1975 MERCURY BOBCAT

Model Designations:

Mercury Bobcat, 4 & 6 Cylinder

Mercury Bobcat, 4 & 6 Cylinder, Body Styles:

3 Door Hatchback, 4 Passenger, Body # 20

Factory Price: $3,189; Shipping Weight: Not Available

Production Total: 20,651*

2 Door Villager Station Wagon, 4 Passenger, Body # 21

Factory Price: $3,481; Shipping Weight: Not Available

Production Total: 13,583*

* Includes 6 Cylinder Production

Chassis:

Wheelbase:

Passenger Cars: 94.5"

Station Wagons: 94.8"

Tire Sizes:

B78 X 13"

Engine Availability by Model:

I-4 140 Cubic Inches 85.5 H.P. Standard Engine

V-6 170 Cubic Inches 97 H.P. Optional Engine on Hatchbacks & Wagons

General Engine Specifications:

4 Cylinder, 140 Cubic Inch, 85.5 H.P. Engine:

Engine Type: Overhead Cam, Inline 4

Bore & Stroke: 3.781" x 3.126"

Engine Displacement: 140 Cu. In.

Compression Ratio: 8.40

Taxable Horsepower: 22.87

Horsepower: 85.5 @ 4,800 RPM

Torque: 113 Ft. Lbs @ 2,600 RPM

Normal Oil Pressure: 40-60 PSI

Carburetor: 2 Barrel

6 Cylinder, 171 Cubic Inch, 97 H.P. Engine:

Engine Type: Overhead Valve, V-Type 6 Cylinder

Bore & Stroke: 3.66" x 2.70"

Engine Displacement: 177 Cu. In.

Compression Ratio: 8.20

Taxable Horsepower: 32.15

Horsepower: 97

Torque: Not Available

Normal Oil Pressure: 40-60 PSI

Carburetor: 2 Barrel

Tune Up Specifications - All Series:

4 Cylinder, 140 Cubic Inch Engine:

Spark Plug Type: AGRF-52

Spark Plug: Gap .034"

Firing Order: 1-3-4-2

Ignition Timing:

Standard Transmission: 6 Degrees BTDC

Automatic Transmission, except California Cars: 6 Degrees BTDC

Automatic Transmission, California Cars: 10 Degrees BTDC

Engine Idle Speed:

Standard Transmission: 850 RPM

Automatic Transmission: 750 RPM in Drive

6 Cylinder, 171 Cubic Inch Engine:

Spark Plug Type: AGR-42

Spark Plug: Gap .034"

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

Ignition Timing:

Standard Transmission: 6 Degrees BTDC

Automatic Transmission, except California Cars: 10 Degrees BTDC

Automatic Transmission, California Cars: 8 Degrees BTDC

Engine Idle Speed:

Standard Transmission: 850 RPM

Automatic Transmission: 700 RPM in Drive

Valve Specifications:

4 Cylinder Engines, 140 Cubic Inch:

Valve Lash:

Intake: .008" Cold

Exhaust: .010" Cold

Valve Angles:

Seat: 45 Degrees

Face: 44 Degrees

Valve Spring Height, Installed: 1.56"

Valve Spring Pressure: 189 Lbs @ 1.16"

Valve Stem Clearance:

Intake .0010"-.0027"

Exhaust .0015"-.0032"

Valve Stem Diameter:

Intake: .3416"-.3423"

Exhaust: .3411"-.3418"

6 Cylinder Engines, 171 Cubic Inch:

Valve Lash:

Intake: .014" Hot

Exhaust: .016" Hot

Valve Angles:

Seat: 45 Degrees

Face: 44 Degrees

Valve Spring Height, Installed: 1.593"

Valve Spring Pressure: 144 Lbs @ 1.222"

Valve Stem Clearance:

Intake .0008"-.0025"

Exhaust .0018"-.0035"

Valve Stem Diameter:

Intake: .3158"-.3167"

Exhaust: .3149"-.3156"

Piston, Rings, Pins, Crankshaft & Bearing Data:

4 Cylinder 140 Cubic Inch Engines:

Piston Clearance: .0023"-.0039"

Ring End Gap:

Compression: .010"

Oil: .015"

Wrist Pin Diameter: .9120"

Rod Bearings:

Shaft Diameter: 2.0472"

Bearing Clearance: .0008"-.0024"

Main Bearings:

Shaft Diameter: 2.3990"

Bearing Clearance: .0008"-.0026"

Thrust on Bearing #3

Crankshaft End Play: .004"-.008"

6 Cylinder 171 Cubic Inch Engines:

Piston Clearance: .0020"-.0036"

Ring End Gap:

Compression: .015"

Oil: .016"

Wrist Pin Diameter: .9456"

Rod Bearings:

Shaft Diameter: 2.1256"

Bearing Clearance: .0006"-.0021"

Main Bearings:

Shaft Diameter: 2.2437"

Bearing Clearance: .0006"-.0019"

Thrust on Bearing #3

Crankshaft End Play: .004"-.008"

Engine Tightening Specifications:

4 Cylinder 140 Cubic Inch Engines:

Spark Plugs: 10-15 Ft. Lbs.

Cylinder Head Bolts: 80-90 Ft. Lbs.

Intake Manifold: 14-21 Ft. Lbs.

Exhaust Manifold: 16-23 Ft. Lbs.

Rocker Arm Cover: 4-7 Ft. Lbs.

Connecting Rod Cap Bolts: 30-36 Ft. Lbs.

Main Bearing Cap Bolts: 80-90 Ft. Lbs.

Flywheel to Crankshaft: 54-64 Ft. Lbs.

Vibration Damper or Pulley: 80-114 Ft. Lbs.

6 Cylinder 171 Cubic Inch Engines:

Spark Plugs: 14-22 Ft. Lbs.

Cylinder Head Bolts: 65-80 Ft. Lbs.

Intake Manifold: 15-18 Ft. Lbs.

Exhaust Manifold: 14-18 Ft. Lbs.

Rocker Arm Stud Nut: 9-25 Ft. Lbs.

Rocker Arm Cover: 3-5 Ft. Lbs.

Connecting Rod Cap Bolts: 21-25 Ft. Lbs.

Main Bearing Cap Bolts: 65-75 Ft. Lbs.

Flywheel to Crankshaft: 47-51 Ft. Lbs.

Vibration Damper or Pulley: 92-103 Ft. Lbs.

Capacities-All Series:

4 Cylinder 140 Cubic Inch Engine:

Cooling System:

With Heater: 8-3/4 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:

Hatchback: 13 Gallons

Station Wagon: 14 Gallons

With Auxiliary Tank: Add 3-1/2 Gallons

Engine Oil Refill: 5 Quarts*

Manual Transmission:

Four Speed: 2.8 Pints

Automatic Transmission:

C3 Transmission: 8 Quarts

C4 Transmission: 9 Quarts

Rear Axle: 2.2 Pints

6 Cylinder 171 Cubic Inch Engine:

Cooling System:

With Heater: 12-1/2 Quarts

With Air Conditioning: 13-1/4 Quarts

Radiator Cap Pressure:

With Air Conditioning: 12-16 PSI

Without Air Conditioning: 12-16 PSI

Thermostat Opening: 186 Degrees

Fuel Tank:

Hatchback: 13 Gallons

Station Wagon: 14 Gallons

With Auxiliary Tank: Add 3-1/2 Gallons

Engine Oil Refill: 5 Quarts*

Manual Transmission:

Four Speed: 2.8 Pints

Automatic Transmission:

C3 Transmission: 8 Quarts

C4 Transmission: 9 Quarts

Rear Axle: 2.2 Pints

* With New Oil Filter

Starting Motor Specifications:

4 Cylinder Engines:

Part #D42F-BA

Brush Spring Tension: 40 Ounces

No Load Test: 70 Amperes

Torque Test: 460 Amperes, 5.0 Volts, @ 9 Ft. Lbs.

6 Cylinder Engines:

Part #D4ZF-BA

Brush Spring Tension: 40 Ounces

No Load Test: 70 Amperes

Torque Test: 460 Amperes, 5.0 Volts, @ 9 Ft. Lbs.

Ford Alternator Specifications:

Purple, 38 Ampere

Current Rating: 38 Amperes @ 15 Volts

Field Current @ 75 Degrees: 2.9 Amperes @ 12 Volts

Voltage Regulator #D4AF-AA

Voltage @ 75 Degrees: 13.5-15.3 Volts

Field Relay:

Closing Voltage @ 75 Degrees: 2.5 to 4.0 Volts

Orange, 42 Ampere

Current Rating: 42 Amperes @ 15 Volts

Field Current @ 75 Degrees: 2.9 Amperes @ 12 Volts

Voltage Regulator #DD4AF-AA

Voltage @ 75 Degrees: 13.5-15.3 Volts

Field Relay:

Closing Voltage @ 75 Degrees: 2.5 to 4.0 Volts

70 Ampere

Current Rating: 70 Amperes @ 15 Volts

Field Current @ 75 Degrees: 2.9 Amperes @ 12 Volts

Voltage Regulator #D4TF-AA

Voltage @ 75 Degrees: 13.5-15.3 Volts

Field Relay:

Closing Voltage @ 75 Degrees: 2.5 to 4.0 Volts

Green, 61 Ampere

Current Rating: 61 Amperes @ 15 Volts

Field Current @ 75 Degrees: 2.9 Amperes @ 12 Volts

Voltage Regulator #D4TF-AA

Voltage @ 75 Degrees: 13.5-15.3 Volts

Field Relay:

Closing Voltage @ 75 Degrees: 2.5 to 4.0 Volts

Red 55 Ampere

Current Rating: 55 Amperes @ 15 Volts

Field Current @ 75 Degrees: 2.9 Amperes @ 12 Volts

Voltage Regulator #D4AF-AA

Voltage @ 75 Degrees: 13.5-15.3 Volts

Field Relay:

Closing Voltage @ 75 Degrees: 2.5 to 4.0 Volts

40 Ampere

Current Rating: 40 Amperes @ 15 Volts

Field Current @ 75 Degrees: 2.9 Amperes @ 12 Volts

Voltage Regulator #D4AF-AA

Voltage @ 75 Degrees: 13.5-15.3 Volts

Field Relay:

Closing Voltage @ 75 Degrees: 2.5 to 4.0 Volts

60 Ampere

Current Rating: 60 Amperes @ 15 Volts

Field Current @ 75 Degrees: 2.9 Amperes @ 12 Volts

Voltage Regulator #D4TF-AA

Voltage @ 75 Degrees: 13.5-15.3 Volts

Field Relay:

Closing Voltage @ 75 Degrees: 2.5 to 4.0 Volts

Distributor Specifications:

Note: Only Mercury Bobcat Distributors are shown here.

Part #D5DE-KA

Centrifugal Advance:

Advance Starts: 0 to 2 Degrees @ 775 RPM

Intermediate Advance: 2-3/4 to 4-3/4 Degrees @ 950 RPM

Intermediate Advance: 4-3/4 to 7 Degrees @ 1,000 RPM

Intermediate Advance: 6-3/4 to 9-1/4 Degrees @ 2,000 RPM

Full Advance: 10-3/4 to 14 Degrees @ 2,350 RPM

Vacuum Advance Data:

Advance Starts @ 4" Vacuum

Full Advance: 11-1/4 Degrees @ 14-1/2" Vacuum

Maximum Retard: 3 Degrees @ 7" Vacuum

Part #D5DE-NA

Centrifugal Advance:

Advance Starts: 0 to 2 Degrees @ 550 RPM

Intermediate Advance: 2-1/2 to 4-1/2 Degrees @ 675 RPM

Intermediate Advance: 3-3/4 to 6 Degrees @ 1,100 RPM

Intermediate Advance: 7 to 9-1/2 Degrees @ 2,000 RPM

Full Advance: 11-1/2 Degrees @ 2,500 RPM

Vacuum Advance Data:

Advance Starts @ 4" Vacuum

Full Advance: 11-1/4 Degrees @ 14-1/2" Vacuum

Part #D5ZE-AA

Centrifugal Advance:

Advance Starts: 0 to 2 Degrees @ 600 RPM

Intermediate Advance: 1 to 3 Degrees @ 650 RPM

Intermediate Advance: 2-3/4 to 5 Degrees @ 1,000 RPM

Intermediate Advance: 5-1/4 to 7-1/2 Degrees @ 1,500 RPM

Full Advance: 13 Degrees @ 2,500 RPM

Vacuum Advance Data:

Advance Starts @ 4.8" Vacuum

Full Advance: 5-3/4 Degrees @ 7-1/2" Vacuum

Part #D52E-EA

Centrifugal Advance:

Advance Starts: 0 to 2 Degrees @ 675 RPM

Intermediate Advance: 5-1/4 to 7-1/4 Degrees @ 1,025 RPM

Intermediate Advance: 7-1/2 to 9-3/4 Degrees @ 1,500 RPM

Intermediate Advance: 10 to 12-1/2 Degrees @ 2,000 RPM

Full Advance: 14 to 14 Degrees @ 2,250 RPM

Vacuum Advance Data:

Advance Starts @ 4" Vacuum

Full Advance: 5-1/4 Degrees @ 7" Vacuum

Part #D52E-FA

Centrifugal Advance:

Advance Starts: 0 to 2 Degrees @ 725 RPM

Intermediate Advance: 5-1/2 to 7-1/2 Degrees @ 1,125 RPM

Intermediate Advance: 7-3/4 to 10 Degrees @ 1,500 RPM

Intermediate Advance: 10-3/4 to 13-1/4 Degrees @ 2,000 RPM

Full Advance: 14 Degrees @ 2,150 RPM

Vacuum Advance Data:

Advance Starts @ 4" Vacuum

Full Advance: 5-1/4 Degrees @ 7-1/2" Vacuum

Maximum Retard: 3 Degrees @ 7-1/2" Vacuum

Part #75TF-EA

Centrifugal Advance:

Advance Starts: 0 to 2 Degrees @ 650 RPM

Intermediate Advance: 2 to 4 Degrees @ 800 RPM

Intermediate Advance: 5 to 7 Degrees @ 1,200 RPM

Intermediate Advance: 8 to 10 Degrees @ 1,600 RPM

Full Advance: 10 Degrees @ 2,000 RPM

Vacuum Advance Data:

Advance Starts @ 4-1/4" Vacuum

Full Advance: 3 Degrees @ 6-3/4" Vacuum

Maximum Retard: 6 Degrees @ 6-3/4" Vacuum

Brake Specifications, Passenger Cars, All Series

All:

Brake Drum Diameter: 9.00"

Wheel Cylinder Bore:

Front Disc: 2.60"

Rear: .875"

Master Cylinder Bore:

Front Disc: .9375"

Power Brakes: .9375"

Rear Axle, All Models:

Carrier Type: Integral

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

Nominal Pinion Locating Shim: .030"

Method: Shims

Pinion Bearing Preload:

With New Bearings with Seal: 17-27 Inch Pounds

With Used Bearings with Seal: 6-12 Inch Pounds

Differential Bearing Preload:

With New Bearings: .008"-.012"

With Used Bearings: .003"-.005"

Pinion Nut Torque: 140 Ft. Lbs.

Carrier Type: Removable

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

Nominal Pinion Locating Shim: .022"

Method: Shims

Pinion Bearing Preload:

With New Bearings with Seal: 17-27 Inch Pounds

With Used Bearings with Seal: 8-14 Inch Pounds

Differential Bearing Preload:

With New Bearings: .004"-.008"

With Used Bearings: .003"-.005"

Pinion Nut Torque: 170 Ft. Lbs.

Wheel Alignment Specifications:

Passenger Cars:

Caster: + 1-1/4 Degrees

Camber:

Left: + 3/4 Degree

Right: + 3/4 Degree

Toe-In: 1/8"-3/8"

Toe-Out:

Outer Wheel: 18.84"

Inner Wheel: 20"

Station Wagons:

Caster: + 1-1/2 Degrees

Camber:

Left: + 3/4 Degree

Right: + 3/4 Degree

Toe-In: 1/8"-3/8"

Toe-Out:

Outer Wheel: 18.84"

Inner Wheel: 20"

Ford Carburetor Adjustments:

Note: See 1975 Ford Motor Company Carburetors Data File

Popular Options:

AM Radio & Antenna; AM-FM Stereo Radio; Automatic Transmission; Power Steering; Vinyl Roof; Tinted Glass; Air Conditioning; Climate Control; Cruise Control; Sport Accent Group; White Wall Tires; Wheel Covers; Aluminum Wheels; Luggage Rack for Station Wagon; 6 Cylinder Engine; and Much More.

1975 Mercury Historical Data:

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

Total Mercury Production for the1975 model year was 404,650 including 34,234 Bobcats.

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

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