Hercules DFXE

The Hercules DFXE was an American diesel truck engine produced by the Hercules Engine Company.

Part of the Hercules DFX series, the DFXE is a naturally aspirated, direct injection,overhead valve, inline six-cylinder engine. The engine had a displacement of 855 cuin, with a bore of 5+5/8 in, a stroke of 6 in and a compression ratio of 14.8:1. It developed 201 bhp at 1,600 rpm and a maximum 685 ft.lbf of torque at 1150 rpm; 660 ft.lbf at 1600 rpm.

The DFXE was designed to requirements of the British Purchasing Commission for use in the Diamond T Model 980 tank transporter. As the Diamond T Model 980 was later adopted by the US, the DFXE was one of the few diesel engines used by US tactical trucks during World War II.

The engine was used in upright or horizontal configurations.

It was used in the Diamond T Models 980 and 981 trucks in World War Two, the Le Tourneau Model B29 Tournapull earthmover (introduced in 1945), and the Oliver OC-18 crawler tractor (introduced in 1952), among others.