GENERAL SPECIFICATIONS
|
| Model Designation: Roadmaster
8 - Series 70; |
| Wheel base: Roadmaster
8: 126-1/4; 130-1/4 on model 72 |
| Valve Location: In
head |
| Bore and
Stroke: 3-7/16
x 4-5/16 |
| Piston displacement, Cubic
Inches: 320.2 |
| Compression
ratio:
7.5 |
| Maximum
Brake Horsepower:
170 @ 3800 RPM |
| Maximum
Torque Lbs.Ft. @ RPM:
280 @ 2400 RPM |
| Normal
Oil Pressure Pounds: 35 |
TUNE UP SPECIFICATIONS
|
| Spark Plug
Make: AC 46X |
| Spark Plug
Gap, Inch: .025 |
| Firing
Order: 16258374 |
| Ignition
Timing: ADV. Timing
mark on Flywheel |
| Engine
Idle Speed, RPM:
450 |
| Cylinder
Head Torque Lbs.Ft.: 65-70 |
| Compression
Pressure & Cranking Speed: 114
Min. |
| Voltage & Polarity: 6
volts, negative ground |
PISTON AND RING SPECIFICATIONS
|
Fitting
Pistons with Scale:
Piston should fall on a .0015
feeler and stay on a .002 feeler |
Ring End
Gap: (Fit rings in tapered
bores for clearance shown in tightest portion of
ring travel.)
Compression: .010
Oil: .010 (no fitting necessary with Flex-Fit oil
rings) |
| Clearance
in Groove: Compression:
.0015-.0035; Oil: .0015-.003 (Flex-Fit oil rings:
.0015-.0035 |
| Wristpin
Diameter, Inch: .8744-.8749 |
VALVE SPECIFICATIONS
|
Operating
Clearance:
Intake:
0 Exhaust: 0 |
| Valve Seat
Angle, degrees: 45 |
Valve Timing: (BTDC
= before top dead center; ATDC = after top dead
center)
Intake
opens: 14 degrees BTDC
Exhaust
Closes: 25 ATDC |
Valve Spring
Pressure Pounds at Inches Length:
Inner
Spring: 52 @ 1-5/16; Outer Spring: 119 @ 1-19/32 |
| Valve Stem
Clearance: Intake: .0025; Exhaust:
.003 |
ENGINE BEARING SPECIFICATIONS
|
Connecting Rod Bearings:
Journal
Diameter, Inches: 2.248-2.249
Bearing Clearance, Inch: .0005-.002
Rod End Play, Inch: .005-.010
Rod Bolt Tension: Lbs.Ft.: 60-65 |
Main Bearings:
Journal
Diameter, Inches:
No. 1:
2.5605-2.5615
No. 2: 2.6235-2.6245
No. 3: 2.6855-2.6865
No. 4: 2.7485-2.7495
No. 5: 2.8105-2.8115
Bearing clearance: .0005-.002
Shaft End Play: .004-.008 (Thrust
on Bearing No. 3)
Main Bolt Tension: Lbs.Ft.: 90-100 |
CAPACITY DATA
|
Cooling
System:
Without
heater: 18 quarts
With heater: 19-1/2 quarts |
| Fuel Tank: 19
gallons |
| Engine
Oil: 7 quarts |
| Transmission: w/auto
11 qts. |
| Rear Axle: 3-1/2
pints |
DELCO-REMY DISTRIBUTOR SPECIFICATIONS
|
| Distributor part number:
1110832 (distributor rotates counter-clockwise) |
| Cam Angle,
degrees: 21-30 |
| Breaker Point opening, Inch: .016 |
| Condenser
Capacity: .18-.23
Mfds. |
| Breaker Arm Spring Tension: 19-23
Oz. |
Centrifugal
Advance: (degrees
at RPM of distributor)
Advance starts 0
degrees @ 225
Full Advance: 12 degrees @ 1675 |
Vacuum
Advance Data:
Inches of vacuum
to start plunger movement: 5 - 7
Inches of vacuum for full plunger travel:
12 - 13
Maximum vacuum advance, Dist. degrees:
6-8 |
DELCO-REMY GENERATOR SPECIFICATIONS
|
| Generator
Number: 1102779,
(generator rotates clockwise, 6 volts, Negative
Ground) |
| Generator
output: 50 @ 2400
RPM |
| Brush Spring
Tension: 25 oz. |
| Field Current: 1.9
- 2.05 at 6 volts |
REGULATOR SPECIFICATIONS
|
| Regulator
Number: 1118729 |
Cutout
Relay:
Voltage
to close points: 6.4
Armature Air Gap: .020 |
| Voltage
Regulator Setting: 7.3
volts |
| Current
Regulator Setting:
47 |
| Current
and voltage armature air gap, Inch: .075 |
DELCO-REMY STARTING MOTOR SPECIFICATIONS
|
| Part number: 1107981
(starter rotates clockwise) |
| Bush Spring
Tension, Ounces: 24-28 |
| No Load
Test: 65 amps,
5.0 @ 5500 RPM |
| Torque
Test: 600
Amps, 3.0 volts, torque: 16 |
WHEEL ALIGNMENT SPECIFICATIONS
|
Caster,
Degrees
Limits: -1/4
to +1-1/2
Desired: +5/8 |
Camber,
Degrees
Limits: -5/8
to +7/8
Desired: +1/8 |
| Toe-In,
Inches: 1/16 to 1/8 |
Toe-Out
on Turns, Degrees: (If
toe-out is incorrect, when other adjustments are
correct, look for bent steering arms.)
Outer wheel: 20
Inner Wheel: 20-3/4
to 22-1/4 |
Kingpin
Angle, or Steering Axis Degrees: (If
king pin or spindle support angle are incorrect,
but camber is correct, look for bent suspension
arms or steering knuckle support)
4-1/4 @ +3/8 Camber |
