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Allis Chalmers Discussion Forum

B Ring Gear

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Rod (NH)

10-16-2003 08:39:49

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The starter on my B is not fully engaging a lot of the time. I believe the teeth on the ring gear are worn in the most used area. I am planning on fixing the problem later on this winter when I can split the tractor. I think my options are: 1) replace the ring gear or 2) remove the existing ring gear, rotate it (say 45 degrees) and reinstall it. I have not done this before and would appreciate some thoughts from those who have. How hard is it to get the existing ring gear off the flywheel? Can just some heating with an oxy/acet torch easily get the thing off considering the large heat sink the flywheel provides? Or is just easier to cut it off and replace it with a new one? Does a lot of heat have to be used on installation (such as the torch) or can just heating in a kitchen oven to 300 or 400 deg F be satisfactory? The oven method would provide a more even heat than the torch but might not be enough. Is there a natural ridge on the flywheel to positively locate the ring gear longitudinally or should I measure the position prior to taking the existing one off?

Thanks for any input.

third party image Rod

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Dave in MA

10-18-2003 17:20:30

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 Re: B Ring Gear in reply to Rod (NH), 10-16-2003 08:39:49  
I rotated the one on my C.It comes off the flywheel very easily using the oven method.You should have seen the look on my wifes face,when I put it in her new oven!Anyway,you only want it in there long enough to heat the ringgear and not the flywheel.After I got it off, I cleaned up the bad spots with my Dremel tool.
I rotated it quarter turn and put it back on using the oven again,just the gear not the flywheel.
You don,t have to worry about measuring anything ,it only goes on so far and thats it.
Make sure you pry it off straight and even.
Mine engages perfect every time,don,t forget to lube the bendix while its out in the open.

Good luck ,Dave

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10-18-2003 05:06:10

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 Re: B Ring Gear in reply to Rod (NH), 10-16-2003 08:39:49  
I usually can drive old ring gears off with a blunt chisel without having to use any heat. I have never tried the oven method of heating, I don't think you will expand it enough that way. Drive the old gear off and take the flywheel and ring gear to a shop that has a torch and have them heat and drive the ring gear on, it should not take more than 10 min. For my time spent I would install a new ring gear. Good Luck.

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