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4020 Gas to Diesel Switch

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Brian

02-04-2002 08:53:29




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I was wanting to know what it takes to switch a gas 4020 to diesel .What all do you have to switch other than the motor.




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Greg H.

02-05-2002 06:02:55




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 Re: 4020 Gas to Diesel Switch in reply to Brian, 02-04-2002 08:53:29  
Unless the Gasser is just a crap pile, I'd leave it gas. Some day the Gas tractors that are left original will be worth something, and they are easily rebuilt. I have a great 66 model Gas, and despite what WTW says it is a real 4020. Yes I have used both Gas and Diesel, and I know you loose alittle on low end lug, but for everyday farming, feeding and haymaking, there is no noticable difference. Except that is it's 15 degrees outside this morning, and if I were so inclined I could go start mine on the first roll over, instead of fooling around pluging it in, or running the battery down grinding the starter. However if it is a crap pile put your combine engine in it, and make my tractor more collectable. Better yet go find a late model diesel with side console hydrolics, saycro transmission, wide front end and Rops, and own what can only be discribed as a dream farm tractor. Go trade. Good Luck, Greg H.

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Scott

02-04-2002 18:04:42




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 Re: 4020 Gas to Diesel Switch in reply to Brian, 02-04-2002 08:53:29  
I just finished putting a late (inline pump and turbo) 7700 combine engine in my 4010. Here are some things you will need to do. Use the dampener/belt pulley off of a gas motor. It will fit the 404T crank. This allows you to use the original hydraulic pump coupling. You can get the water pump under your hood by simply leaning the radiator forward about a half inch at the top. You will have to trim some out around the hole in the hood for this. But the rubber on your radiator cap will cover it up. You will need to notch the block on the left rear side to match the rear end housing. This lets you use the original steel hydraulic line. I did this with a regular angle grinder. The flywheel will need the center hole trimmed out slightly. It was done easily with a die grinder. When you reinstall the sheet metal put the hood on top of the cowling instead of under it. This gives you more clearence for the turbo. I used some quarter inch fuel line to keep the hood from damaging the cowling. I used a razor knife to split the line then put it over the edge of the hood and it absorbs the vibration that way. If you have any questions email me at: [email protected] or call me at the number on the for sale page on the web site below. You can also see my 4010 there if you`re interested.

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Oaktree

02-04-2002 14:39:14




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 Re: 4020 Gas to Diesel Switch in reply to Brian, 02-04-2002 08:53:29  
Can You put in a Case 930 deisel?



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JD70Jim

02-04-2002 13:17:41




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 Re: 4020 Gas to Diesel Switch in reply to Brian, 02-04-2002 08:53:29  
LOTS I'm sure! Wouldn't it be a whole lot easier to sell the gasser to someone who wants one, take the $5000+ you'll get for it, add to that money the $5-6000 you were going to spend on a diesel 404 with extras, and just BUY a tractor that already IS a diesel? If you convert, anyone who later is in line to buy it only has to look at the serial number plate (I bet yours starts with 211) to know that they should reduce their offer!

Think about it.

If you really want to make it a diesel, do something outrageous---like put a cat 3208 or a cummins 5.9 in it! Better yet, adapt an IHC 414 (from a 856)! Then, other people will be intrigued with how you did it and ask incredulous questions of you.

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JD 4000

02-04-2002 11:57:10




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 Re: 4020 Gas to Diesel Switch in reply to Brian, 02-04-2002 08:53:29  
alot better and less headach. go find other tractor that is diesel. I have see alot around for sale. 4010 and 4020



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WTW

02-04-2002 10:29:50




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 Re: 4020 Gas to Diesel Switch in reply to Brian, 02-04-2002 08:53:29  
Brian, Converting a 4020 gas tractors to diesel is and can be a big subject. First if you want to take the easy route be sure you have the correct engine for the older tractor application. There are many versions of 404 John Deere engines and yes with enough effort and machine work you can use any of them. The easiest route with the least amount of work is find the 404 engine that has the injection pump driven from the original 4020 location (right rear corner of block) and also has the water pump bolted to the cylinder head (not the block). If you chose to use the newer series engine as used in later combines and 30 series tractors your task becomes allot greater. I just finished putting in a 4230 series engine from a 7700 combine in a 67 model gas power shift 4020. It was interesting as I did not move the radiator and used the original hydraulic pump coupling. Allot of tricks to be known to maintain the original radiator and pump coupling parts and locations (machine work required). If you can get the late 4020 404 engine as used in very early model 7700 combine is the best choice. To convert this engine from combine application to 4020 tractor application you will need 4020 diesel tractor exhaust manifold, intake manifold, possibly front pulley, flywheel (can alter gas on lathe and use diesel ring gear from combine flywheel), oil pump and oil pan (can use the gas oil pan but capacity may be less depending on how old your gas 4020 is), throttle linkage, air cleaner and piping and last but least a diesel starter (add starter relay if maintaining 12 volt electrical system). If you want more information let me know as I have done many of these in the last twenty some years. I can tell you everything right down to wiring connections if I knew what generator / alternator that you were going to use. The biggest pain is finding a dry type air cleaner, if you chose to go to the diesel oil bath type, they are readily available but the dry type is hard to find. I do know where there is a late model 4020 engine at in a 7700 combine. It is worth spending a little more for the older 4020 engine as you can find the newer engine easier and cheaper. If you go to the later 30 series engine alterations and machine work will burn up your difference fast. Hope this will help good luck. You will enjoy the experience of a real 4020 when you get a diesel under the hood. Dave W.

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