1975 MERCURY COMET

Model Designations:

Mercury Comet, 6 & 8 Cylinder

Mercury Comet, 6 & 8 Cylinder, Body Styles:

2 Door Sedan, 6 Passenger, Body # 31

Factory Price: $3,236; Shipping Weight: 3,070 Pounds

Production Total: 22,768*

4 Door Sedan, 6 Passenger, Body # 30

Factory Price: $3,270; Shipping Weight: 3,193 Pounds

Production Total: 31,080*

* 6 & 8 Cylinder Production is combined.

Chassis:

Wheelbase:

2 Doors: 103"

4 Doors: 109"

Tire Sizes: BR78 X 14"

Engine Availability by Model:

I-6 200 Cubic Inches 75 H.P. Standard Engine

I-6 250 Cubic Inches 72 H.P. Optional Engine

V-8 302 Cubic Inches 122 H.P. Optional Engine

General Engine Specifications:

6 Cylinder, 200 Cubic Inch, 75 H.P. Engine:

Engine Type: Overhead Valve, Inline 6

Bore & Stroke: 3.68" x 3.13"

Engine Displacement: 200 Cu. In.

Compression Ratio: 8.30

Taxable Horsepower: 32.50

Horsepower: 75 @ 3,200 RPM

Torque: Not Avilable

Normal Oil Pressure: 30-50 PSI

Carburetor: 1 Barrel

6 Cylinder, 250 Cubic Inch, 72 H.P. Engine (Except California Cars):

Engine Type: Overhead Valve, Inline 6

Bore & Stroke: 3.68" x 3.91"

Engine Displacement: 250 Cu. In.

Compression Ratio: 8.0

Taxable Horsepower: 32.50

Horsepower: 72 @ 2,900 RPM

Torque: 180 Ft. Lbs @ 1,400 RPM

Normal Oil Pressure: 40-60 PSI

Carburetor: 1 Barrel

6 Cylinder, 250 Cubic Inch, 70 H.P. Engine (California Cars):

Engine Type: Overhead Valve, Inline 6

Bore & Stroke: 3.68" x 3.91"

Engine Displacement: 250 Cu. In.

Compression Ratio: 8.0

Taxable Horsepower: 32.50

Horsepower: 70 @ 2,800 RPM

Torque: 175 Ft. Lbs @ 1,400 RPM

Normal Oil Pressure: 40-60 PSI

Carburetor: 1 Barrel

8 Cylinder, 302 Cubic Inch, 122 H.P. Engine (Except California Cars):

Engine Type: Overhead Valve, V-8

Bore & Stroke: 4.00" x 3.00"

Engine Displacement: 302 Cu. In.

Compression Ratio: 8.00:1

Taxable Horsepower: 51.20

Horsepower: 122 @ 3,800 RPM

Torque: 208 Ft. Lbs @ 1,800 RPM

Normal Oil Pressure: 40-60 PSI

Carburetor: 2 Barrel

8 Cylinder, 302 Cubic Inch, 115 H.P. Engine (California Cars):

Engine Type: Overhead Valve, V-8

Bore & Stroke: 4.00" x 3.00"

Engine Displacement: 302 Cu. In.

Compression Ratio: 8.00:1

Taxable Horsepower: 51.20

Horsepower: 115 @ 3,600 RPM

Torque: 203 Ft. Lbs @ 1,400 RPM

Normal Oil Pressure: 40-60 PSI

Carburetor: 2 Barrel

Tune Up Specifications - All Series:

6 Cylinder 200 Cubic Inch Engine:

Spark Plug Type: Autolite BRF-82

Spark Plug: Gap .044"

Firing Order: 1-5-3-6-2-4

Ignition Timing: 6 Degrees BTDC

Engine Idle Speed:

Standard Transmission: 750 RPM

Automatic Transmission: 600 RPM in Drive

6 Cylinder 250 Cubic Inch Engine:

Spark Plug Type: Autolite BRF-82

Spark Plug: Gap .044"

Firing Order: 1-5-3-6-2-4

Ignition Timing: 6 Degrees BTDC

Engine Idle Speed:

Standard Transmission: 750 RPM

Automatic Transmission: 600 RPM in Drive

8 Cylinder 302 Cubic Inch Engine:

Spark Plug Type: Autolite BRF-42

Spark Plug: Gap .044"

Firing Order: 1-5-4-2-6-3-7-8

Ignition Timing: 6 Degrees BTDC

Engine Idle Speed:

Standard Transmission: 900 RPM

Automatic Transmission: 650 RPM in Drive

Valve Specifications:

6 Cylinder Engines, 200 Cubic Inch:

Valve Lash:

Intake: .079"-.209"

Exhaust: .079"-.129"

Valve Angles:

Seat: 45 Degrees

Face: 44 Degrees

Valve Spring Height, Installed: 1-19/32"

Valve Spring Pressure: 150 Lbs @ 1.22"

Valve Stem Clearance:

Intake .0008"-.0025"

Exhaust .0010"-.0027"

Valve Stem Diameter:

Intake: .3100"-.3107"

Exhaust: .3098"-.3105"

6 Cylinder Engines, 250 Cubic Inch:

Valve Lash:

Intake: .112"-.176"

Exhaust: .095"-.145"

Valve Angles:

Seat: 45 Degrees

Face: 44 Degrees

Valve Spring Height, Installed:

Intake: 1-19/32

Exhaust: 1-9/16"

Valve Spring Pressure: 150 Lbs @ 1.18"

Valve Stem Clearance:

Intake .0008"-.0025"

Exhaust .0010"-.0027"

Valve Stem Diameter:

Intake: .3100"-.3107"

Exhaust: .3098"-.3105"

8 Cylinder 302 Cubic Inch Engine:

Valve Lash:

Intake: .115"-.165"

Exhaust: .090"-.140"

Valve Angles:

Seat: 45 Degrees

Face: 44 Degrees

Valve Spring Height, Installed:

Intake: 1-45/64"

Exhaust: 1-39/64"

Valve Spring Pressure:

Intake: 200 Lbs @ 1.31"

Exhaust: 200 Lbs. @ 1.22"

Valve Stem Clearance:

Intake .0010"-.0027"

Exhaust .0015"-.0032"

Valve Stem Diameter:

Intake: .3416"-.3423"

Exhaust: .3411"-.3418"

Piston, Rings, Pins, Crankshaft & Bearing Data:

6 Cylinder, 200 Cubic Inch Engines:

Piston Clearance: .0013"-.0021"

Ring End Gap:

Compression: .008"

Oil: .015"

Wrist Pin Diameter: .9121"

Rod Bearings:

Shaft Diameter: 2.136"

Bearing Clearance: .0008"-.0026"

Main Bearings:

Shaft Diameter: 2.2486"

Bearing Clearance: .0008"-.0024"

Thrust on Bearing: #5

Crankshaft End Play: .004"-.008"

6 Cylinder, 250 Cubic Inch Engines:

Piston Clearance: .0013"-.0021"

Ring End Gap:

Compression: .008"

Oil: .015"

Wrist Pin Diameter: .9121"

Rod Bearings:

Shaft Diameter: 2.136"

Bearing Clearance: .0008"-.0024"

Main Bearings:

Shaft Diameter: 2.3986"

Bearing Clearance: .0008"-.0024"

Thrust on Bearing: #5

Crankshaft End Play: .004"-.008"

8 Cylinder, 302 Cubic Inch Engine:

Piston Clearance: .0018"-.0026"

Ring End Gap:

Compression: .010"

Oil: .015"

Wrist Pin Diameter: .9121"

Rod Bearings:

Shaft Diameter: 2.1228"-2.1236"

Bearing Clearance: .0008"-.0026"

Main Bearings:

Shaft Diameter: 2.2486"

Bearing Clearance: .0005"-.0024"

Thrust on Bearing #3

Crankshaft End Play: .004"-.008"

Engine Tightening Specifications:

6 Cylinder Engines, 200 Cubic Inch:

Spark Plugs: 15-25 Ft. Lbs.

Cylinder Head Bolts: 70-75 Ft. Lbs.

Intake Manifold: 30-35 Ft. Lbs.

Exhaust Manifold: 13-18 Ft. Lbs.

Rocker Arm Shaft Bracket: 30-35 Ft. Lbs.

Rocker Arm Cover: 3-5 Ft. Lbs.

Connecting Rod Cap Bolts: 21-26 Ft. Lbs.

Main Bearing Cap Bolts: 60-70 Ft. Lbs.

Flywheel to Crankshaft: 75-85 Ft. Lbs.

Vibration Damper or Pulley: 85-100 Ft. Lbs.

6 Cylinder Engines, 250 Cubic Inch:

Spark Plugs: 15-25 Ft. Lbs.

Cylinder Head Bolts: 70-75 Ft. Lbs.

Intake Manifold: 18-24 Ft. Lbs.

Exhaust Manifold: 13-18 Ft. Lbs.

Rocker Arm Shaft Bracket: 30-35 Ft. Lbs.

Rocker Arm Cover: 3-5 Ft. Lbs.

Connecting Rod Cap Bolts: 21-26 Ft. Lbs.

Main Bearing Cap Bolts: 60-70 Ft. Lbs.

Flywheel to Crankshaft: 75-85 Ft. Lbs.

Vibration Damper or Pulley: 85-100 Ft. Lbs.

8 Cylinder 302 Cubic Inch Engines:

Spark Plugs: 10-15 Ft. Lbs.

Cylinder Head Bolts: 65-72 Ft. Lbs.

Intake Manifold: 23-25 Ft. Lbs.

Exhaust Manifold: 18-24 Ft. Lbs.

Rocker Arm Studs: 17-23 Ft. Lbs.

Rocker Arm Cover: 3-5 Ft. Lbs.

Connecting Rod Cap Bolts: 19-24 Ft. Lbs.

Main Bearing Cap Bolts: 60-70 Ft. Lbs.

Flywheel to Crankshaft: 75-85 Ft. Lbs.

Vibration Damper or Pulley: 70-90 Ft. Lbs.

Capacities-All Series:

6 Cylinder 200 Cubic Inch Engine:

Cooling System:

Without Heater: 8 Quarts

With Heater: 9 Quarts

With Air Conditioning: 9 Quarts

Radiator Cap Pressure:

With Air Conditioning: 12-16 PSI

Without Air Conditioning: 12-16 PSI

Thermostat Opening: 191 Degrees

Fuel Tank: 19.2 Gallons

Engine Oil Refill: 5 Quarts*

Manual Transmission:

Three Speed: 3-1/2 Pints

Automatic Transmission: 7.8 Quarts

Rear Axle: 4 Pints

* With New Oil Filter

6 Cylinder 250 Cubic Inch Engine:

Cooling System:

Without Heater: 8 Quarts

With Heater: 9.7 Quarts

With Air Conditioning: 9.7 Quarts

Radiator Cap Pressure:

With Air Conditioning: 12-16 PSI

Without Air Conditioning: 12-16 PSI

Thermostat Opening: 191 Degrees

Fuel Tank: 19.2 Gallons

Engine Oil Refill: 5 Quarts*

Manual Transmission:

Three Speed: 3-1/2 Pints

Automatic Transmission: 8.8 Quarts

Rear Axle: 4 Pints

* With New Oil Filter

8 Cylinder 302 Cubic Inch Engine:

Cooling System:

With Heater: 13-1/2 Quarts

With Air Conditioning: 14.1 Quarts

Radiator Cap Pressure:

With Air Conditioning: 12-16 PSI

Without Air Conditioning: 12-16 PSI

Thermostat Opening: 191 Degrees

Fuel Tank: 19.2 Gallons

Engine Oil Refill: 5 Quarts*

Manual Transmission:

Three Speed: 3-1/2 Pints

Automatic Transmission: 8.8 Quarts

Rear Axle: 4 Pints

* With New Oil Filter

Starting Motor Specifications:

6 Cylinder 200 Cubic Inch Engines:

Part #D2OF-BA

Brush Spring Tension: 80 Ounces

No Load Test: 80 Amperes, 12 Volts

Torque Test: 670 Amperes, 5.0 Volts, @ 15-1/2 Ft. Lbs.

Part #D2ZF- CA

Brush Spring Tension: 80 Ounces

No Load Test: 80 Amperes, 12 Volts

Torque Test: 670 Amperes, 5.0 Volts, @ 15-1/2 Ft. Lbs.

6 Cylinder 250 Cubic Inch Engines:

Part #D5OF-BA

Brush Spring Tension: 80 Ounces

No Load Test: 80 Amperes, 12 Volts

Torque Test: 670 Amperes, 5.0 Volts, @ 15-1/2 Ft. Lbs.

302 Cubic Inch 8 Cylinder Engines:

Part #D5OF-BA

Brush Spring Tension: 80 Ounces

No Load Test: 80 Amperes, 12 Volts

Torque Test: 670 Amperes, 5.0 Volts, @ 15-1/2 Ft. Lbs.

Ford Alternator Specifications:

Note: Not all alternators shown are available on the Comet.

Purple, 38 Ampere Alternator:

Current Rating: 38 Amperes @ 15 Volts

Field Current @ 75 Degrees: 2.9 Amperes @ 12 Volts

Voltage Regulator #D4TZ-A

Orange, 42 Ampere Alternator:

Current Rating: 42 Amperes @ 15 Volts

Field Current @ 75 Degrees: 2.9 Amperes @ 12 Volts

Voltage Regulator #D4TZ-A

Red, 55 Ampere Alternator:

Current Rating: 55 Amperes @ 15 Volts

Field Current @ 75 Degrees: 2.9 Amperes @ 12 Volts

Voltage Regulator #D4TZ-A

Green, 61 Ampere Alternator:

Current Rating: 61 Amperes @ 15 Volts

Field Current @ 75 Degrees: 2.9 Amperes @ 12 Volts

Voltage Regulator #D4TZ-A

70 Ampere Alternator:

Current Rating: 70 Amperes @ 15 Volts

Field Current @ 75 Degrees: 2.9 Amperes @ 12 Volts

Voltage Regulator #D4TZ-A

90 Ampere Alternator:

Current Rating: 90 Amperes @ 15 Volts

Field Current @ 75 Degrees: 2.9 Amperes @ 12 Volts

Voltage Regulator #D4TZ-A

Distributor Specifications:

Note: Not distributors shown are available on the Comet

Part #D3ZF-AA

Centrifugal Advance:

Advance Starts: 0 to 2 Degrees @ 775 RPM

Intermediate Advance: 2 to 4 Degrees @ 975 RPM

Intermediate Advance: 5.4 to 7.7 Degrees @ 1,500 RPM

Full Advance: 10-3/4 Degrees @ 2,500 RPM

Vacuum Advance Data:

Advance Starts @ 6" Vacuum

Full Advance: 13-1/2 Degrees @ 24" Vacuum

Part #D4OF-EA

Centrifugal Advance:

Advance Starts: 0 to 2 Degrees @ 520 RPM

Intermediate Advance: 4-1/2 to 7-1/2 Degrees @ 800 RPM

Intermediate Advance: 10 to 12-1/2 Degrees @ 1,500 RPM

Full Advance: 17-3/4 Degrees @ 2,000 RPM

Vacuum Advance Data:

Advance Starts @ 4" Vacuum

Full Advance: 13 Degrees @ 17" Vacuum

Part #D3VE-CA

Centrifugal Advance:

Advance Starts: 0 to2 Degree @ 825 RPM

Intermediate Advance: 4 to 6 Degrees @ 1,025 RPM

Intermediate Advance: 7 to 9-1/4 Degrees @ 1,500 RPM

Intermediate Advance: 8-1/3 to 11-1/4 Degrees @ 2,000 RPM

Full Advance: 12-1/2 Degrees @ 2,500 RPM

Vacuum Advance Data:

Advance Starts @ 4" Vacuum

Full Advance: 11-3/4 Degrees @ 14.6" Vacuum

Part #D5AE-BA

Centrifugal Advance:

Advance Starts: 0 to 2-1/2 Degree @ 975 RPM

Intermediate Advance: 3-3/4 to 6-1/4 Degrees @ 750 RPM

Full Advance: 11-1/4 Degrees @ 2,150 RPM

Vacuum Advance Data:

Advance Starts @ 4" Vacuum

Full Advance: 13-1/4 Degrees @ 13" Vacuum

Part #D5AE-DA

Centrifugal Advance:

Advance Starts: 0 to 2-1/2 Degrees @ 975 RPM

Intermediate Advance: 3-3/4 to 6-1/4 Degrees @ 750 RPM

Full Advance: 11-1/4 Degrees @ 2,150 RPM

Vacuum Advance Data:

Advance Starts @ 4.3" Vacuum

Full Advance: 15-1/4 Degrees @ 13" Vacuum

Part #D5AE-EA

Centrifugal Advance:

Advance Starts: 0 to 2-1/2 Degrees @ 975 RPM

Intermediate Advance: 3-3/4 to 6-1/4 Degrees @ 1,500 RPM

Full Advance: 11-1/4 Degrees @ 2,150 RPM

Vacuum Advance Data:

Advance Starts @ 3" Vacuum

Full Advance: 13-1/4 Degrees @ 11" Vacuum

Part #D5DE-HA

Centrifugal Advance:

Advance Starts: 0 to 2 Degrees @ 550 RPM

Intermediate Advance: 3-1/2 to 5-1/2 Degrees @ 1,00 RPM

Intermediate Advance: 7 to 9-1/4 Degrees @ 1,500 RPM

Intermediate Advance: 10-1/2 to 13 Degrees @ 2,000 RPM

Full Advance: 16-1/2 Degrees @ 2,500 RPM

Vacuum Advance Data:

Advance Starts @ 4.5" Vacuum

Full Advance: 13-1/4 Degrees @ 19" Vacuum

Brake Specifications, Passenger Cars, All Series

6 & 8 Cylinder Passenger Cars:

Brake Drum Diameter: 10.00"

Wheel Cylinder Bore:

Front Disc: 2.600"

Front Drum: 1.125"

Rear: .843"

Master Cylinder Bore:

Disc Brakes: .938"

Drum Brakes: .938"

Power Brakes: .938"

Rear Axle, All Models:

Carrier Type: Integral

Ring Gear & Pinion Backlash: .008"-.012"

Nominal Pinion Locating Shim: .030"

Pinion Bearing Preload:

With New Bearings: 17-27 Inch Pounds

With Used Bearings: 8-14 Inch Pounds

Differential Bearing Preload: .008"-.012"

Pinion Nut Torque: 140 Ft. Lbs.

Carrier Type: Removable

Ring Gear & Pinion Backlash: .008"-.012"

Nominal Pinion Locating Shim: .015" (With 8" Ring Gear: .022")

Pinion Bearing Preload:

With New Bearings:

With Seal: 17-27 Inch Pounds

With Solid Spacer: 13-33 Inch Pounds

With Used Bearings: 8-14 Inch Pounds

Differential Bearing Preload:

With New Bearings: .008"-.012"

With Used Bearings:

6-3/4" Ring Gear: .003"-.005"

8" Ring Gear: .005"-.008"

9" Ring Gear: .005"-.008"

Pinion Nut Torque:

With Collapsible Spacer: 170 Ft. Lbs.

With Solid Spacer: 200 Ft. Lbs.

Wheel Alignment Specifications:

All Models:

Caster: -1/2 Degrees

Camber:

Left: + 1/4 Degree

Right: + 1/4 Degree

Toe-In: 1/8"

Toe-Out on Turns:

Outer Wheel:

Manual Steering: 18.36 Degrees

Power Steering: 18.13 Degrees

Inner Wheel: 20 Degrees

Ford Carburetor Adjustments:

Note: See 1975 Ford Motor Company Carburetors Data File

Popular Options:

AM Radio & Antenna; AM-FM Multiplex Radio; AM-FM Monural Radio; AM-FM Multiplex Radio; Automatic Transmission; White Wall Tires; Deluxe Wheel Covers; Air Conditioning; Front & Rear Bumper Guards; Rear Window Defogger; Power Steering; Tinted Glass; Two-Tone Paint; Glamour Paint; Vinyl Roof; Bucket Seats; DeLuxe Wheel Covers; DeLuxe Left & Right Remote Control Racing Mirrors; Trim Rings with Hubcaps; Various Trim Optionns; Heavy Duty Battery; Various Trim Options; Engine & Transmission Options; and Much More.

1975 Mercury Historical Data:

Introduction date of the 1975 Mercury Comet was on September 27, 1974.

Total Mercury Production for the1975 model year was 404,650 including 53,848 Comets.

1975 Mercury Colors & Codes:

1-C Black

1-G Silver

1-H Medium Slate Blue

2-B Bright Red

2-E Red

2-M Dark Red

2-Q Maroon

3-G Dark Blue

3-K Bright Blue Glamour

3-M Silver Blue Glamour

3-Q Medium Pastel Blue

4-T Ivy Bronze Glamour

4-V Dark Yellow Green

4-Z Light Green Gold

5-J Ginger Glamour

5-M Medium Copper

5-Q Dark Brown

5-T Saddle Bronze

5-U Tan Glamour

5-W Orange

5-Y Dark Copper

6-D Yellow

6-E Bright Yellow

8-C Medium Gold

9-D White

47 Light Green

Promotional Models Available:

None

Copyright 2001, Custom Solutions & Services