John Deere B

Jcip · Mar 5, 2013

Good day! I am working on a 1939 John Deere B. I have 4.500 dia bores and 1 1/4 dia wrist pins. I had an issue with crankshaft (splines for clutch shot) so I bought a used crank supposedly from a 1940 B. The mains on this crank measure 2.750. My old mains were a lot smaller, did not measure, but likely 2.500 or less. So I bought 2 used connecting rods to fit this crank. I now have 2 rods that fit mains, but now my wrist pins are wrong. The pistons I have sport a 1 1/4 dia wrist pin, while the rods I bought have a 1 3/8 dia wrist pin bore. My question is, can I buy 4.500 dia pistons with 1 3/8 wrist pins or should I just go ahead and make oversize bushings for the new rods and put it together. I also need to find a new set of rings, all of my normal suppliers have 4 11/16 dia rings for a later model. Any help will be appreciated, John

rick deere · Mar 5, 2013

the 39 was a tractor of its own for the most part lots of parts will not work on that yr modle.good luck

jdfun · Mar 5, 2013

Sounds like the hole your digging is getting deeper and deeper. If your orginal block, rods and etc. were ok , just get the correct crankshaft. Now my sales pitch, I parted out a 1940 B (ser 89xxx) I have a crankshaft with good splines . If I can be of any help contact me be email or call 573 535 8952, Tom.

Mike M · Mar 5, 2013

Sounds like You will be farther ahead to fix the splines on the one you had unless the journals are shot ?

Also sounds like you got a crank from one just a wee bit too new.

Patsdeere · Mar 6, 2013

In case you can't find rings anywhere else, this guy should have them.
Rings?

John Deere B

Jcip

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rick deere

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jdfun

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Mike M

Well-known Member

Patsdeere

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