1971 CHECKER

General Specifications:

Chasis:

Marathon:

Wheelbase: 120"

Overall Length: 204"

Tire Size: G78 X 15 Inches

Marathon DeLuxe

Wheelbase: 129"

Overall Length: 213"

Tire Size: G78 X 15 Inches

Body Data:

Checker Marathon Series:

6 Cylinder:

Model A12; 4 Door Sedan, 6 Passenger, Body #A12

Base Price: $3,843; Shipping Weight: 3,400 Pounds;

Model A12; 4 Door Station Wagon, 6 Passenger, Body #A12W

Base Price: $4,113; Shipping Weight: 3,600 Pounds;

8 Cylinder:

Model A12; 4 Door Sedan, 6 Passenger, Body #A12

Base Price: $3,956; Shipping Weight: 3,500 Pounds;

Model A12; 4 Door Station Wagon, 6 Passenger, Body #A12W

Base Price: $4,228; Shipping Weight: 3,700 Pounds;

Checker Marathon DeLuxe Series:

6 Cylinder:

Model A12; 4 Door Sedan, 8 Passenger, Body #A12E

Base Price: $4,536; Shipping Weight: 3,700 Pounds;

Model A12; 4 Door Limousine, 8 Passenger, Body #A12E

Base Price: $5,510; Shipping Weight: 3,700 Pounds;

8 Cylinder:

Model A12; 4 Door Sedan, 8 Passenger, Body #A12E

Base Price: $4,651; Shipping Weight: 3,800 Pounds;

Model A12; 4 Door Limousine, 8 Passenger, Body #A12E

Base Price: $5,626; Shipping Weight: 3,800 Pounds;

Engine Specifications:

6 Cylinder Engine, 250 Cu. In. 1 Barrel Carburetor, 145 HP:

Engine Type: Inline 6 Cylinder, Overhead Valve

Bore & Stroke: 3.875" X 3.53"

Engine Displacement: 250 Cu. In.

Compresssion Ratio: 8.5 to 1

Taxable Horsepower: 36.03

Horsepower: 145 @ 4,200 RPM

Torque: 230 Ft. Lbs. @ 1,600 RPM

Normal Oil Pressure: 30-45 Lbs/Sq. In

1Barrel Carburetor

8 Cylinder Engine-350 Cu. In., 215 HP:

Bore & Stroke: 4.001" X 3.48"

Engine Displacement: 350 Cu. In.

Compression Ratio: 8.10:1

Taxable Horsepower: 51.22

Horsepower: 215 @ 4,000 RPM

Torque: 335 Ft. Lbs @ 2,800 RPM

Normal Oil Pressure: 30 Lbs/Sq. In.

8 Cylinder Engine-350 Cu. In., 245 HP:

Bore & Stroke: 4.001" X 3.48"

Engine Displacement: 350 Cu. In.

Compression Ratio: 8.50:1

Taxable Horsepower: 51.22

Horsepower: 245 @ 4,800 RPM

Torque: 350 Ft. Lbs @ 2,800 RPM

Normal Oil Pressure: 35-45 Lbs/Sq. In.

Tune-Up Specifications:

6 Cylinder Engine:

Spark Plug Type: AC R46TS

Sprk Plug Gap: .035"

Point Gap:

New Points: .019"

Used Points: .016"

Dwell Angle: 31 to 34 Degrees

Ignition Timing: 4 Degrees BTDC

Engine Idle Speed:

Manual Transmission: 700 RPM

Automatic Transmission: 600 RPM in Drive

8 Cylinder Engine:

Spark Plug Type: AC R44TS (Aerobus: R44T)

Sprk Plug Gap: .035"

Point Gap:

New Points: .019"

Used Points: .016"

Dwell Angle: 29 to 31 Degrees

Ignition Timing: 6 Degrees BTDC

Engine Idle Speed:

Automatic Transmission: 550 RPM in Drive

Distributor Specifications:

Distributor #1112048

Advance Starts: 0 Degrees @ 600 RPM

Centrifugal Advance:

Intermediate Advance: 8 Degrees @ 850 RPM

Full Advance: 10 Degrees @ 1,900 RPM

Vacuum Advance:

Vacuum to Start Plunger: 8"

Maximum Advance: 8 Degrees @ 17" Vacuum

Distributor #1110489

Advance Starts: 0 Degrees @ 475 RPM

Centrifugal Advance:

Intermediate Advance: 1 Degree @ 635 RPM

7 Degrees @ 1,150 RPM

Full Advance: 12 Degrees @ 2,050 RPM

Vacuum Advance:

Vacuum to Start Plunger: 8"

Maximum Advance: 11-1/2 Degrees @ 16" Vacuum

Distributor #1112005

Advance Starts: 0 Degrees @ 400 RPM

Centrifugal Advance:

Intermediate Advance: 1 Degree @ 600 RPM

4 Degrees @ 700 RPM

Full Advance: 12 Degrees @ 2,150 RPM

Vacuum Advance:

Vacuum to Start Plunger: 8"

Maximum Advance: 10 Degrees @ 17" Vacuum

Valve Specifications:

6 Cylinder Engines:

Valve Lash: Hydralic Lifters-1 Turn Down From Zero Lash

Valve Angles:

Seat: 46 Degrees

Face: 45 Degrees

Valve Spring Height, Installed: 1.66"

Valve Spring Pressure: 186 Lbs. @ 1.27"

Valve Stem Clearance:

Intake: .001" to .0027"

Exhaust: .0015" to .0032"

Valve Stem Diameter:

Intake: .3410" to .3417"

Exhaust: .3410" to .3417"

8 Cylinder Engines:

Valve Lash: Hydralic Lifters-1 Turn Down From Zero Lash

Valve Angles:

Seat: 46 Degrees

Face: 45 Degrees

Valve Spring Height, Installed: 1.70"

Valve Spring Pressure: 200 Lbs. @ 1.25"

Valve Stem Clearance:

Intake: .001" to .0027"

Exhaust: .001" to .0027"

Valve Stem Diameter:

Intake: .3410" to .3417"

Exhaust: .3410" to .3417"

Pistons, Pins, Rings, Crankshaft, & Bearing Specifications:

6 Cylinder Engine:

Piston Clearance: .0015" to .0025"

Ring End Gap:

Compression: .010"

Oil: .015"

Wrist Pin Diameter: .9272"

Rod Bearings

Shaft Diameter: 1.999" to 2.000"

Bearing Clearance: .0007" to .0027"

Main Bearings:

Shaft Diameter: 2.2983" to 2.2993"

Bearing Clearance: .0003" to .0029"

Thrust on Bearing #7

Shaft End Play: .002" to .006"

8 Cylinder Engine, 350 Cu. In.:

Piston Clearance: .0007" to .0017"

Ring End Gap:

Compression:

Top Ring: .010"

Bottom Ring: .015"

Oil: .015"

Wrist Pin Diameter: .9272"

Rod Bearings

Shaft Diameter: 2.099" to 2.100"

Bearing Clearance: .0013" to .0035"

Main Bearings:

Shaft Diameter:

#1, 2, 3, & 4: 2.4484" to 2.4493"

#5: 2.4479" to 2.4488"

Bearing Clearance:

#1: .0008" to .0020"

#2, 3, 4: .0011" to .0023"

#5: .0017" to .0033"

Thrust on Bearing #5

Shaft End Play: .002" to .006"

Engine Tightening Specifications:

6 Cylinder Engine:

Spark Plugs: 15 Ft. Lbs

Cylinder Heat Bolts: 95 Ft. Lbs.

Intake Manifold:

End Bolts: 20 Ft. Lbs

Center Bolts: 30 Ft. Lbs.

Exhaust Manifold

End Bolts: 20 Ft. Lbs

Center Bolts: 30 Ft. Lbs'

Rocker Arm Cover: 45 Inch Lbs.

Connecting Rod Cap Bolts: 35 Ft. Lbs.

Main Bearing Cap Bolts: 65 Ft. Lbs.

Flywheel to Crankshaft: 60 Ft. Lbs.

Vibration Damper or Pulley: 60 Ft. Lbs.

8 Cylinder Engine, 350 Cu. In.:

Spark Plugs: 21 Ft. Lbs

Cylinder Heat Bolts: 65 Ft. Lbs.

Intake Manifold: 30 Ft. Lbs.

Exhaust Manifold:

Inside Bolts: 30 Ft. Lbs

Outside Bolts: 20 Ft. Lbs.

Rocker Arm Studs: 50 Ft. Lbs.

Rocker Arm Cover: 45 Inch Lbs.

Connecting Rod Cap Bolts: 45 Ft. Lbs.

Main Bearing Cap Bolts: 75 Ft. Lbs.

Flywheel to Crankshaft: 60 Ft. Lbs.

Vibration Damper or Pulley: 60 Ft. Lbs.

Alternator Specifications:

Make: Motorola

Model #: 8AL-2002

Amperes: 55

Volts: 15

Field Current: 1.8 to 2.4 Amperes, 12.6 Volts

Voltage Regulator #8RD2009

Regulator Test @ 120 Degrees F:

10 Amperes @ 2,000 RPM (Alternator) @ 13.4 to 13.9 Volts

Starting Motor Specifications:

6 Cylinder Engine:

Starter #1108365

Brush Spring Tension: 35 Ounces

Free Speed Test: 49-87 Amperes, 10.6 Volts @ 6,200-10,700 RPM

Resistance Test: 290-425 Amperes @ 4.2 Volts

8 Cylinder Engine:

Starter #1108361

Brush Spring Tension: 35 Ounces

Free Speed Test: 65-100 Amperes, 10.6 Volts @ 3,600-4,100 RPM

Resistance Test: 300-6-360 Amperes @ 3.5 Volts

Rear Axle Specifications:

Model #44

Carrier Type: Integral

Ring Gear & Pinion Backlash:

Method: Shims

Adjustment: .005" to .010"

Pinion Bearing Preload:

Method: Shims

New Bearings: 20 to 40 Inch Pounds

Used Bearings: 10 to 20 Inch Pounds

Differential Bearing Preload:

Method: Shims

New Bearings: .015 Inch Pounds

Used Bearings: .015 Inch Pounds

Model #62

Carrier Type: Integral

Ring Gear & Pinion Backlash:

Method: Shims

Adjustment: .005" to .009"

Pinion Bearing Preload:

Method: Shims

New Bearings: 20 to 40 Inch Pounds

Used Bearings: 10 to 20 Inch Pounds

Differential Bearing Preload:

Method: Shims

New Bearings: .015 Inch Pounds

Used Bearings: .015 Inch Pounds

Brake Specifications:

All Models except Aerobus:

Brake Drum Diameter: 11"

Wheel Cylinder Bore:

Front Disc: 2-15/16"

Front Drum: 1-1/8"

Rear Drum: 15/16"

Master Cylinder Bore:

Disc Brakes: 1-1/8"

Drum Brakes: 1"

Power Brakes: 1"

Aerobus:

Brake Drum Diameter: 11"

Wheel Cylinder Bore:

Front Drum: 1-1/8"

Rear Drum: 1"

Master Cylinder Bore:

Power Brakes: 1"

Capacities:

6 Cylinder Models:

Cooling System:

With Heater: 12 Quarts

With Air Conditioning: 12 Quarts

Radiator Cap Pressure:

With Air Conditioning: 13 PSI

Without Air Conditioning: 13 PSI

Thermostat Opening: 195 Degrees

Fuel Tank: 21-1/2 Gallons

Engine Oil Refill with New Filter: 5 Quarts

Transmission:

Automatic Transmission: 8-1/2 Quarts

Rear Axle: 3 Pints

8 Cylinder Models, Marathon & Taxi:

Cooling System:

With Heater: 17 Quarts

With Air Conditioning: 17 Quarts

Radiator Cap Pressure:

With Air Conditioning: 13 PSI

Without Air Conditioning: 13 PSI

Thermostat Opening: 195 Degrees

Fuel Tank: 23 Gallons

Engine Oil Refill with New Filter: 5 Quarts

Transmission:

Automatic Transmission: 8-1/2 Quarts

Rear Axle: 3 Pints

8 Cylinder Models, Aerobus:

Cooling System:

With Heater: 21 Quarts

With Air Conditioning: 21 Quarts

Radiator Cap Pressure:

With Air Conditioning: 13 PSI

Without Air Conditioning: 13 PSI

Thermostat Opening: 195 Degrees

Fuel Tank: 23 Gallons

Engine Oil Refill with New Filter: 5 Quarts

Transmission:

Automatic Transmission: 8-1/2 Quarts

Rear Axle: 6 Pints

Wheel Alignment:

Marathon & Taxi:

Caster: + 2 Degrees

Camber:

Left: + 0 to 1 Degrees

Right: 0 to 1 Degrees

Toe In: 1/16" to 1/8"

Aerobus:

Caster: + 2 Degrees

Camber:

Left: + 1 to 2 Degrees

Right: 1 to 2 Degrees

Toe In: 1/8" to 3/16"

Rochester Carburetor Specifications:

1 Barrel:

Carburetor #: 7041014

Float Level: 1/4"

Metering Rod: .080"

Fast Idle, Bench Adjustment: .100"

Choke Rod: .160"

Vacuum Break: .200"

Unloader: .350"

Fast Idle: 900 RPM, on low step of cam.

2 Barrel:

Carburetor #: 7041114

Float Level: 25/32"

Float Drop: 1-5/8"

Pump Rod: 1-17/32"

Vacuum Break: .170"

Choke Rod: .100"

Choke Unloader: .325"

1971 CHECKER

Popular Options:

Power Steering, Power Brakes, Air Conditioning, Whitewall Tires, Full Wheel Discs, Two-Tone Paint, Heavy Duty Shock Absorbers, Jump Seats, Power Side Windows, Heavy Duty Battery, Limited Slip Differential, V-8 Engine, Automatic Transmission on 6 Cylinder, Overdrive on 6 Cylinder.

1971 Checker Historical Data:

Automatic Transmission was standard equipment on 8 cylinder models.

1971 Checker Model Year introduction was on September 1, 1970.

Model Year Production:

600 Private Passenger Cars

3,900 Taxi Cabs

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