I suppose the 'heart' of the jeep is its engine.

I suppose the ‘heart’ of the jeep is its engine.

Below are pictures of the jeep engine in the RAW!  Pretty sexy, huh?  Okay, all kidding aside the WW2 jeep engine was pretty amazing when you consider what all it was put thru during the war years.  Also, consider that it was basically a reworked engine from the 1930s Willys-Overland automobiles.

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. The oil pump and distributor operate off the camshaft.

 

frtvw

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 ……………………………………………… 1-3-4-2

 

lfvw

Fig. 2 – Left View (Driver Side)

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Fig. 3 – Right View (Passenger Side)

 

From TM 9-1803A, February 24, 1944.

The Complete WW2 Military Jeep Manual contains TM 9-1803A and other publications that should be of interest to WW2 jeep enthusiasts.

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