1981 CHECKER

General Specifications:

Chasis:

Marathon:

Wheelbase: 120"

Overall Length: 204.8"

Tire Size: 215/75R15

Marathon DeLuxe

Wheelbase: 129"

Overall Length: 213.8"

Tire Size: 225/75R15

Rear Axle Ratio:

Standard Ratio 2.72:1

Body Data:

Checker Marathon Series:

6 Cylinder:

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

Base Price: $9,632; Shipping Weight: 3,680 Pounds;

8 Cylinder:

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

Base Price: $9,869; Shipping Weight: N/A Pounds;

Model A12; 4 Door DeLuxe Sedan, 6 Passenger, Body #A12E

Base Price: $10,706; Shipping Weight: 3,999 Pounds;

Note: Taxi Models are A-11 & A-11E, respectively.

Engine Specifications:

6 Cylinder Engine, 229 Cu. In. 2 Barrel Carburetor, 110 HP:

Engine Type: V-Type, 6 Cylinder, Overhead Valve

Bore & Stroke: 3.736" X 3.48"

Engine Displacement: 229 Cu. In.

Compresssion Ratio: 8.6 to 1

Taxable Horsepower: 33.5

Horsepower: 110 @ 4,200 RPM

Torque: 170 Ft. Lbs. @ 2,000 RPM

Normal Oil Pressure: 45 Lbs/Sq. In

2 Barrel Carburetor

8 Cylinder Engine-267 Cu. In., 115 HP:

Bore & Stroke: 3.50" X 3.48"

Engine Displacement: 305 Cu. In.

Compression Ratio: 8.30:1

Taxable Horsepower: 39.2

Horsepower: 115 @ 4,000 RPM

Torque: 200 Ft. Lbs @ 2,400 RPM

Normal Oil Pressure: 45 Lbs/Sq. In.

2 Barrel Carburetor

8 Cylinder Engine-305 Cu. In., 150 HP:

Bore & Stroke: 3.736" X 3.48"

Engine Displacement: 305 Cu. In.

Compression Ratio: 8.60:1

Taxable Horsepower: 44.66

Horsepower: 150 @ 3,800 RPM

Torque: 205 Ft. Lbs @ 2,400 RPM

Normal Oil Pressure: 45 Lbs/Sq. In.

2 Barrel Carburetor

8 Cylinder Engine-350 Cu. In., 105 HP (Diesel):

Bore & Stroke: 4.057" X 3.385"

Engine Displacement: 350 Cu. In.

Compression Ratio: 22.5:1

Taxable Horsepower: 52.67

Horsepower: 105 @ 3,200 RPM

Torque: 200 Ft. Lbs @ 1,600 RPM

Normal Oil Pressure: 45 Lbs/Sq. In.

Fuel Injected

Tune-Up Specifications:

6 Cylinder Engine:

Spark Plug Type: AC R45TS

Spark Plug Gap: .045"

Ignition Timing: 6 Degrees BTDC

Engine Idle Speed:

Automatic Transmission: Equipped with idle speed control motor..

Fast Idle Speed: 2,200 RPM

Fuel Pump Pressure: 4-1/2 to 6 PSI

8 Cylinder Engine, 267 Cu. In.:

Spark Plug Type: AC R46TS

Spark Plug Gap: .035"

Ignition Timing: 6 Degrees BTDC

Engine Idle Speed:

Automatic Transmission: 500 RPM in Drive (600 RPM with idle solenoid energized)

Fast Idle Speed: 2,200 RPM

Fuel Pump Pressure: 7-1/2 to 9 PSI

8 Cylinder Engine, 305 Cu. In.:

Spark Plug Type: AC R45TS

Spark Plug Gap: .045"

Ignition Timing: 6 Degrees BTDC

Engine Idle Speed:

Automatic Transmission: 500 RPM in Drive (600 RPM with idle solenoid energized)

Fast Idle Speed: 2,200 RPM

Fuel Pump Pressure: 7-1/2 to 9 PSI

8 Cylinder Engine, 350 Cu. In.:

Engine Idle Speed:

Automatic Transmission: 600 RPM in Drive

Fast Idle Speed: 750 RPM in Drive

Distributor Specifications:

Not Available. Use distributor number and refer to 1981 Chevrolet data for information.

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: 1.70"

Valve Spring Pressure: 175 Lbs. @ 1.25"

Valve Stem Clearance:

Intake: .0010" to .0027"

Exhaust: .0010" to .0027"

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: 175 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"

8 Cylinder Diesel Engines:

Valve Lash: Hydralic Lifters-No Adjustment

Valve Angles:

Seat:

Intake: 45 Degrees

Exhaust: 31 Degrees

Face:

Intake: 44 Degrees

Exhaust: 30 Degrees

Valve Spring Height, Installed: 1.67"

Valve Spring Pressure: 155 Lbs. @ 1.30"

Valve Stem Clearance:

Intake: .001" to .0027"

Exhaust: .0015" to .0032"

Valve Stem Diameter:

Intake: .3425" to .3432"

Exhaust: .3420" to .3427"

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

6 Cylinder Engine:

Piston Clearance: .0007" to .0017"

Ring End Gap:

Compression: .010"

Oil: .015"

Wrist Pin Diameter: .9272"

Rod Bearings

Shaft Diameter: 2.0986" to 2.0998"

Bearing Clearance: .0013" to .0035"

Main Bearings:

Shaft Diameter:

Front: 2.4484" to 2.4493"

Intermediate: 2.4481"-2.4490"

Rear: 2.4479"-2.4488"

Bearing Clearance:

Front: .0008"-.0020"

Intermediate: 2.4481"-2.4488"

Rear: .0017"-.0032"

Thrust on Bearing #4

Shaft End Play: .002" to .006"

8 Cylinder Engine, 267 Cu. In.:

Piston Clearance: .0007" to .0017"

Ring End Gap:

Compression: .010"

Oil: .015"

Wrist Pin Diameter: .9272"

Rod Bearings

Shaft Diameter: 2.0986" to 2.0998"

Bearing Clearance: .0013" to .0035"

Main Bearings:

Shaft Diameter:

Front: 2.4484" to 2.4493"

Intermediate: 2.4481"-2.4490"

Rear: 2.4479"-2.4488"

Bearing Clearance:

Front: .0008"-.0020"

Intermediate: 2.4481"-2.4488"

Rear: .0017"-.0032"

Thrust on Bearing #5

Shaft End Play: .002" to .006"

8 Cylinder Engine, 305 Cu. In.:

Piston Clearance: .0007" to .0017"

Ring End Gap:

Compression: .010"

Oil: .015"

Wrist Pin Diameter: .9272"

Rod Bearings

Shaft Diameter: 2.0986" to 2.0988"

Bearing Clearance: .0013" to .0035"

Main Bearings:

Shaft Diameter:

#1: 2.4484" to 2.4493"

#2, 3, 4: 2.4481" to 2.4490"

#5: 2.4475" 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"

8 Cylinder Diesel Engine, 350 Cu. In.:

Piston Clearance: .0050" to .0060"

Ring End Gap:

Compression: .020"

Oil: .035"

Wrist Pin Diameter: 1.0951"

Rod Bearings

Shaft Diameter: 2.1238" to 2.1248"

Bearing Clearance: .0005" to .0026"

Main Bearings:

Shaft Diameter: 2.9993"-3.0003"

Bearing Clearance:

#1, 2, 3, 4: .0005" to .0021"

#5: .0015" to .0031"

Thrust on Bearing #3

Shaft End Play: .0035" to .0135"

Engine Tightening Specifications:

6 Cylinder Engine:

Spark Plugs: 22 Ft. Lbs

Cylinder Heat Bolts: 65 Ft. Lbs.

Intake Manifold: 30 Ft. Lbs.

Exhaust Manifold: 20 Ft. Lbs.

Rocker Arm Cover: 45 Inch Lbs.

Connecting Rod Cap Bolts: 45 Ft. Lbs.

Main Bearing Cap Bolts: 70 Ft. Lbs.

Flywheel to Crankshaft: 60 Ft. Lbs.

Vibration Damper or Pulley: 60 Ft. Lbs.

8 Cylinder, 267 Cubic Inch Engine:

Spark Plugs: 22 Ft. Lbs

Cylinder Heat Bolts: 65 Ft. Lbs.

Intake Manifold: 30 Ft. Lbs.

Exhaust Manifold: 20 Ft. Lbs.

Rocker Arm Cover: 45 Inch Lbs.

Connecting Rod Cap Bolts: 45 Ft. Lbs.

Main Bearing Cap Bolts: 70 Ft. Lbs.

Flywheel to Crankshaft: 60 Ft. Lbs.

Vibration Damper or Pulley: 60 Ft. Lbs.

8 Cylinder Engine, 305 Cu. In.:

Spark Plugs: 22 Ft. Lbs

Cylinder Heat Bolts: 65 Ft. Lbs.

Intake Manifold: 30 Ft. Lbs.

Exhaust Manifold:: 20 Ft. Lbs.

Rocker Arm Cover: 45 Inch Lbs.

Connecting Rod Cap Bolts: 45 Ft. Lbs.

Main Bearing Cap Bolts: 70 Ft. Lbs.

Flywheel to Crankshaft: 60 Ft. Lbs.

Vibration Damper or Pulley: 60 Ft. Lbs.

8 Cylinder Diesel Engine, 350 Cu. In.:

Cylinder Heat Bolts: 130 Ft. Lbs.

Intake Manifold: 40 Ft. Lbs.

Exhaust Manifold: 25 Ft. Lbs.

Rocker Arm Pivot Bolt: 28 Ft. Lbs.

Connecting Rod Cap Bolts: 42 Ft. Lbs.

Main Bearing Cap Bolts: 120 Ft. Lbs.

Flywheel to Crankshaft: 60 Ft. Lbs.

Vibration Damper or Pulley: 200-310 Ft. Lbs.

Alternator Specifications:

Not Available. Use alternator number and refer to 1980 Chevrolet data for information.

Starting Motor Specifications:

6 Cylinder Engine:

Starter #1109524

Free Speed Test: 50-08 Amperes, 10.6 Volts @ 7,500-11,400 RPM

8 Cylinder Engine, 267 Cu. In.:

Starter #1109524

Free Speed Test: 50-80 Amperes, 10.6 Volts @ 7,500-11,400 RPM

8 Cylinder Engine, 305 Cu. In.:

Starter #1109064

No additional information available.

8 Cylinder Diesel Engine, 350 Cu. In.:

Starter #1109213

Free Speed Test: 40-140 Amperes, 9 Volts @ 8,000-13,000 RPM

Rear Axle Specifications:

Information Not Available.

Brake Specifications:

Information Not Available.

Capacities:

Fuel Tank: 21.6 Gallons

No other information is available.

Wheel Alignment:

Information is not available.

Rochester Carburetor Specifications:

2 Barrel, 6 Cylinder Engine:

Carburetor #: 17080130

No Further Information Available

2 Barrel, 267 Cubic Inch V-8:

Carburetor #17080138

No Further Information Available

2 Barrel, 305 Cubic Inch V-8:

Carburetor #1780502

No Information Available

1981 CHECKER

Popular Options:

267 Cubic Inch V-8 Engine, 305 Cubic Inch V-8 Engine, 350 Cubic Inch Diesel V-8 Engine, Trac-Lok Rear Axle, 105 Ampere Alternator, Ausiliary Transmission Cooler, Front Air Conditioning, Dual Air Conditioning, Rear Defogger, 4 Door Electric Door Locks, Rear Door Only Electric Door Locks, Tinted Glass, Right Outside Mirror, Left Hand Spotlight, Right Hand Spotlight, Auxiliary Floor Heater, Rear Helper Springs, Heavy Duty Springs, Tilt Wheel, AM Radio, AM/FM Radio, Rear Seat Speaker, Vinyl Roof, Two-Tone Paint, Quarter Window Elimination, Oval Opera Windows, Chrome Fender Shields, Auxiliary Rear Seats, Front Carpeting, Additional Ash Trays, Whitewall Tires, Heavy Duty Cooling System, Floor Reinforcement, Frame Rail Angle, Firm Ride Shock Absorbers, Skid Bar.

1981 Checker Historical Data:

Automatic Transmission, Power Disc Brakes, Power Steering, and Left Outside Mirror were Standard Equipment;

1981 Checker Model Year introduction date is not available.

Model Year Production: 2,950 cars including Marathons and Taxis.

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