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Tractor Talk Discussion Forum

Engine rebuilding 4020 john deere

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Steve Heier

09-27-2004 17:13:48




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I'm planning on over hauling my diesel engine in a 67 or 68 year tractor 4020,.I would like to do it wright, what is the best way to do it? where is the best place to get the parts and where are the numbers on the block to get the wright rebuild kit?
I do have a friend that is at good diesel but never worked on a john deere engine.thank you.steve




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buickanddeere

09-29-2004 05:24:44




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 Re: Engine rebuilding 4020 john deere in reply to Steve Heier, 09-27-2004 17:13:48  
Purchase a factory rebuild from Deere and have the peace of mind warrenty gives.



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jjc

09-28-2004 06:46:44




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 Re: Engine rebuilding 4020 john deere in reply to Steve Heier, 09-27-2004 17:13:48  
just did a 4020 get the block number from the side of the engine before you get any parts there are 5 or 6 different blocks the serial number doesnot help



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HTR

09-28-2004 09:38:13




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 Re: Engine rebuilding 4020 john deere in reply to jjc, 09-28-2004 06:46:44  
You are right. the block casting number is behind the starter, sometimes hard to read with the starter installed.



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Leland

09-28-2004 06:03:37




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 Re: Engine rebuilding 4020 john deere in reply to Steve Heier, 09-27-2004 17:13:48  
Steve I would also look at m&w gear co, they make some great overhaul kits. After all they were the 1st after market supplier of engine kits for farm engines. they have some nice oversized piston kits which will give you a little more bang for your buck.



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New-Gen

09-27-2004 21:31:06




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 Re: Engine rebuilding 4020 john deere in reply to Steve Heier, 09-27-2004 17:13:48  
The best place in the long run to get the parts is your local John Deere dealer. They aren't that much more expensive than most aftermarket parts and they tend to be better quality.
If your friend is familiar with diesel engines the two of you shouldn't have much trouble overhauling your tractor. 4020 engines are pretty basic. One crucial thing is to make sure you get the O-ring grooves in the block where the liner drops down SPOTLESS, otherwise you might leak coolant into the crankcase.
Get yourself a service manual, the original John Deere one is the best, but I&T has one too, either one will give you all the specs on clearances, capacities, bolt tourques, ets.
The tractor serial# is at the back ot the rear end housing, that's all you need for ordering parts.
Good luck!
NG

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rustyfarmall

09-28-2004 06:37:52




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 Re: Engine rebuilding 4020 john deere in reply to New-Gen, 09-27-2004 21:31:06  
Even though I have Farmall as part of my handle I have been into more of the 3020 and 4020 engines than any others, and what you are saying about the O-ring grooves is correct, it cannot be stressed enough. Getting these grooves perfectly clean is critical. Also I have heard that these engines are getting old enough now that the grooves are becoming eroded away and it is tough to get the o-rings to seal. I think there is a cure for it but I don't know what it is.

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RJ-AZ

09-28-2004 17:40:08




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 Re: Engine rebuilding 4020 john deere in reply to rustyfarmall, 09-28-2004 06:37:52  
There are three O' ring grooves and many a stock 4020 had the center one open to weep holes on the outside of the block. JD jugs come with three new O' rings 1 orange and 2 black. Orange one is silicone rubber and goes in the bottom groove and the two black ones go in the top two grooves. I brazed a 1/4" rod onto a round wire brush and chuck it in a drill for cleaning the grooves.



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New-Gen

09-27-2004 21:29:48




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 Re: Engine rebuilding 4020 john deere in reply to Steve Heier, 09-27-2004 17:13:48  
The best place in the long run to get the parts is your local John Deere dealer. They aren't that much more expensive than most aftermarket parts and they tend to be better quality.
If your friend is familiar with diesel engines the two of you shouldn't have much trouble overhauling your tractor. 4020 engines are pretty basic. One crucial thing is to make sure you get the O-ring grooves in the block where the liner drops down SPOTLESS, otherwise you might leak coolant into the crankcase.
Get yourself a service manual, the original John Deere one is the best, but I&T has one too, either one will give you all the specs on clearances, capacities, bolt tourques, ets.
The tractor serial# is at the back ot the rear end housing, that's all you need for ordering parts.
Good luck!
NG

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