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JD Model 40 Rebuild Information

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BIG

09-20-2000 16:03:17




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I have a 2 cylinder Model 40 John Deere that I am going to rebuild. The motor runs terrific and has good oil pressure but uses lots of oil. I have not torn into the engine but I am hoping I can get away with simply honing the block to put a good crosshatch in it and install new rings. My qestions are: 1)Is it feasible that this is all I will have to do or is it likely that I will need to rebore and put in new pistons? (I realize this is impossible to answer without tearing into the engine but maybe someone out there knows a history on this particular engine and how vulnerable they are to block wear, etc. 2)Where is a good reputable place for me to buy these internal engine parts? (full gasket set, rings, maybe pistons) Is the dealer way higher than all other places? I live in East Texas and don't mind using a mail order place if they aren't a "fly-by-night" type operation. Thanks for any advice and suggestions you can give. Also, does anyone have a copy of a service manual for this tractor they would like to sell or the I&T Service Manual JD-4 they would get rid of? I need something to guide me while I do the engine rebuild.

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Kerry Miller

09-21-2000 07:39:38




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 Re: JD Model 40 Rebuild Information in reply to BIG, 09-20-2000 16:03:17  
Where are you in E. TX? I'm about 40 miles east of Dallas near Greenville. There's a tractor junkyard/parts place in Commerce called Broke F. I don't know exactly what tractors they've got but it might be worth a phone call or a drive over there if you're not too far away.

Besides, it's interesting just to look around!

Kerry



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BIG

09-21-2000 08:59:00




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 Re: Re: JD Model 40 Rebuild Information in reply to Kerry Miller, 09-21-2000 07:39:38  
Kerry, thanks for the tip on the tractor yard - I would absolutely love to go look around there. Let me say that my wife's grandfather is the fellow with the JD40. He also has a Farmall Super A. He and his tractors are both in Gilmer, Tx. I am from Gilmer but just moved to the Dallas area a few months ago (wife took job here). I said I was in East Texas because all the work will be done in my father-in-laws shop in Gilmer. I get out of this town every chance I get and go wrench on everything from old tractors to my old Toyota Landcruiser. Do you know if the tractor yard you referred to is open on Sat? Please give me directions to it. I know where Greenville is relative to Dallas, just need specifics to get to the yard. Thanks.

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Kerry

09-21-2000 18:59:58




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 Re: Re: Re: JD Model 40 Rebuild Information in reply to BIG, 09-21-2000 08:59:00  
I'll send you directions direct so we don't bore all the guys on the forum. Gilmer is a "pretty fur piece" from Commerce but a good field trip from Dallas. Broke F is in the Commerce phone book and open on Saturday until noon. They are really nice and aren't stingy with info even if you're not buying.

Directions coming off line.
Kerry



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clooney

09-20-2000 17:42:35




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 Re: JD Model 40 Rebuild Information in reply to BIG, 09-20-2000 16:03:17  
Big, I have done a few 40's & the piston rings are the first to go. The valve guides & seat recession are next. The bore wear on the ones I have done was pretty even with the expected extra wear in the top 2" or so. I don't know if your tractor has been re-ringed before or even bored O/S, so you won't know until go into it what will be required. You will probably find some "out of round " wear on the crank journals & bearing wear also. Check the head for cracks in the valve area (quite common on the 40)& while you are in there have a machine shop put in hardened valve seats (best money you will spend). You will probably have to go to J.D. for the engine parts & the cost isn't too bad from them, but keep in mind a lot of parts from J.D. aren't original anymore, they buy from vendors & outside suppliers & the quality isn't as good on some of the parts as it should be. Be careful splitting the tractor (I always make wood blocks & drive them in between the front axle & frame) the front likes to tip when you least expect it, & watch you don't bend the drive shaft when pulling it apart. You will probably find a lot of wear on the internal clutch linkage & especially the pivots. I have a manual for the 40, I don't want to sell it but can supply you with some copies of the important pages if you have plenty of time to wait for them after you request the info for the area you are working on. You should at least buy a parts manual as they are cheap & you will need it to buy parts because of all the running changes J.D. made on the 40. An I&T manual for the M-40 will be a big help also ( not much money) but doesn't contain the assembly tips & measurement specs that the J.D. manual does ( I personally don't think there is enough information in the I&T manual to do a correct overhaul of the 40 without some additional specs & procedures) but it will cover the basics.

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ToddT

09-21-2000 03:44:33




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 Re: Re: JD Model 40 Rebuild Information in reply to clooney, 09-20-2000 17:42:35  
Clooney, great advice (as usual). I'm about a month away from this same project myself. My 40 runs well but smokes like the dickens.

For what it's worth, I'm supporting clooney's advice on the manuals 100%. The I&T manual is minimal, the JD manual is far better. If you are going to invest the money into a proper rebuild, I'd suggest first spending the $80 to get the proper manual. Deere manuals can be purchased directly from Deere by calling 1-800-522-7448.

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Stan

09-21-2000 05:03:29




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 Re: Re: Re: JD Model 40 Rebuild Information in reply to ToddT, 09-21-2000 03:44:33  
I agree with the comments about getting a JD manual. I bought an I & T manual for my '41 B, then bought a JD book. In my opinion, the I & T manuals are written for the experienced mechanic (I guess they call them "techincians" these days) - I'm sure not in that category.

The Tech Manual is SM2013(01MAY56). Carburetor manual is SM2024(01JAN59), Electrical is SM2029(01SEP72) and Power Steering is SM2050(01JAN62).

Parts Catalog is PC862(01JUN63).

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cr

09-21-2000 05:55:46




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 Re: Re: Re: Re: JD Model 40 Rebuild Information in reply to Stan, 09-21-2000 05:03:29  
Stan: Before you torn the engine down, you should run a compression check on the engine. If the compression is the normal range, you might check for other sources of oil usage.

cr



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