Bolt size. For dogleg

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Dusty B
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Bolt size. For dogleg

Postby Dusty B » Tue Aug 01, 2017 10:05 pm

Want to tap threads (paint) to reattach doglegs what's the correct thread size?? Thanks! Dusty B
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Re: Bolt size. For dogleg

Postby Bob McCarty » Tue Aug 01, 2017 10:10 pm

10-24 x 1/2". Dusty, anytime you need a bolt size, you can go to the parts manual and it will be listed with the part that it attaches or attaches to.
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Dusty B
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Re: Bolt size. For dogleg

Postby Dusty B » Wed Aug 02, 2017 7:01 am

OK - Thanks Bob!
Grandpa's '41 B
'56,,'57,'59,'71 Cub
'51 Super C
'55 Case SC
Fairbanks-Morse 3KW Generator
Dad's DB garden tractor
'48 DeSoto
'31 "A Coupe
'51 Ford PU
'55 Dodge PU
God looks out for those of us who don't know how to look out for ourselves!

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Re: Bolt size. For dogleg

Postby inairam » Wed Aug 02, 2017 8:00 am

Dusty, it is very good idea to chase those threads with a tap and I even put a little light lube on them. Snapping one of the small screws in the bolster leads to a not very fun time drilling and tapping which is especially difficult on the steering side.
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Re: Bolt size. For dogleg

Postby John *.?-!.* cub owner » Wed Aug 02, 2017 11:35 am

Be very careful if you have to drill one out, the water jacket is behind them. I saw one once that had tefflon tape on it to stop the water leak. Gave me a surprise when I removed the screw to tkae the dog leg off. The front of my pants looked a little embarrassing, antifreeze does not dry very fast.
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Re: Bolt size. For dogleg

Postby Dusty B » Wed Aug 02, 2017 9:29 pm

Thanks! Surprisingly the holes are pretty good. one of the bolster bolts has been drilled and tapped to a larger size?? Dusty B
Grandpa's '41 B
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Fairbanks-Morse 3KW Generator
Dad's DB garden tractor
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Re: Bolt size. For dogleg

Postby Randy Tuura » Tue Aug 08, 2017 4:43 pm

Chasing with a tap - on sizes a quarter inch and less is very risky. A tap can seize and break before you know there is a problem. Get a socket head cap screw the size of the threads you want to chase and take your Dremel hand grinder and grind a groove from the tip of the bolt to 3 or four threads. Turn it in, back it out, turn it in, back it out blowing or brushing off the dust and chips removed from the hole.
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Re: Bolt size. For dogleg

Postby staninlowerAL » Tue Aug 08, 2017 6:40 pm

Randy Tuura wrote:Chasing with a tap - on sizes a quarter inch and less is very risky. A tap can seize and break before you know there is a problem. Get a socket head cap screw the size of the threads you want to chase and take your Dremel hand grinder and grind a groove from the tip of the bolt to 3 or four threads. Turn it in, back it out, turn it in, back it out blowing or brushing off the dust and chips removed from the hole.

Agreed Randy. I had the misfortune to break a tap on one of the dogleg screws. Not a fun day.

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Re: Bolt size. For dogleg

Postby Ohiowoodchuck » Tue Aug 08, 2017 7:23 pm

I drilled and taped mine to 1/4 -20. There is to much weight on the front for them little screws to hold.

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Re: Bolt size. For dogleg

Postby Bob McCarty » Tue Aug 08, 2017 7:30 pm

Ohiowoodchuck wrote:I drilled and taped mine to 1/4 -20. There is to much weight on the front for them little screws to hold.

The front of the hood should have a bracket on either side that attaches to the top of the radiator supports. With them present, there is minimal weight on the dog legs. Without them, the doglegs often bow out and break or crack a bolt or the dogleg.
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Re: Bolt size. For dogleg

Postby Glen » Tue Aug 08, 2017 9:24 pm

Hi,
Below is a listing at TM Tractor showing the hood brackets. There are pics there that show where they go on the hood also.
The Cub parts manual says they use a 5/16" x 1/2" long bolt to hold them on the radiator support. They have to be short bolts, the radiator is there. It is at number 3 in the parts pic below. :)

http://www.tmtractor.com/new/fl/827fp.htm

http://www.farmallcub.info/manuals/cub_ ... 013-02.jpg

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Re: Bolt size. For dogleg

Postby Eugene » Tue Aug 08, 2017 11:17 pm

http://www.tmtractor.com/new/fl/827fp.htm

My Cub is strictly a work tractor. I purchased the brackets shown above, bolted the brackets to the radiator support, c clamp, set hood in place, drilled a hole in the hood and matching the bracket. Bolted the hood to the bracket. Yup, the head of the bolt shows on the side of the hood.

If you have a trailer queen, you will need to weld the brackets to the hood.
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Re: Bolt size. For dogleg

Postby Alan Riley » Wed Aug 09, 2017 10:32 am

I retapped mine to receive 12-24 screws. Since the thread pitch was the same, it was just a matter of deepening the existing 10-24 threads.
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Re: Bolt size. For dogleg

Postby clemk » Wed Aug 09, 2017 11:29 am

Randy Tuura wrote:Chasing with a tap - on sizes a quarter inch and less is very risky. A tap can seize and break before you know there is a problem. Get a socket head cap screw the size of the threads you want to chase and take your Dremel hand grinder and grind a groove from the tip of the bolt to 3 or four threads. Turn it in, back it out, turn it in, back it out blowing or brushing off the dust and chips removed from the hole.


I like this idea alot. Does anybody think it should be put in the Shop Tips forum?
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Re: Bolt size. For dogleg

Postby Ohiowoodchuck » Wed Aug 09, 2017 8:57 pm

Bob McCarty wrote:
Ohiowoodchuck wrote:I drilled and taped mine to 1/4 -20. There is to much weight on the front for them little screws to hold.

The front of the hood should have a bracket on either side that attaches to the top of the radiator supports. With them present, there is minimal weight on the dog legs. Without them, the doglegs often bow out and break or crack a bolt or the dogleg.

I don't believe mine ever came with them. There is no sign of them ever being on there. There is a rubber pad that goes on top of the radiator then the good/tank sit on it. Mine is around a 50 model and has the wire mesh grille.


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