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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

Case 450B exhaust manifold bolts BROKE OFF HELP

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Gary in TX

07-08-2007 08:02:40




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Hey guys, I have a 450B dozer with exh. manifold bolts brok off in the head. Looking for options on getting them out and getting new ones in. I allready have new gaskets, muffler, a few new bolts and should be ready to rock and roll with the repair. Any ideas other than drilling out, eze outs, or retapping the holes.




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Jiles

07-09-2007 13:41:24




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 Re: Case 450B exhaust manifold bolts BROKE OFF HELP in reply to Gary in TX, 07-08-2007 08:02:40  
If you don't replace all of them, they will break again, only sooner!



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Gary in TX

07-08-2007 21:18:17




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 Re: Case 450B exhaust manifold bolts BROKE OFF HELP in reply to Gary in TX, 07-08-2007 08:02:40  
Hey Guys,
Thanks for the tips, worked on the ole girl today. 3 out of 5 bolts were broke off flush or just below the surface. The front two came out pretty easy with the eze out, I never could get a bit to take a bite on the center stud so I just put her back together with the two on each end and let the center take care of itself. She sounds so much better now!
Thanks again!



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NCWayne

07-08-2007 18:14:41




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 Re: Case 450B exhaust manifold bolts BROKE OFF HELP in reply to Gary in TX, 07-08-2007 08:02:40  
Being a mechanic by trade I"m always faced with broken bolts in the worst places possible. If all the "conventional" methods fail, I"ve found for the smaller, average sized bolts( meaning around 7/16 and down to 1/4) the best way to remove them is to start by drilling a hole all the way through the stuck piece. If you start with the welded washer/nut method and move onto an easy out with no results then you"ve already got a hole through the bolt so your half way there. This method works best if the hole is all the way through the piece but as long as it"s "most" of the way through it will typically still work. That said I use a carbide burr to eat away at the remaining material til it"s thin enough to peel out of the hole. The burrs I"ve got have a 1/4 shank and a 5/32 burr head (and you can get smaller) so I can typically get out any bolt large enough to get a 7/32 hole in. I recently removed six bolts from the head of a B series Cummins this way and was able to salvage the threads in all the holes. When possible I always try the conventional ways first but when none work this is the best way I"ve ever found to get a stubborn bolt out. Good luck.

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Tpilgrim

07-08-2007 17:51:54




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 Re: Case 450B exhaust manifold bolts BROKE OFF HELP in reply to Gary in TX, 07-08-2007 08:02:40  
Drill a hole in the stud and try an easy out if you can. If that doesn't work buy some 3/32 stud puller rod from Xergon or 420s from UZ products or other equivalent and weld on the end of the stud were the hole is. The heat and the metal contracting in the hole will loosen the stud. When the hole is full weld a nut to the material that you welded in the hole. Let it cool and put a wrench on the nut you welded on and wind it out. Don't get discouraged if it doesn't work the first time. This procedure has worked many times for me and saved alot of money and time.

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135 Fan

07-08-2007 09:01:44




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 Re: Case 450B exhaust manifold bolts BROKE OFF HELP in reply to Gary in TX, 07-08-2007 08:02:40  
If they are broke off flush, either weld a nut onto it through the hole in the nut or if that is too small a hole, take a piece of 1/8 or 3/16 flat bar about 6 inches long, and drill a hole near one end so it can be welded on the broken stud. This usually works very well as the extreme heat from welding expands the stud and then it shrinks when it cools a bit making it come out easy. You should use the strongest welding rods like 7018 but other rods may work also. Dave

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steve n carol

07-08-2007 08:10:46




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 Re: Case 450B exhaust manifold bolts BROKE OFF HELP in reply to Gary in TX, 07-08-2007 08:02:40  
I read in the FORD forum a few weeks ago about using a cutting torch on the broken stud. I have never done this...yet. Those that posted said that the broken stud will melt out before the cast iron....I think I like this idea, However, I would practice on some 'junk' head...sl



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