John Deere 4020

John Deere 6.6L 6-cyl diesel

Bore × stroke

4.25 in × 4.75 in

Rated speed

2,200 rpm

Compression

16.5:1

Cooling

liquid-cooled inline

Firing order

1-5-3-6-2-4

Notes

6-cylinder 12-valve. Oil capacity on most 4020 diesels increased from 8 to 12 quarts starting with the 1969 model year, tractor serial number 201,000. High-crop diesel tractors retained the 8-quart capacity throughout the production run. Tractors fitted with after-market turbochargers, and early tractors with replacement oil pans, may also have the higher oil capacity.

John Deere 5.6L 6-cyl gasoline

Bore × stroke

4.25 in × 4 in

Rated speed

2,200 rpm

Compression

7.5:1

Cooling

liquid-cooled inline

Firing order

1-5-3-6-2-4

Notes

6-cylinder 12-valve. Original gasoline and LP-gas engine, used through the 1965 model year.

John Deere 5.9L 6-cyl gasoline

Bore × stroke

4.25 in × 4.25 in

Rated speed

2,200 rpm

Compression

7.5:1

Cooling

liquid-cooled inline

Firing order

1-5-3-6-2-4

Notes

6-cylinder 12-valve. The larger, 362 ci engine became available in 1966, replacing 340 ci engine.

John Deere 5.9L 6-cyl LP gas

Bore × stroke

4.25 in × 4.25 in

Rated speed

2,200 rpm

Compression

9.0:1

Cooling

liquid-cooled inline

Firing order

1-5-3-6-2-4

Notes

6-cylinder 12-valve

John Deere Syncro-Range: Synchro-Range requires the tractor to be stopped and clutch depressed to select one of four shift stations. Once a station is selected the tractor can be shifted on the move between the two forward gears (and single reverse in stations 1 and 2) by using the clutch.

John Deere Power Shift: Power Shift allows shift-on-the-move between gears without clutching.