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| | The following information comes from the Department of the Army
Technical Manual TM9-8014 dated April 1955. TRUCK,
UTILITY: 1/4 TON, 4 x 4
M38A1
AND
TRUCK, AMBULANCE: FRONT LINE
1/4 TON, 4 X 4, M170 a. General Data
| Capacities |
Cooling System |
11 1/2 qt |
| |
Crankcase (refill) |
4 1/2 qt |
| |
Differential (each) |
2 1/2 qt |
| |
Fuel Tank (M38A1) |
17 gal |
| |
Fuel Tank (M170) |
20 gal |
| |
Transmission |
1 qt |
| |
Transfer |
3 pt |
| Crew |
Operating |
1 |
| Cylinders |
|
4 |
| Dimensions (M38A1) |
Height, overall maximum |
73 3/4 in |
| |
Height, lowest operable (over steering wheel) |
56 1/2 in |
| |
Length, overall, maximum |
138 5/8 in |
| |
Width, overall maximum |
60 7/8 in |
| Dimensions (M170) |
Height, overall maximum |
78 in |
| |
Height, lowest operable (over steering wheel) |
56 1/4 in |
| |
Length, overall, maximum |
155 in |
| |
Width, overall maximum |
60 7/8 in |
| Electrical System |
|
24 volt |
| Ground Clearance, minimum |
|
9 5/16 in |
| Loading height (empty) |
M38A1 |
28 in |
| Loading height (empty) |
M170 |
27 3/4 in |
| Number of Batteries |
|
2 |
| Payload (maximum) |
M38A1 |
|
| |
Cross Country |
800 lb |
| |
Highway |
1,200 lb |
| Passengers (including crew) |
M38A1 |
4 |
| Passengers (including crew) |
M170 |
|
| |
Litter patients |
4 |
| |
Ambulatory Patients |
7 |
| Tires |
Pressure |
28 psi |
| |
Size |
7.00 x 16 |
| Towing pintle height |
|
21 1/2 in |
| Tread |
Front |
49 1/8 in |
| |
Rear |
49 3/16 in |
| Weight w/o crew (M38A1) |
Cross Country |
3,465 lb |
| |
Empty |
2,665 lb |
| |
Highway |
3,865 lb |
| |
|
|
| Weight w/o crew (M170) |
Cross Country |
3,763 lb |
| |
Empty |
2,963 lb |
| |
Highway |
4,196 lb |
| Wheelbase (M38A1) |
|
81 in |
| Wheelbase (M170) |
|
101 in |
b. Performance
| Allowable Speed |
|
1st |
2nd |
3rd |
Reverse |
| |
Transfer - High |
21 mph |
40 mph |
60 mph |
16 mph |
| |
Transfer - Low |
9 mph |
16 mph |
24 mph |
6 mph |
| Angle (M38A1) |
Approach |
46 deg |
| |
Departure |
34 deg |
| Cruising range (loaded) |
|
280 mi |
| Cruising speed |
|
55 mph |
| Engine Horsepower |
(Brake Horsepower at 4,000 rpm) |
72 hp |
| Fording depth |
|
37 1/2 in |
| Tow load - maximum |
Cross Country |
1,500 lb |
| |
Highway |
2,000 lb |
| Turning circle (M38A1) |
Left |
38 ft |
| |
Right |
38 ft 8 in |
| Turning circle (M170) |
Left |
24 ft 2 in |
| |
Right |
24 ft 7 in |
Engine
| Type |
|
F head |
| Make |
|
Willys |
| Number of cylinders |
|
4 |
| Bore |
|
3 1/8 in |
| Stroke |
|
4 3/8 in |
| Compression Ratio |
|
7.4 to 1 |
| Compression Pressure |
|
135 psi at 185 rpm |
| Displacement |
|
134.2 cu-in |
| Spark Plug Type/Gap (Qty 4) |
|
Autolite 2245 @.030" |
| Max Brake Horsepower |
|
72 @ 4,000 rpm |
| Maximum Torque |
|
114 ftlbs at 2,000 rpm |
| Firing Order |
|
1-3-4-2 |
| Valve Clearance |
Intake |
0.018 in |
| |
Exhaust |
0.016 in |
| Weights |
Power Plant |
680.81 lb |
| |
Engine, Dry complete with flywheel and accessories |
499.65 lb |
| |
Engine, Dry complete with flywheel less accessories |
365.15 lb |
| Oil Capacities |
With oil filter |
5 qt |
| |
Without oil filter |
4 qt |
Front Axle
| Manufacturer |
|
Spicer Mfg |
| Model |
|
25 |
| Drive Gear Ratio |
|
5.38:1 |
| Drive Type |
|
Hotchkiss |
| Axle Type |
|
Full Floating |
| Differential Type |
|
2 Pinion |
| Differential Drive Gear Type |
|
Hypoid |
| Turning Angle |
|
25 deg |
| Lubricant Capacity |
|
1 1/4 pt |
Rear Axle
| Manufacturer |
|
Spicer Mfg |
| Model |
|
|
| Drive Gear Ratio |
|
5.38:1 |
| Drive Type |
|
(Hotchkiss) thru springs |
| Axle Type |
|
semi-floating |
Transmission
| Make |
|
Borg-Warner Corp |
| Type |
|
Synchromesh |
| Speeds |
|
1 fwd, 3 rev |
| Ratios |
Low (first) |
2.798 to 1 |
| |
Intermediate (second) |
1.551 to 1 |
| |
High (third) |
1.000 to 1 |
| |
Reverse |
3.798 to 1 |
| Lubricant capacity |
|
2 pt |
Transfer
| Make |
|
Spicer Mfg |
| Model |
|
18 |
| Ratios |
Low Range |
2.43 to 1 |
| |
High Range |
1.00 to 1 |
| Lubricant Capacity |
|
3 pt |
Wheels and Tires
| Wheels |
Ordinance Number |
7387807 |
| |
Type |
std drop-center |
| |
Rim Size |
4.50 x 16.00 in |
| |
Stud circle diameter |
5.496 x 5.504 in |
| Tires |
Type |
Military NDT |
| |
Size |
7.00 x 16.00 in |
| Operating Pressures |
Highway |
28 psi |
| |
Cross Country |
22 psi |
| |
Mud, sand or snow |
15 psi |
|
