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John Deere Tractors Discussion Forum
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4020 gas

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Jim A.

08-04-2004 20:27:25




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Just saw a 4020 gas the other day, first one I've ever seen. How many cubic inches is that engine? That engine block sure looks like the diesel. Is it a similar block, and if so, does that mean it has seven main bearings? That would make one tough gasser.




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Greg H.

08-05-2004 10:23:52




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 Re: 4020 gas in reply to Jim A., 08-04-2004 20:27:25  
Jim A,
Just like posted below the 4020 gas was a 341 cubic inch engine, until the late models came out and they were around 360. I have a 1966,and there are five 4020 gas tractors located within five miles of my home. I'd guess that's the probobly they highest concentration of 4020 gas tractors still in operation anywhere. There was a sixth, but the farmer converted his to diesel with a combine motor some years back. There are no main problems with the gassers. They will use some fuel if you are doing tillage work, but a 404 diesel will also use some fuel when under a load. Gassers in my part of the country once cost about four to five thousand dollars less than a diesel. Now the prices are getting closer on early models, but late side console models diesels still bring premiums. If you ever get a gasser, put electronic ignition on it, make sure your float is set right in the carb, and you will have a fine old tractor. The diesels are alittle tougher, and lug better, but if you wind the RPM's the gas still makes good power. I use mine mostly for pulling in ensalage wagons, and baling hay.
Take it easy, Greg H.

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MARY JO JACKSON

03-01-2005 07:56:49




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 Re: 4020 gas in reply to Greg H., 08-05-2004 10:23:52  
MY HUSBAND IS LOOKING FOR A REPLACEMENT MOTOR FOR OUR JOHN DEERE 4020. ANY ONE KNOW WHERE WE CAN BY A NEW OR USED ONE?



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Del

08-05-2004 08:13:51




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 Re: 4020 gas in reply to Jim A., 08-04-2004 20:27:25  
We have a 4020 gas with a 158 loader with pallet forks on it. We use it mainly to stack round bales, moved palleted materials and light field work.We replaced the front axle with an axle from a 4640 and now it will lift pallets with 2 ton on them with no trouble. My son hooked it to a 22ft field cultivator one day and went through a tank of gas in what seemed like minutes. It had to burn better than 10 gallon an hour. Since then all the heavy work is done with the 4320 diesel. We,ve had the gasser about ten years, put about 1200hrs on it and have had no major problems. Points and plugs, and minor electrical problems is all.

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G-MAN

08-05-2004 10:33:37




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 Re: 4020 gas in reply to Del, 08-05-2004 08:13:51  
A Pertronix electronic ignition setup will cure it of ever having point issues again, and will also make it start easier, be more responsive and probably a little more fuel efficient. They work like a charm on spark-ignition New Gens.



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Dr.EVIL

08-05-2004 09:38:15




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 Re: 4020 gas in reply to Del, 08-05-2004 08:13:51  
Guy I worked for in High School had a 4020D & 4320 and got a 4020-G when He bought another 240 acres one year. It was a used tractor, WFE, probably about a '64 or '65. I plowed with it one night, 5-14's in 4th gear in an 80 acre field. Made a round every 15 minutes and a tank of gas lasted 4 hours! every 16 rounds I had to head back to the gas barrel.



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I Bleed Green

08-05-2004 03:33:29




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 Re: 4020 gas in reply to Jim A., 08-04-2004 20:27:25  

I have a 1966 4020 Gas. A 4020 Gas made from 1964 to 1969 have a 341 cu in engine. 1969 to 1972 have a 360 cu in engine.



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fred

08-05-2004 06:56:06




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 Re: 4020 gas in reply to I Bleed Green, 08-05-2004 03:33:29  
Think the 4010 was 341,the early 4020 was 361 and the 69 model and up was a full 404 CID.Same bore and stroke as the diesel.



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Doug in IL.

08-05-2004 07:22:37




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 Re: 4020 gas in reply to fred, 08-05-2004 06:56:06  
The 4010 was 302 cu. in. The early 4020's were 341. The '69 and later tractors were 362 cu. in. There was never a 404 gas engine in a 4020.



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JDBert

08-05-2004 07:51:01




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 Re: 4020 gas in reply to Doug in IL., 08-05-2004 07:22:37  
Since we are on the gas cubic inch ? Was the 7700 gas combine a 404 cubic inch motor?



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Doug in IL.

08-05-2004 13:39:42




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 Re: 4020 gas in reply to JDBert, 08-05-2004 07:51:01  
The 7700 engine was a 362 cu. in. in the gas models.



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Bob

08-04-2004 22:28:02




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 Re: 4020 gas in reply to Jim A., 08-04-2004 20:27:25  
The gas block omits 3 main bearings, has 4 instead of 7.



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rjb

08-04-2004 21:51:54




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 Re: 4020 gas in reply to Jim A., 08-04-2004 20:27:25  
You know I have always wondered about this as well...which is a more reliable engine the desiel or the gas??



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Mike M

08-05-2004 04:53:34




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 Re: 4020 gas in reply to rjb, 08-04-2004 21:51:54  
Generally a diesel should last longer than a gas,but that is all relative to proper maintance.



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