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F20 exhaust manifold stud replacement


 
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ryanmor24
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Joined: 05 Dec 2018
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PostPosted: Wed Dec 05, 2018 11:28 am    Post subject: F20 exhaust manifold stud replacement Reply to specific post Reply with quote

How hard is it to get an original exhaust manifold apart on a '35 F20 without cracking it? I broke off a stud and would like to replace it. See the pictures. I am only concerned since its the dual fuel manifold and not replaceable.



 
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Loren in Iowa
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PostPosted: Wed Dec 05, 2018 11:51 am    Post subject: Re: F20 exhaust manifold stud replacement Reply to specific post Reply with quote

You might try to replace the stud without disassembling the manifold. Weld a nut onto the
top of the broken stud. The weld won't stick to the cast manifold. The heat from welding
might allow the stud to come loose. Carefully work the nut back and forth, and the stud
should come out. Run a tap into the hole, to clean out the threads.
 
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rustred
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PostPosted: Wed Dec 05, 2018 4:48 pm    Post subject: Re: F20 exhaust manifold stud replacement Reply to specific post Reply with quote

you will be pulling manifolds apart and drilling and tapping holes. or a machine shop will.
 
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SadFarmall
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Joined: 17 Jan 2011
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Location: Bullengarook, Victoria, Australia

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PostPosted: Thu Dec 06, 2018 2:13 am    Post subject: Re: F20 exhaust manifold stud replacement Reply to specific post Reply with quote

I use a local engineer, who has a Sparkerator, which uses a sacrificial piece of copper to spark out whatever you want to remove. Whatever size and shape the copper, that is what the machine sparks out. Then you can remove the remains of the thread with long-nosed pliers. There is zero risk of damaging the cast iron, unless you drop it. I have had various tractor and IHC mower parts worked on this fashion, as nuts, bolts and studs are cheap and the cast iron parts are not.
SadFarmall
 
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moll
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PostPosted: Thu Dec 06, 2018 11:37 am    Post subject: Re: F20 exhaust manifold stud replacement Reply to specific post Reply with quote

Also, when I weld removal nuts I first weld a flat washer to the broken bolt, this makes
a better weld. Then I weld the nut to the washer. Only thing is, it has to work after
that because if it doesn't you can make the stud hard to drill.
 
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