Broken head bolt

Farmall M, Super M, 400, 450 & 560 Tractors, 1939-1963

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offrink
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Joined: Thu Jan 02, 2014 4:23 pm
Zip Code: 49316
Tractors Owned: 1954 farmall fcub, 1954 farmall super m
Location: Caledonia, MI

Broken head bolt

Postby offrink » Fri Sep 22, 2017 8:06 pm

So while retorquing a head bolt I snapped it. About a half inch of thread is left in the bolt hole and it's about 1/4"-1/2" into the block. Do I need to drill/ez out the remainder of it out and replace it or can I leave it. If I need to take it out do I have to take the head back off or is there a trick? Just really don't want to have to redo my last two days of work.

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John *.?-!.* cub owner
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Zip Code: 63664
Tractors Owned: 47, 48, 49 cub plus Wagner loader & other attachments. 41 Farmall H.
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Re: Broken head bolt

Postby John *.?-!.* cub owner » Fri Sep 22, 2017 8:52 pm

My first suggestion is to take the head back off, and use a vice grip pliers with good teeth to grab hold of it and try backing it out. Actually, My first try would be to use a bolt out and impact wrench, but not everybody has the bolt outs. Also it is always a good idea to run a tap into all head bolt holes to clean the threads ans mae sure there is nothing in the bottom when installing a head.
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staninlowerAL
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Re: Broken head bolt

Postby staninlowerAL » Fri Sep 22, 2017 8:55 pm

If it were mine I would remove the broken bolt. You can leave the head in place and use the hole as a guide to center the drill bit with some bushings. Don't use ez out, if you break one you've got MAJOR Problems. Get some left hand drill bits and you may get lucky and back the remaining piece of the bolt out when drilling.

offrink
5+ Years
5+ Years
Posts: 379
Joined: Thu Jan 02, 2014 4:23 pm
Zip Code: 49316
Tractors Owned: 1954 farmall fcub, 1954 farmall super m
Location: Caledonia, MI

Re: Broken head bolt

Postby offrink » Thu Jan 25, 2018 6:38 pm

Well that is exactly what I ended up doing. Too a drill bit that was the same size as the bolt hole. That made a spot that was dead center. I used a left handed drill bit and then stepped up to the next size drill bit. I ended up only having the option of buying them as an easy out left drill bit combo. I cut them in half with a dremmal cut off wheel. Then put them in an 8” extension. Took about 20 minutes of drilling but it came out like butter once it was loose!


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