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A restored Willys M38
|Type||1⁄4 short ton (230 kg)[a] 4x4 Utility truck|
|Place of origin||United States|
|Number built||more than 60,000 produced|
|Weight||2,625 lb (1,191 kg) Empty|
|Length||133 in (3.38 m)|
|Width||62 in (1.57 m)|
|Height||62 in (1.57 m)|
51 hp (38 kW)
|Transmission||3 spd. x 2 range trf. case|
|Suspension||Beam axles on leaf springs|
|Fuel capacity||11 US gal (42 l)|
|220 mi (354.1 km)|
|Speed||60 mph (97 km/h)|
The Willys M38 United States Army Jeep, also known as the Willys MC, replaced the World War II Willys MB and Ford GPW models. It was a 1/4 ton 4 × 4 utility truck manufactured between 1949 and 1952 with a total production of more than 60,000 units. The M38 was military version of the then-current civilian Jeep CJ-3A. The M38 differed from the CJ-3A in numerous ways, including a reinforced frame and suspension, waterproof 24-volt electrical system, sealed vent system for the engine, transmission, transfer case, fuel system and brake system. Some M38 jeeps were assigned to the Korean theater of operations, but the majority of vehicles used in that conflict were rebuilt WWII vintage. Approximately 2,300 M38 Jeeps were manufactured by Ford of Canada for Canadian Armed Forces in 1952, designated as the M38-CDN jeep.
The M38 windshield could be folded flat for firing and the body was equipped with a pintle hook for towing and lifting shackles front and rear. The headlights were no longer recessed as on previous models, but protruded with a guard wire in front. The "pioneer" tools (axe and shovel) which were carried on the MB's driver side were transferred to the passenger side of this vehicle.
The M38 had an empty weight of 2,615 pounds (1,186 kg) and a gross vehicle weight of 3,825 pounds (1,735 kg) on road. The wheelbase was 80 in (2,032 mm), ground clearance was 9 1⁄4 in (235 mm) at the rear axle, maximum overall height was 67 1⁄4 in (1,708 mm), minimum width was 62 in (1,575 mm) and overall length was 132 15⁄16 in (3,377 mm).
- Bore/Stroke: 3 1⁄8 in × 4 3⁄8 in (79 mm × 111 mm)
- Compression Ratio: 6.48:1
- Displacement: 134.2 cubic inches (2,199 cc)
- Power: 60 hp (45 kW) at 4000 rpm
- Torque: 105 lb·ft (142 N·m) at 2000 rpm
- Main Bearings: 3
- Carburetor: Carter YS 637S, 1 1⁄4 in (32 mm) downdraft
The whole air intake and axle system was fully vented to allow for proper operation under water. Its full floating front axle (Dana 25) was supported by the wheel hub, rather than the axle itself, and provided greater carrying capacity. The rear axle (Dana 44) was semi-floating. Its powerplant was the L-head 134* with a T-90 transmission and Dana 18 transfer case.
A few M38 jeeps were fitted with a PTO (power take off - powered by transmission) driven winch, which was not used in the regular production models due to increased front end weight and maintenance issues.
The electrical system was upgraded to a 24 volt system which required dual 12 volt batteries connected in series. Its ignition and electrical systems were waterproof; a handy feature in rainy environments and where deep river fording was necessary.
- List of U.S. military vehicles by supply catalog designation
- List of U.S. military vehicles by model number
- Jeep trailer (M100)
- Off-road load rating
- Brown, Arch (1994). Jeep: The Unstoppable Legend. Lincolnwood, IL US: Publications International. p. 64. ISBN 0-7853-0870-9.
- "TM-9-804 1⁄4 4x4 Utility truck M38". US Dept. of the Army. Sep 1950. Retrieved 3 Dec 2014.
- "TM-9-1804A Engine (Willys-Overland Model MC)". US Dept. of the Army. Jun 1951. Retrieved 3 Dec 2014.
- "TM-9-1804B Power train body and frame". US Dept. of the Army. 16 Jul 1952. Retrieved 3 Dec 2014.
- "TM-9-8012 Operation and Maintenance". US Dept. of the Army. 12 Jan 1956. Retrieved 3 Dec 2014.
- "TM-9-2800-1953 Military Vehicles". US Depts. Of the Army and Air Force. Feb 1953. p. 154. Retrieved 27 May 2014.
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