Mazda RX3 1970-1978 WSM Service Manual Repair

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Art.-Nr: 92571

Stichworte: 1970 1971 1972 1973 1974 1975 1976 1977 1978 Car Cars Mazda Misc RX3

Produktvarianten

Beschreibung

The Mazda RX-3, produced from 1971 to 1978, represents a significant chapter in Mazda's automotive history, solidifying its reputation for innovative rotary engine technology. This compact sports coupe, sedan, and less common wagon variant offered a compelling blend of sporty styling, lightweight construction, and driver-focused handling, powered by the unique Mazda Rotary (Wankel) engine, available in 1.16 L (12A) and 1.30 L (13B) displacements. Its key selling points included its distinctive rotary powerplant, agile chassis, and the historical significance of establishing Mazda as a performance-oriented manufacturer. The RX-3's appeal continues to resonate with enthusiasts and restoration specialists who appreciate its unique engineering and spirited performance. This comprehensive Workshop Service Manual (WSM) provides in-depth guidance for the maintenance, repair, and technical understanding of the Mazda RX-3. Covering essential systems such as the rotary powertrain (12A and 13B engines), manual transmissions, chassis, suspension, and electrical systems, this manual details scheduled maintenance, component replacement, and diagnostic procedures. It includes extensive information on engine and transmission rebuild specifications, troubleshooting guides for common issues like apex seal wear and carburetor problems, and electrical system diagnostics. The manual is designed to assist owners, mechanics, and technicians in effectively maintaining and restoring their RX-3, ensuring its longevity and optimal performance.

🏷️ Basic Information

Identification

Make:

Mazda

Model:

Generation:

First Generation

Codes

Chassis Codes:

S102A, S124A, S132A, S133A (coupe/sedan), S135A (wagon)

Engine Codes:

12A (pre-facelift), 13B (facelift/later models)

👋 Introduction

Market Position

Segment:

Compact sports coupe/sedan/wagon

Target Audience:

Enthusiasts, DIY mechanics, restoration specialists

Competitive Analysis

Key Competitors:

Toyota Corolla Levin/Sprinter Trueno, Datsun Sunny/B210, Honda Civic

Key Features

Unique Selling Proposition:

Rotary engine, sporty styling, lightweight chassis, driver-focused handling.

Historical Significance:

Established Mazda's reputation for performance and rotary engine technology.

📋 Manual Details

Coverage Areas

Manual Type:

Workshop Service Manual (WSM) / Repair Manual

Language:

English

Format:

Digital (likely PDF, based on common industry practice for older manuals)

Page Count

Estimated Page Count:

800-1200 (typical for comprehensive WSMs of this era)

📖 Manual Coverage

Systems Covered

Powertrain:

Rotary engine (12A, 13B) theory of operation, disassembly, assembly, lubrication, cooling, fuel injection/carburetion, ignition, exhaust.

Transmission:

Manual transmission (4-speed, 5-speed), clutch system, drive shafts, rear axle.

Chassis And Suspension:

Front suspension (independent, MacPherson struts), rear suspension (leaf springs, solid axle), steering system, brakes (front discs, rear drums).

Electrical System:

Wiring diagrams, battery, charging system (alternator), starting system, lighting, instruments, accessories, engine control unit (ECU) basics.

Body And Interior:

Body panel removal/installation, door mechanisms, glass, upholstery, dashboard components.

Procedures Included

Maintenance:

Scheduled maintenance, oil changes, filter replacements, spark plug replacement, coolant flush, brake fluid change, general inspections.

Repair:

Engine rebuilding, transmission overhaul, brake caliper/master cylinder repair, suspension component replacement, electrical component diagnostics and repair.

Troubleshooting:

Diagnostic charts for common symptoms, fault finding procedures for engine, transmission, electrical, and braking systems.

Technical Depth

Diagnostics:

Detailed diagnostic procedures, component testing, specifications for electrical circuits and mechanical tolerances.

Rebuild Specifications:

Complete engine and transmission disassembly/assembly procedures with torque specifications, clearances, and component measurements.

📊 Manual Specifications

File Format

File Quality:

High-resolution scans of original factory documentation, ensuring clarity of diagrams and text.

Searchability:

Likely text-searchable if converted to PDF with OCR, allowing for quick access to specific information.

Print Quality

Printability:

Designed for printing key sections or the entire manual for workshop use.

Binding Type

Original Binding:

Likely perfect-bound or spiral-bound for original factory manuals.

Paper Type

Original Paper:

High-quality, durable paper suitable for workshop environments.

⚙️ Engine Specifications

Primary Engine

Engine Type:

Mazda Rotary (Wankel) Engine

Engine Displacement 12A:

1.16 L (67 cu in)

Engine Displacement 13B:

1.30 L (79 cu in)

Performance

Horsepower 12A:

Approx. 90-100 hp (varies by market and emission controls)

Horsepower 13B:

Approx. 110-130 hp (varies by market and emission controls)

Torque 12A:

Approx. 90-100 lb-ft

Torque 13B:

Approx. 115-125 lb-ft

Fuel System

Fuel Delivery Early:

Downdraft Carburetor (e.g., Hitachi SH220 or similar)

Fuel Delivery Late:

Fuel Injection (early electronic or mechanical systems)

Fuel Type:

Unleaded Gasoline (87 octane or higher recommended)

Engine Management

Ignition System:

Distributor-based, points or electronic ignition

Rotary Specifics

Apex Seals:

Crucial wear item, requires specific lubrication and handling.

Oil Metering:

Separate oil injection system for apex seals and side seals.

🔧 Transmission

Standard

Type:

4-Speed Manual

Optional

Type:

5-Speed Manual (later models/performance variants)

Automatic:

Rarely offered or not widely documented for this generation

Features

Clutch Type:

Dry Single Plate

Transmission Fluid

Specifications:

API GL-4 Hypoid Gear Oil (e.g., SAE 80W-90)

📐 Dimensions

Exterior

Wheelbase:

Approx. 97.4 inches (2475 mm)

Length:

Approx. 165.7 inches (4209 mm)

Width:

Approx. 63.9 inches (1623 mm)

Height:

Approx. 52.0 inches (1321 mm) (Coupe)

Weights

Curb Weight:

Approx. 2100-2400 lbs (950-1090 kg)

Wheels And Tires

Bolt Pattern:

4x110 mm

Standard Tire Size:

165/80 R13 (early), 175/70 R13 (later)

🛡️ Safety Features

Ratings

Crash Test Data:

Limited official crash test data available from this era. Vehicle designed with crumple zones typical for the time.

Active Features

Brakes:

Front disc brakes, Rear drum brakes. Power assisted optional on some models.

Passive Features

Seatbelts:

Lap belts standard, shoulder belts optional or mandated later in the production run.

Construction:

Unibody construction with integrated safety cage elements.

💡 Technology Features

Infotainment

Audio System:

Factory AM/FM radio, often with a single speaker. Cassette player optional on later models.

Driver Assistance

Not available on this generation.

Power Steering:

Optional on some models, often heavy and direct feel.

Connectivity

Connection Ports:

🔧 Maintenance

Service Intervals

Oil Change:

Every 3,000 miles (5,000 km) or 6 months, whichever comes first.

Air Filter:

Inspect every 6,000 miles (10,000 km), replace as needed.

Spark Plugs:

Replace every 12,000-18,000 miles (20,000-30,000 km) for standard plugs.

Coolant Flush:

Every 24,000 miles (40,000 km) or 2 years.

Fluid Specifications

Engine Oil:

API SF/SG, SAE 10W-30 or 10W-40 recommended. Rotary specific oil additive may be beneficial.

Coolant:

Ethylene Glycol based antifreeze (50/50 mix with distilled water). Capacity approx. 5-6 quarts.

Brake Fluid:

DOT 3 or DOT 4.

Known Issues

Rotary Engine Apex Seals:

Wear leading to compression loss, hard starting, and rough running. Requires proper maintenance and oiling.

Carburetor:

Gumming, wear, and tuning issues common with age; rebuilding or replacement may be necessary.

Electrical System:

Corrosion in connectors, failing grounds, aging wiring harnesses.

Rust And Corrosion:

Common in wheel wells, rocker panels, and floor pans due to age and climate exposure.

📚 Vehicle History

Brand Heritage

Rotary Pioneering:

Mazda's commitment to the Wankel rotary engine, starting with the Cosmo.

Model Evolution

Introduction Year:

1971 (Japan), 1972 (North America)

Body Styles:

Coupe, Sedan, Station Wagon (less common)

Facelift:

Minor styling updates, engine upgrades (13B), and improved interior in later years (around 1975).

Production

Production Period:

1971-1978

Manufacturing Location:

Japan

🏆 Awards & Recognition

Recognitions

Sporty Car Rankings:

Often cited in reviews of affordable sports cars of the 1970s.

Ratings

Enthusiast Following:

Strong cult following among rotary engine enthusiasts and vintage Japanese car collectors.