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John Deere Tractors Discussion Forum
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Re: 4020

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Author  [Modern View]

06-19-2013 15:02:18

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No trans problems if you can find the early engine or even the 4230 engine except for those modifications mentioned above.
If it's a '67 gas why not get a diesel engine from an early 4020? They might be easier to find than an early 7700 that has the 4020 engine. It will already have the manifold on it. Also keep in mind that those old flatsides have been overheated. No matter what you get there are some linkage issues going form gas to diesel.

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06-20-2013 06:04:47

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 Re: 4020 in reply to D-, 06-19-2013 15:02:18  
Do you think I am better off trading the whole tractor? We have had it for probably 30 years, and I think we are the second owner. It hasn't been worked that hard since we have had it. It just sits too much now, and I know the diesel would handle that better than the gas does. I see you can buy completely rebuilt 4020 engines from some places too. Maybe that would be a good option

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06-20-2013 11:54:46

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 Re: 4020 in reply to isuvinny72, 06-20-2013 06:04:47  
As previously stated. For an "odd job" tractor, that"s a good combo as is. A few things to check if it"s a fuel hog. Make certain the mechanical advance works freely. Solid core wires and Pertronix points replacement with Autolite 3116 . Check the aircleaner for being dimpled in or plugged with dirt . An out of adjustment choke can leave the choke blade partly closed even with the knob all the way in. Set the mixture for as lean as it will run without missing. Instead of as smooth as possible.

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06-20-2013 17:01:18

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 Re: 4020 in reply to buickanddeere, 06-20-2013 11:54:46  
I would go solid state instead of points. No maintenance and I set my plugs at 45. The engine is worn and fouls a plug occasionally. This is an old loader tractor that I use around the shop and gets started more than it gets run.

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coonie minnie

06-20-2013 09:07:13

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 Re: 4020 in reply to isuvinny72, 06-20-2013 06:04:47  
Knowing what you have is worth a lot. You know what kind of maintanence was done etc. Those are unknowns when trading.

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