Mazda RX-3 1975 Factory Service Repair Manual

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🏷️ Basic Information Identification Make: Mazda Model: RX-3 Year: 1975 Product Type: Factory Service Repair Manual Codes Chassis Codes: AP (Sedan), AB (Coupe), AC (Wagon) Engine Codes: 10A (Rotary) 👋...

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标签: 1975 Car Cars Mazda RX Models RX-3

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Description

🏷️ Basic Information

Identification

Make:

Mazda

Model:

Year:

Product Type:

Factory Service Repair Manual

Codes

Chassis Codes:

AP (Sedan), AB (Coupe), AC (Wagon)

Engine Codes:

10A (Rotary)

👋 Introduction

Market Position

Era Context:

The RX-3 was Mazda's affordable, sporty compact offering in the mid-1970s, competing with Japanese and American small cars.

Niche:

Known for its compact size, distinctive styling, and especially its rotary engine, offering a unique driving experience.

Competitive Analysis

Competitors:

Datsun 240Z/260Z (though higher performance/price), Toyota Corolla, Honda Civic, Ford Pinto, Chevrolet Vega.

Key Features

Rotary Engine:

The primary differentiator; smooth operation, high-revving nature, and unique sound.

Styling:

Sporty coupe and sedan designs, often praised for their clean lines.

Handling:

Lightweight chassis and good weight distribution contributed to agile handling.

Manual Purpose

Utility:

Essential resource for owners and mechanics to maintain, diagnose, and repair the 1975 Mazda RX-3.

📋 Manual Details

Coverage Areas

Primary Coverage:

Mazda RX-3 1975

Secondary Coverage:

All variations of the 1975 Mazda RX-3 model

Page Count

Estimated Page Count:

Manual Type

Type:

Factory Service Manual / Workshop Manual

Language

Language:

English

Format

Format:

Digital (likely PDF, often scanned or digitally reproduced)

📖 Manual Coverage

Systems Covered

Engine Mechanical:

Rotary engine (10A) disassembly, assembly, inspection, and repair

Engine Fuel System:

Carburetor (likely Hitachi/Mikuni), fuel pump, fuel lines, tank inspection and service

Engine Ignition System:

Distributor, ignition coils, spark plugs, timing adjustment

Cooling System:

Radiator, water pump, thermostat, hoses, fan

Lubrication System:

Oil pump, oil filter, oil passages, oil pan

Transmission Manual:

4-speed manual gearbox, clutch operation, removal, disassembly, assembly

Transmission Automatic:

Optional 3-speed automatic gearbox (if applicable to 1975 models), operation and service

Drivetrain:

Driveshaft, rear axle, differential, wheel bearings

Suspension Front:

MacPherson strut system, springs, shock absorbers, control arms, ball joints

Suspension Rear:

Leaf spring suspension, shock absorbers

Steering System:

Steering gear box, steering column, linkages

Braking System:

Front disc brakes, rear drum brakes, master cylinder, brake lines, parking brake

Electrical System:

Wiring diagrams, battery, alternator, starter motor, lighting, gauges, switches

Body And Chassis:

Body panel removal/installation, door mechanisms, glass, trim

HVAC:

Heating and ventilation system operation and service

Procedures Included

Preventive Maintenance:

Oil changes, filter replacements, tune-ups, fluid checks

Troubleshooting:

Diagnostic charts, symptom-to-cause analysis

Repair Procedures:

Detailed step-by-step instructions for component removal, disassembly, repair, and reassembly

Adjustment Procedures:

Carburetor adjustments, ignition timing, clutch free play, brake adjustments

Installation Procedures:

Component installation, accessory fitting

Torque Specifications:

Crucial torque values for engine, chassis, and drivetrain components

Wiring Diagrams:

Comprehensive electrical schematics for all vehicle systems

Technical Depth

Depth:

Comprehensive; covers from basic maintenance to complete engine rebuilds and major component overhauls.

Diagnostics:

Includes diagnostic procedures and specifications for troubleshooting common and complex issues.

📊 Manual Specifications

File Format

Digital Format:

Likely PDF, offering searchability and printability.

Print Quality

Quality:

Variable depending on source scan quality; often clear enough for detailed use.

Binding Type

Binding:

N/A (Digital format)

Paper Type

Paper:

N/A (Digital format)

⚙️ Engine Specifications

Primary Engine

Engine Type:

Wankel Rotary

Engine Code:

Displacement:

993 cc (combined chamber volume)

Rotor Design:

Two-rotor design

Performance

Horsepower Net:

Approx. 110 hp @ 6,500 rpm (for US-spec models, exact figures can vary by market)

Torque Net:

Approx. 118 lb-ft @ 3,500 rpm (for US-spec models, exact figures can vary by market)

Redline:

Approx. 7,000 rpm

Fuel System

Carburetor:

Single 2-barrel carburetor (e.g., Hitachi HMC 34, or similar depending on market/emission standards)

Fuel Type:

Unleaded gasoline (91 octane or higher recommended for optimal performance)

Oil Injection:

Separate oil injection system for apex seal lubrication is standard on rotary engines.

Cooling System

Cooling Type:

Water-cooled

Lubrication System

Oil Capacity:

Approx. 5.3 US quarts (5.0 liters) including filter

Oil Specification:

API SF/CD or equivalent, SAE 20W-50 or 10W-40 depending on climate. Consult manual for specifics.

🔧 Transmission

Standard

Type:

4-speed Manual Transaxle

Optional

Type:

3-speed Automatic Transaxle (may be market-specific)

Features

Drive Layout:

Rear-wheel drive (RWD) with integrated transmission and differential.

Fluid Capacity

Manual Transmission Fluid Capacity:

Approx. 2.5 US quarts (2.3 liters)

Automatic Transmission Fluid Capacity:

Consult manual (typically around 4-5 quarts, including torque converter)

Fluid Specification

Manual Transmission Fluid Type:

GL-4 Hypoid gear oil, SAE 80W-90 or 75W-90. Consult manual for specifics.

Automatic Transmission Fluid Type:

Dexron II or equivalent. Consult manual for specifics.

📐 Dimensions

Exterior

Length:

Approx. 160.0 inches (4064 mm) for Coupe, slightly longer for Sedan/Wagon

Width:

Approx. 63.0 inches (1600 mm)

Height:

Approx. 52.0 inches (1321 mm) for Coupe, slightly higher for Sedan/Wagon

Wheelbase:

Approx. 95.7 inches (2431 mm)

Weights

Curb Weight:

Approx. 2,100 - 2,300 lbs (950 - 1040 kg) depending on body style and equipment

Wheels Tires

Wheel Size:

13-inch or 14-inch steel wheels with hubcaps

Tire Size:

Typically 175/70SR13 or 185/70SR13. Consult manual for exact fitments.

Bolt Pattern:

4x110mm

🛡️ Safety Features

Ratings

Historical Ratings:

Modern safety rating data is not available for vehicles of this era.

Active Features

Brakes:

Front disc brakes, rear drum brakes. No ABS.

Passive Features

Seatbelts:

Lap belts standard, shoulder belts often optional or standard on higher trims.

Structure:

Unibody construction typical of the era. No advanced crumple zones or advanced safety structures.

💡 Technology Features

Infotainment

Radio:

AM/FM radio, possibly with an 8-track player or cassette as an option.

Gauges:

Standard array of analog gauges: speedometer, tachometer, fuel level, coolant temperature, oil pressure. Oil metering gauge may be present.

Driver Assistance

Features:

No electronic driver assistance features. Focus on mechanical systems and driver control.

Connectivity

Features:

No modern connectivity features. Primarily mechanical and basic electrical systems.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 3,000 miles (4,800 km) or 3 months, whichever comes first. Consult manual for specific recommendation.

Spark Plug Replacement:

Typically every 15,000-20,000 miles (24,000-32,000 km) for rotary plugs. Specific intervals in manual.

Air Filter Replacement:

Every 15,000 miles (24,000 km) or as needed based on driving conditions.

Fuel Filter Replacement:

Every 15,000 miles (24,000 km) or annually.

Fluid Specifications

Coolant:

50/50 mix of ethylene glycol coolant and distilled water. Consult manual for specific capacity.

Brake Fluid:

DOT 3 or DOT 4 brake fluid.

Known Issues

Apex Seals:

Wear of apex seals is a common concern for older rotary engines, leading to compression loss. Proper pre-mix and maintenance are crucial.

Carburetor Tuning:

Carburetors may require frequent adjustment due to their complexity and sensitivity to vacuum leaks.

Oil Consumption:

Rotary engines inherently consume a small amount of oil for lubrication, which is normal. Excessive consumption indicates potential issues.

Cooling System Maintenance:

Regular flushing and replacement of coolant are vital to prevent overheating, a potential issue with rotary engines.

📚 Vehicle History

Brand Heritage

Mazda Rotary Pioneering:

Mazda is the sole mass-producer of the Wankel rotary engine, starting with the Cosmo and gaining significant traction with the RX series.

Model Evolution

Previous Generation:

RX-2 (Capella Rotary)

Successor:

RX-4 (Cosmo AP Rotary)

Production

Production Years:

1972-1977

Manufacturing Location:

Japan

Significance

Market Impact:

Established Mazda's reputation for sporty, affordable cars with unique technology (rotary engine).

🏆 Awards & Recognition

Recognitions

Historical Accolades:

While the RX-3 itself might not have specific major awards, the rotary engine technology it championed was groundbreaking and recognized by the automotive industry for innovation.