The engine used in the 1/4-ton 4 x 4 Truck is the 4-cylinder, L-head, gasoline-type (figs. 1, 2, and 3), equipped with a counter-balanced crankshaft. The camshaft is operated off the crankshaft through a timing chain (fig. 40). The oil pump and distributor operate off the camshaft.
Fig. 1 – Front View
Type …………………………………………. L-head
Numbers of cylinders …………………………… 4<
Bore and stroke ……………………………….. 3.125 x 4.375 in.
Piston displacement ……………………………. 134.2 cu in.
Compression ratio ……………………………… 6.48 to 1
Max. brake horsepower ………………………….. 54 at 4,000
Compression (lb per sq in. at 185 rpm) …………… 111
SAE horsepower ………………………………… 15.63
Maximum torque ………………………………… 105 ft-lb at 2,000 rpm
Firing order …………………………………… l-3-4-2
Fig. 2 – Left View (Driver Side)
Fig. 3 – Right View (Passenger Side)
From TM 9-1803A Engine and Engine Accessories, Willys Overland Model MB and Ford Model GPW 1/4 Ton 4×4 Technical Manual