was an operator for a couple of years than became a machinist.



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