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John Deere Tractors Discussion Forum
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1936 John Deere B pistons

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Beau Henderson

01-28-2007 14:33:29




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I am in need of help. I recently bought a 36' JD B with a stuck motor. This tractor according to the owner has set for about 40 years without running. I am almost positive that when I remove the pistons I will break them. So my question is can I replace them with a later model B piston (sn#60000-59999 4.5 in bore.) or is there an outlet where I can buy new pistons for this model tractor. Any help or advise on this would be really helpful.

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tractorfixer

01-29-2007 07:13:38




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 Re: 1936 John Deere B pistons in reply to Beau Henderson, 01-28-2007 14:33:29  
Hey guys, has anyone tried electrolysis to get pistons out of a rusty block?



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CalJim

01-28-2007 22:06:00




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 Re: 1936 John Deere B pistons in reply to Beau Henderson, 01-28-2007 14:33:29  
The 4 1/2" pistons cannot be used in your 36.
Do everything you can to save those pistons,
trust me they are not available. I broke one
in my 36 and tried finding a used set at .045
over. Had a half dozen used pistons sent to me,
they were either cracked or warped. Finally
found a set of std. size, had to sleeve the
block. You can try Hinrichs but that size is
not always stocked there. CalJim

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johndear

02-03-2007 21:57:29




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 Re: 1936 John Deere B pistons in reply to CalJim, 01-28-2007 22:06:00  
I have to beg to differ with you on the 4.5 pistons not working. I have the 4.5 pistons in my US B. Bored the block .250" and stuck em in. There are two different sets of 4.5 pistons depending on year. The first year of the 4.5's shared the same piston pin diameter as your US B. Then Deere went to a larger pin. You can have a machine shop make bushings and reuse your smaller pins. I have an extra set of 4.5 pistons with the larger pin. If you have a friend in a machine shop you can probably acquire the needed bushings pretty reasonable. $500 or $600 will get you set of custom made pistons so even if you can't find some originals there is still light at then end of the tunnel.

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Mike M

01-28-2007 19:06:40




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 Re: 1936 John Deere B pistons in reply to Beau Henderson, 01-28-2007 14:33:29  
It just might suprise you ? I've had some that were pretty nasty and I pulled the block with the pistons in it stood it up and soaked it in diesel,the longer the better. Then you take some blocks of wood and a sledge and drive them down and out the bottom. One time I speeded up this process by heating up the block by sticking a hot water pressure washer in the cooling passages. If the pistons are still good and the bore is bad you can have it sleeved.The top ring usually stops most of the water and keeps it trapped up top when those lock up.

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Larry806

01-28-2007 18:52:12




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 Re: 1936 John Deere B pistons in reply to Beau Henderson, 01-28-2007 14:33:29  
You can try what old said I have seen that work. But I've also worked on several ( dozens) of tractors that needed a lot more to get them loose. Your B you can pull the head and unbolt the rods. becarefull to keep track of the shims. than unbolt the block with pistons in it. If you know someone with a press that's the way to go. Now be for warned I've saw the " sleeve" part of the block crack when pressing badly rusted pistons. Most likely if its rusted that bad is not going to matter. I've done several blocks where I have to sandblast above & below the pistons before pressing.. Other option is pull the block , stand it up on blocking get a 4x4 & sledge
Please let us know how it goes

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old

01-28-2007 16:56:17




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 Re: 1936 John Deere B pistons in reply to Beau Henderson, 01-28-2007 14:33:29  
You never know it may pop loose for you I have a JD-B that say for 15 years locked up and it popped loose and also another tractor that sat for 25-30 years and it also popped loose. Fill the cylinders with tranny fluid and just keep topping them off. One thing that helps a lot on a JD is if you can get the front end up about 2 foot so the fluid gets to the top of the pistons better, thats what I did on this B I have. I didn't even pull the head off of it and it runs well now.

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