john deere gp

John Deere GP tractor photo
1928 - 1935 Two-Cylinder Letter SeriesRow-Crop tractor
1928 - 1935
Two-Cylinder Letter Series
Row-Crop tractor
1928 - 1935
Two-Cylinder Letter Series
Row-Crop tractor
1928 - 1935
Two-Cylinder Letter Series
Row-Crop tractor
Engine options
John Deere 5.1L 2-cyl kerosene
John Deere 5.6L 2-cyl kerosene
Engine Detail
John Deere
kerosene
2-cylinder
liquid-cooled inline
Original engine, used until 1931. Water-injection system was used to prevent detonation ("knocking") with low quality fuels.
Displacement
311.6 ci 5.1 L
Bore/Stroke
5.75x6.00 inches 146 x 152 mm
Rated RPM
900
Coolant capacity
36 qts 34.1 L
Engine Detail
John Deere
kerosene
2-cylinder
liquid-cooled
The new engine was introuded in 1931 on GP serial number 224100. It had lower compression but with a quarter-inch larger bore, producing slightly more power with better fuel economy. The lower compression eliminated the pre-ignition problem when using low-quality fuel, so the water-injection system was eliminated.
Displacement
339.3 ci 5.6 L
Bore/Stroke
6.00x6.00 inches 152 x 152 mm
Rated RPM
950
Coolant capacity
36 qts 34.1 L

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