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Building A John Deere A Diesel?

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James

08-22-2002 19:26:56




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My dad has an old A that is setting in a fence row. When the tractor was first obtained it was stuck. We did get it running again but it has sence become stuck again. I am currently taking machine shop classes so I will have access to a machine shop. The teacher seams that he would be helpful on a project like this. I thought about running an injector pump from where the mag attaches. What kind and off of what I do not know. Also placement of the injectors, and do the cam specs need to be changed. I also have some ideas for higher compresson pistons. I know it can be done because I saw a picture of a B that had the same thing done to it. If anyone has some thoughts it would be a great help.

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Paul

08-22-2002 22:35:49




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 Re: Building A John Deere A Diesel? in reply to James, 08-22-2002 19:26:56  
If this is what you really want go for it probably not that much difference than building a big puller. your on track with pump any rotary pump ( stanadine?) 6.2 -6.5 6.9 -7.3 4010Jd whatever injectors through the middle of head.cummins 855 pistons????? ??? something a little smaller in dia. might be better 5"????? ????? . toughest part will be sealing injecors and fuel( timing nozzels pumps volume??) probably copy timing off the big diesels

r,70-840
best of luck

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Will P

08-22-2002 21:30:06




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 Re: Building A John Deere A Diesel? in reply to James, 08-22-2002 19:26:56  
I know a guy in my home town that has a "B" diesel. I think he used a Oliver 6 cyl. injection pump. I can't remember what he used for pistons. I will talk to him about what he did to his "B diesel"

Will P



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James

08-23-2002 16:24:18




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 Re: Re: Building A John Deere A Diesel? in reply to Will P, 08-22-2002 21:30:06  
Will if you could get as much information as possible that would be great. If an Oliver pump could be used I know where I could get one for nearly nothing. I also know of some places where I might be able to pick up a couple of injectors cheap (they will need to be checked though). On pistons I heard of a guy that for a pulling tractor to raise compresson he bloted round disk onto the top of the pistons (crude but effictive). I'm guessing that they will need recesses milled into them instead of having a flat top? If you get any more information feel free to e-mail me. thanks James

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G-MAN

08-24-2002 07:12:03




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 Re: Re: Re: Building A John Deere A Diesel? in reply to James , 08-23-2002 16:24:18  
I've heard of guys using spacers on top of pistons to raise compression ratio in gas tractors, but not diesel. That's not to say no one has done it, just that I haven't seen or heard of it. To fire the engine correctly, you're going to need a compression ratio in the neighborhood of 16:1 - or roughly 10 to 12 points higher than what it is now. That is going to put a tremendous load on your pistons, head gasket, and pretty much every other combusion-related component. My feeling is that you would be much better off finding a set of pistons out of a diesel engine. I believe Cummins was mentioned. Start doing your homework, as there is more than likely a diesel (Cat, Cummins, etc) that uses the approximate bore size you need. I would also seriously consider having the crankshaft magnafluxed, etc. Those internal components were never designed to deal with the stress and pounding that they will get running on diesel fuel. Or you could simply go buy a two-cylinder diesel for probably much less money than you're going to have in the "A", and end up with something that is factory engineered and stone reliable, rather than a tractor that you might end up wondering when something is going to fail. Projects like this are interesting in theory and practice, but once you get past the fact that it's running on diesel, it's still a JD "A". My two cents.

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Ralph

08-22-2002 20:47:27




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 Re: Building A John Deere A Diesel? in reply to James, 08-22-2002 19:26:56  
As beefy as those old JD were, I'm not sure the crankshaft is up to jumping to a 16:1 compression ratio. It will also mean a major overhaul of the starting system. I met a fellow who spent more on converting a 70 to electric start than he paid for the decent 70. You sound like a young fellow, don't lose sight of the fact that these usually turn out to be toys. Save the difference between restoring a gas and building a diesel and invest it in a house, the best investment you will ever make. The reason I have several is my investments paid off, but delaying buying a house cost me 30% of the cost of the house due to inflation.

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