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Allis Chalmers Discussion Forum

1939 Allis Chalmer B Help!

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05-19-2020 09:50:42

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Hello friends. I am trying to bring back an Allis Chalmers model B back to life. I have a few questions I was hoping someone could help me with.

This tractor does not appear to have a thermostat. Not sure if one was designed to go in the radiator hose? I understand some had a bypass. Not sure if I should put a thermostat in this tractor. I don't believe I have the 4 bolt housing, but the old 2 bolt housing.

This tractor leaks out of the front crackshaft seal. The new seal seems fairly cheap ($8) but not sure how to install. Most videos I have seen just show to pull the old one out and drive the new one in? Any tips or tricks?

Any tips on adjusting the brakes on this tractor? I didn't know if I could adjust the breaks to see if I have any pad left before I remove the wheel weights and tires. Perhaps pads are fine, just out of adjustment?

What paint do you typically use to restore your tractors? I was going to use Tractor / Implement paint but not sure if it will take the heat of the block (180 degrees). Any tips?

Thanks in advance to all your wisdom!

Talk soon

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Grandpa love

05-21-2020 16:17:06

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 Re: 1939 Allis Chalmer B Help! in reply to ksharpb, 05-19-2020 09:50:42  
My '39 B is hand crank only. I love the little tractor. Brush painted it with valspar Allis Chalmers paint. Love the hand brakes. What's your serial number?

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05-21-2020 04:57:46

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 Re: 1939 Allis Chalmer B Help! in reply to ksharpb, 05-19-2020 09:50:42  
Here is a link to the AC service manual for the G, B &C< and CA.


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Ken Loewenhagen

05-21-2020 04:48:36

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 Re: 1939 Allis Chalmer B Help! in reply to ksharpb, 05-19-2020 09:50:42  
You do not have to remove the tires to adjust or replace the brakes. Take the cover off where the brake levers go into the housing. You can see, adjust and, replace the brakes from there.

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Ted in NE-OH

05-19-2020 20:06:18

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 Re: 1939 Allis Chalmer B Help! in reply to ksharpb, 05-19-2020 09:50:42  
Some really early B's did not have a thermostat but would regulate opening or closing the radiator shutters. The crankshaft has a spiral groove that worked well with a felt seal which is no longer available. The spiral grove will eventually tear up the modern neoprene seals and then you are back where you started. The solution is to use a Speedy-sleeve to cover the spiral groove.

The original paint was called Persian Orange #1. The spec.number is PPG 800080 available at auto parts stores. Good luck

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05-19-2020 14:53:20

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 Re: 1939 Allis Chalmer B Help! in reply to ksharpb, 05-19-2020 09:50:42  
The best thing you could is buy a set of manuals. Operators, repair, and parts. The parts manual is useful even if you don't use it to order parts as it shows how the parts relate to each other. They aren't hard to find, this site may even have them.

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