John Deere AR Unstyled Engine
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| Engine options | |
| John Deere 5.1L 2-cyl all fuel | |
| John Deere 5.3L 2-cyl all fuel |
| Engine Detail | |
| John Deere | |
| all fuel | |
| 2-cylinder | |
| liquid-cooled horizontal twin | |
| Original engine, used until 1940 at serial number 259334. | |
| Displacement | 309 ci 5.1 L |
| Bore/Stroke | 5.50x6.50 inches 140 x 165 mm |
| Cooling system | thermo-siphon |
| Air cleaner | oil bath |
| Compression | 3.96:1 |
| Rated RPM | 975 |
| Firing order | 1-2 |
| Oil capacity | 9.25 qts 8.8 L |
| Coolant capacity | 32 qts 30.3 L |
| Sparkplug gap | 0.030 inches 0.762 mm |
| Engine Detail | |
| John Deere | |
| all fuel | |
| 2-cylinder | |
| liquid-cooled | |
| Larger engine, introduced in 1940 (serial number 260000) | |
| Displacement | 321 ci 5.3 L |
| Bore/Stroke | 5.50x6.75 inches 140 x 171 mm |
| Air cleaner | oil bath |
| Compression | 4.45:1 |
| Rated RPM | 975 |
| Firing order | 1-2 |
| Oil capacity | 11 qts 10.4 L |
| Page information | |
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| Peter Easterlund - owner/author | |
| Email: Peter@TractorData.com | |
| Updated on March 16, 2025 |