The 4 in line side valve engine, sometimes called the "Go Devil",
was the first to power the JEEP; all the models equiped with this engine were
very similar in their specifications. The military versions were the Ford
GPW and the Willys
MB and M38
and for civilian use were built the Willys
CJ 2A and CJ
3A. Specifications| G.V.W. | 3253 lbs. (2937 lbs. on CJ 2A) |
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| Curb weight | 2453 lbs. |
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| Overall length | 132 1/4 in. (122 3/4 in. on CJ 2A) |
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| Overall width | 62 in. (59 in. on CJ 2A) |
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| Overall height (top of windshield) | 52 in. (64 in. on CJ 2A, 66 7/8 in. on CJ 3A) |
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| Tread front and rear | 48 1/4 in. |
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| Wheelbase | 80" |
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| Front axle | Spicer 25, gear ratio 4.88:1. |
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| Rear axle | Spicer 23-2 or Spicer 41, gear ratio 4.88:1. |
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| Brakes | Service: Hydraulic, 9 in. drum diameter, 117 3/4 sq. in. braking area |
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| Clutch | Single, dry plate with torsional damping, 72 sq. in. area |
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| Cooling capacity | 11 qt. |
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| Electricity | Battery: 100 amp. hrs., 6-volt. (24 volt on M38) |
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| Engine | - 4 cyl. L-Head, side valves: 1 17/32 in. intake, 1 15/32 in. exhaust.
Bore and stroke 3 1/8 in. x 4 3/8 in. Displacement 134.2 cu. in. Max.
H.P. 60@4000 R.P.M. SAE H.P. 15.63. Torque 105 lbs. ft. @ 2000 R.P.M.
Compression ratio 6.48:1 |
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| Frame | - Heavy steel channel sides with 5 cross members and one K member. |
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| Fuel tank | 10 1/2 gallons |
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| Shock absorbers | - Telescopic hydraulic (lever type on rear axle of some Cjs) |
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| Springs | - Semi-elliptical leaf type. Front: 36 1/4 in. x 1 3/4 in., 8 leaves.
Rear: 42 in. x 1 3/4 in., 9 leaves. (10 or 11 leaves - heavy duty) |
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| Steering | - Cam and lever, overall ratio 14 to 1 |
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| Tires | - 6.00 x 16 (4 ply) |
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| Transfer case | - 2 speeds, 1.00:1 and 2.43:1 (1.97:1 and 2.47:1 low ratios also
exist) |
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| Transmission | - 3-speed syncromesh, Ratios: 1st-2.798:1, 2nd-1.551:1, 3rd- 1.00:1,
Reverse-3.798:1 |
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| Wheels | 4.50 x 16, 5 stud |
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PeculiaritiesFord GPW and Willys MB (Courtesy of Ets. M. Boucher, France. Fax: +33-1-46.86.35.04)
These are basically the same but manufactured by Ford and Willys,
respectively; their distinguishing features are the small headlamps inside the
grille, the windshield with two glasses, the spare wheel and jerrycan on the
back panel, ax and spade on the left side and fuel tank intake under the
driver's seat. All parts of the two vehicles can be interchanged, although a
Ford can be told apart from a Willys from small differences; the easiest to spot
is the cross member that supports the radiator, which is an inverted U on the
Ford and has round cross section on the Willys. The engine of the Ford was
originally painted grey while the Willys' was green. The first 25 808 Mbs had a
grille made from welded flat iron bar.
The GPW/MB was produced between 1941 and 1945; Ford manufactured 277 896 GPWs
while Willys made 361 349 Mbs. The serial numbers per year are listed below (Willys
numbers from "Ren? Boucher pr?sente la JEEP", Ford numbers
from Jim Gilmore). | Year | WILLYS numbers | FORD numbers |
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| 1st number | last number | 1st number | last number |
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| 1941 | MB 100 001 | MB 108 598 | - | - |
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| 1942 | MB 108 599 | MB 200 022 | 1 | 92 974 |
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| 1943 | MB 200 023 | MB 293 232 | ? | ? |
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| 1944 | MB 293 233 | MB 402 334 | ? | ? |
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| 1945 | MB 402 335 | MB 459 851 | ? | ? |
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M 38 "Robert Stanley's M38"
Not very different from the above, the M 38 has larger headlamps, the windshield
has just one glass, is higher than the MB's and carries three rectangular
ventilation ports underneath the glass; the fuel tank intake was moved to the
left panel. The word WILLYS appears embossed on both sides of the bonnet.
The M 38 was produced between 1950 and 1951. CJ 2A "Tim Lohse's CJ 2A"
This is a civilian model derived from the MB
it is mechanically identical but the front features two large headlamps with
chrome trim, the windshield has the same twin glasses of the MB but is higher
and carries the word WILLYS embossed on the base; this appears also on both
sides of the bonnet and on the rear panel. The fuel tank intake is on the left
side panel and the spare wheel was moved to the rear end of the right side
panel. The rear panel is now a drop tailgate.
The production of the CJ 2A began, probably, in July 1945; on the first year
only 1824 units were produced but when production ended, in 1949, the total
number was 136682. Prior to the CJ 2A over 30 prototypes were made with the
designation CJ2; of these, only 3 are known to exist. CJ 3A
The same as the M 38
with trimmed headlamps and alterations at the rear end similar to those of the CJ
2A. It was made from 1948 to 1953.
There was a 2WD version called DJ 3A. |
Posted Jul 21 2007 10:17PM
