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Tractor Talk Discussion Forum

Replacing pistons in 1945 John Deere Model B

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GLASS TRACTOR N

01-03-2008 07:03:41




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My son & I are restoring a 1945 JD Model B and I ordered .045 oversize pistons for it from what seems to be a very knowledgeable and helpful tractor dealership that deals in antique tractors. When I gave the pistons to the machine shop, they claim that the pistons are too tall by at least 1 1/2 inches and could hit the head. The dealership is attempting to put the machine shop in touch with the piston supplier to hash this out. Meanwhile I am in a real crunch for time, since this tractor has to go to an Ag Mechanics show in about six weeks. Any advice would be greatly appreciated.

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GLASS TRACTOR NOVICE

01-03-2008 12:56:06




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 Re: Replacing pistons in 1945 John Deere Model B in reply to GLASS TRACTOR NOVICE, 01-03-2008 07:03:41  
The piston supplier talked with the manufacturer and has been assured that the pistons are the correct ones. The supplier then talked with the machine shop and everyone seems content that they are indeed the correct pistons. Hopefully the problem is solved. Thanks.



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Mike M

01-03-2008 08:06:04




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 Re: Replacing pistons in 1945 John Deere Model B in reply to GLASS TRACTOR NOVICE, 01-03-2008 07:03:41  
Sounds like they may of sent LATE model B pistons ? What dia. are they ? But even gas pistons for that model I don;t think will be 1 1/2" taller.



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GLASS TRACTOR NOVICE

01-03-2008 08:17:04




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 Re: Replacing pistons in 1945 John Deere Model B in reply to Mike M, 01-03-2008 08:06:04  
The diameter of the pistons should be approximately 4 1/2 inches.



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Mike M

01-03-2008 11:40:03




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 Re: Replacing pistons in 1945 John Deere Model B in reply to GLASS TRACTOR NOVICE, 01-03-2008 08:17:04  
I put .045" oversize factory cast iron gas pistons in my 1945 B when I redid it a few years back found a NOS set from Greg Stephan. I wish I knew for sure how much higher they were ? 1 1/2" sure sounds like too much ? but I don't have a measurement or any old parts laying around for those anymore to check exactly.



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