Specifications drawn verbatim from 1942 General Motors MB-C1 Maintenance Manual...
PLEASE NOTE: All capacities are in Imperial Measurements!
GENERAL SPECIFICATIONS AND DATA
CANADIAN MILITARY PATTERN VEHICLES (CHEVROLET)
MODEL
C-8A C-15 C-15A C-30 C-60S C-60L C-GT
SERIES (G.M.)
8448
8445
8421 8444 8441 8442 8443 8440
Wheelbase
101' 101" 101" 134" 134" 158" 101"
Driving Wheels
4 2 4 4 4 4 4
BRAKES  
Type
Hydraulic
Booster Actuated
No No No No yes Yes Yes
Pedal Clearance (Toe Board)
1/4" to 1/2"
Hand Brake Location
Rear Wheels Rear Wheels Rear Wheels Propellor Shaft Propellor Shaft Propellor Shaft Propellor Shaft
Master Cylinder Mounting
Right Hand Frame Side Rail
Master Cylinder Size
1 1/4"
Fluid Level
Check Every 500 Miles
Brake Fluid
Use only Fluid Obtained from Army Stores
Front Wheel Cylinder Size
1 3/8" 1 1/4" 1 3/8" 1 3/8" 1 3/8" 1 3/8" 1 3/8"
Rear Wheel Cylinder Size
1 1/2" 1 3/8" 1 1/2" 1 1/2" 1 1/2" 1 1/2" 1 1/2"
FRONT AXLE  
Track - Front (inches)
62 1/8 67 70 70 70 1/2 70 1/2 70 1/2
Camber (degrees)
3/4 1 +/- 1/2 3/4 3/4 3/4 3/4 3/4
Caster (degrees)
1 1/2 to 2 2 3/4 +/- 1/2 1 1/2 to 2 1 1/2 to 2 1 1/2 to 2 1 1/2 to 2 1 1/2 to 2
Toe-in
0 1/16" to 1/8" 0 0 0 0 0
Turning Radius
26 1/2 19 1/2 23 1/4 30 1/2 30 1/2 35 23 1/4
STEERING  
Type
Recirculating Ball
Ratio
23.6 to 1
REAR AXLE  
Track - Rear (inches)
62 1/8 64 70 1/2 70 1/2 69 69 69
Ratio
6.16 to 1 6.16 to 1 6.5 to 1 7.16 to 1 7.16 to 1 7.16 to 1 7.16 to 1
Drive
Spiral Bevel Hypoid Spiral Bevel Spiral Bevel Spiral Bevel Spiral Bevel Spiral Bevel
Make
Clark G.M. G.M. G.M. G.M. G.M. G.M.
Gear to Pinion Backlash
.008" to .012" .005" to .008" .008" to .010" .008" to .010" .008" to .010" .008" to .010" .008" to .010"
Gear Run Out (Maximum)
.005" .005" .005" .005" .005" .005" .005"
Case Run Out (Maximum)
.003" .002" .002" .002" .002" .002" .002"
Clearance Between -
 
Pinion and Spider
.003" to .007" .004" to .008" .003" to .007" .003" to .007" .003" to .007" .003" to .007" .003" to .007"
Side Gear and Case
.005" to .009" .002" to .006" .005" to .009" .005" to .009" .005" to .009" .005" to .009" .005" to .009"
SPRINGS AND SHOCK ABSORBERS  
Springs - No. of Leaves - Front
9 8 10 10 10 10 10
Rear
8 8 12 12 18 with Aux. 18 with Aux. 12
Width of Leaves - Front
1 3/4" 2" 2" 2" 2" 2" 2"
Rear
2.240" 2.470" 2.447" 2.447" 2.447" 2.447" 2.447"
Spring Seat length - Front
5" 5 1/4" 6 3/8" 6 3/8" 6 3/8" 6 3/8" 6 3/8"
Rear
5 5/16" 6 1/8" 6" 6" 6" 6" 6"
Center to Center of Eyes - Front
36 1/16" 40" 40" 40" 40" 40" 40"
Rear
45" 45" 50" 50" 50" 50" 50"
Center of Front Eye to Seat - Front
18 7/8" 20 3/8" 20" 20" 20" 20" 20"
Rear
22 1/2" 22 1/2" 25" 25" 25" 25" 25"
Shock Absorbers
Delco
Type
Piston
Action
Double Acting
ENGINE  
Type
Valve in Head
No. of Cylinders
6
Bore - Inches
3 1/2
Stroke - Inches
3 3/4
Piston Displacement - Cu. In.
216.5
Compression Ratio
6.5:1
Horse Power - S.A.E.
29.4
Max. Brake Horse Power
85 at 3400 r.p.m.
Max. Engine Torque
170 ft. lbs. At 1200 r.p.m.
Firing Order
1-5-3-6-2-4
Valve Seat Angle
30 degrees
ENGINE ADJUSTMENTS  
Intake Valve Clearance (Hot)
.012"
Exhaust Valve Clearance (Hot)
.020"
Distributor Point Opening
.018"
Spark Plug Type
A.C. 44 14mm.
Spark Plug Gap
.040"
Carburetor Idle Adjustment
1 to 2 turns open
CLUTCH  
Type
Single Dry Disk
Diameter
10 3/4"
Clutch Pedal Lash
1"
TRANSMISSION  
Forward Speed
4
Reverse Speed
1
Clearance Between -
 
Main Shaft and Sling Gear
.0035" to .0065"
Reverse Shaft and Bushing
.0025" to .0045"
Shift Fork and Gear
.009" to .019"
Countershaft End Thrust
.012" to .017"
TRANSFER CASE  
Single Speed with Front Axle Declutch
Yes   Yes  
Double Speed, Front Axle
Declutch, Power Take-off
  Yes Yes Yes Yes
Single Speed Gear Ratio
1 to 1   1 to 1  
Double Speed - Low Speed
  1.87 to 1 1.87 to 1 1.87 to 1 1.87 to 1
- High Speed
1 to 1 1 to 1 1 to 1 1 to 1
Gears
Helical   Helical Spur Spur Spur Spur
ELECTRICAL SYSTEM  
Generator - Type
Current and Voltage Regulated
Voltage Setting (Hot)
7.2 - 7.4 V.
Current Setting (Hot)
32 - 34 Amp.
Current and Voltage Regulator Model No.
1118201
Starting Motor
6 Volt Mechanical Shift
BATTERY  
Battery Model
6 VN-15-G
No. of Plates
15
Capacity
100 at 20 hour rate
Voltage
6
Terminal Grounded
Negative
Hydrometer Reading -
Fully Charged
1.275 to 1.399 at 80 deg F.
Half Charged
1.225
Dangerously Low
1.150
Electric Current Protection
Current Limit Relay
LAMP BULBS  
Mazda No.
 
Headlamp
3666
Instrument Lights
55
Tail Lamps
63
Side Lamps
63
Stop Lamps
63
Axle Lamp
63
Inspection Lamp
1129
Beam Indicator
51
LAMP BULBS  
Candle Power
 
Headlamp
36/6 W
Instrument Lights
1 1/2
Tail Lamps
3
Side Lamps
3
Stop Lamps
3
Axle Lamp
3
Inspection Lamp
21
Beam Indicator
1
CAPACITIES  
Crankcase (Fill)
5 1/4 Qts.
Crankcase (Refill)
5 Qts.
Transmission
4 3/4 Pts.
Transfer case (with Power 
Take-off add 1/2 Pt.)
3-1/3 Pts.   3-1/3 Pts 2 Pts. 2 Pts. 2 Pts. 2 Pts.
Winch
  6 Pts. 6 Pts. 6 Pts. 6 Pts.
Rear Axle
7 1/2 Pts. 9 1/4 Pts. 7 1/2 Pts. 7 1/2 Pts. 7 1/2 Pts. 7 1/2 Pts. 7 1/2 Pts.
Front Axle
7 1/2 Pts.   7 1/2 Pts. 7 1/2 Pts. 7 1/2 Pts. 7 1/2 Pts. 7 1/2 Pts.
Cooling System
13 Qts.
Steering Gear
1 1/4 Lbs.
Oil Bath Air Cleaner
1 Qt.
Rear Wheel Bearings
2 Lbs.
Front Axle "U" Joints
4 1/2 Lbs. - 4 1/2 Lbs. 4 1/2 Lbs. 4 1/2 Lbs. 4 1/2 Lbs. 4 1/2 Lbs.
Fuel Tanks (Each Tank)
12 1/2 Gals. 12 1/2 Gals. 12 1/2 Gals. 12 1/2 Gals. 12 1/2 Gals. 12 1/2 Gals. 20 Gals.
WEIGHTS AND MEASUREMENTS  
Maximum Gross Rating
7,250 11,200 8,500 11,200 15,700 15,700 12,600
Chassis and Cab (Curb Weight)
  4,805 5,485 5,920 6,503 6,658  
Chassis, Cab and Body (Curb Weight)
5,750   9,733
Overall Height (Less Body)
86 3/4 81 3/4 86 1/8 87 3/8 89 5/8 89 5/8 96
Overall Length
156 3/4" 166" 166" 199" 199" 223" 176"
Overall Width at Front Fenders
75 3/8" 82 13/16" 82 13/16" 82 13/16" 82 13/16" 82 13/16" 82 13/16"
Overall Width at Rear Tires
(Outside of Tires)
71 3/8" 76 3/8" 76 3/8" 81 1/16" 81 1/16" 79 3/8" 79 3/8"
Clearance Under Front Axle
9-15/16" 11-3/32" 8 3/4" 9 1/8" 11 1/8" 11 1/8" 11 5/8"
Clearance Under Rear Axle
9-15/16" 9-5/16" 8 3/4" 9 1/8" 11 1/8" 11 1/8" 11 5/8"
Lowest Point Under Centre of Chassis
14" 16 1/2' 18" 17 1/2" 20" 20 1/2" 20 3/4"
TIRE PRESSURE CHART  
Model Designation
C-8A C-15 C-15A C-30 C-60S C-60L C-GT
Tire Size
9.25x16 9.00x16 9.00x16 10.50x16 10.50x20 10.50x20 10.50x20
Weight Distribution (upon which specified tire pressures are based - per axle)
Front
3600 3070 3470 4649 5418 6068 4536
Rear
3650 4500 5010 6892 9928 9642 7448
R.F. TIRES  
Cross Country (18% Deflection)  
Front
19 10 10 12 14 20 10
Rear
19 16 24 30 50 48 34
Hard Roads (Canada) (13 1/2% Deflection)  
Front
35 20 30 24 27 32 20
Rear
35 28 39 44 69 63 49
PNEUMATIC TIRES  
Cross Country (18% Deflection)  
Front
15 16 23 24 28 18
Rear
27 32 37 52 50 37
Hard Roads (Canada) (13 1/2% Deflection)  
Front
  35 35 35 35 35 35
Rear
49 57 51 76 73 48

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