The Mazda RX3, produced between 1971 and 1978, is a compact sports coupe and sedan renowned for its distinctive styling and the pioneering rotary (Wankel) engine technology that defined its performance. This model offered a unique driving experience, characterized by agile handling and spirited acceleration, positioning it as a compelling alternative to contemporary sports cars. Its appeal lay in the innovative powertrain, relatively affordable performance, and the distinct character of Mazda's rotary engine legacy. This comprehensive workshop service manual provides in-depth guidance for the maintenance and repair of the Mazda RX3 models from 1970 to 1978. It covers essential areas including detailed procedures for engine systems, drivetrain, chassis, and electrical components, along with scheduled maintenance, troubleshooting diagnostics, and technical specifications. This manual serves as an indispensable resource for owners, mechanics, and technicians seeking to preserve the performance and longevity of their RX3. 🏷️ Basic Information Identification Make: Mazda Model: RX3 Generation Codes: S107A, S124A, S132A (internal chassis codes) 👋 Introduction Market Position Segment Placement: Compact sports coupe/sedan, aimed at performance enthusiasts seeking a distinctive driving experience. Competitive Analysis Key Competitors: Datsun 240Z, Toyota Corolla Levin/Sprinter Trueno (AE86 precursor), Ford Escort RS, various European small sports cars of the era. Key Features Unique Selling Points: Rotary engine technology, distinctive styling, agile handling, relatively affordable performance. 📋 Manual Details Coverage Areas Manual Years Covered: 1970, 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978 Page Count Estimated Pages: 800-1200 (typical for comprehensive workshop manuals of this era) Manual Type Manual Type: Workshop Service Manual / Repair Manual Language Language: English Format Format: PDF (Downloadable) 📖 Manual Coverage Systems Covered Engine Systems: Rotary engine theory, lubrication, cooling, fuel delivery (carbureted), ignition, emissions control (early systems), engine disassembly/assembly, troubleshooting Drivetrain Systems: Clutch operation, manual transmission disassembly/assembly/adjustment, rear axle servicing, driveshaft inspection and repair Chassis Systems: Front and rear suspension (independent front, leaf spring rear), steering system diagnosis and repair, brake system overhaul (front discs, rear drums typical), wheel alignment specifications Electrical Systems: Wiring diagrams, lighting, ignition switch, starter motor, alternator, battery, gauges, horn, fuses and relays, troubleshooting electrical faults Body And Trim: Door mechanisms, window regulators, seat adjustment, interior trim removal/installation, exterior trim, panel gaps Procedures Included Maintenance Procedures: Scheduled maintenance (oil changes, filter replacements, spark plug checks, belt adjustments), fluid level checks, lubrication points Repair Procedures: Engine rebuild (rotary apex seals, rotor housing inspection), transmission rebuild, brake caliper/wheel cylinder overhaul, carburetor rebuilding, suspension component replacement Troubleshooting Diagnostics: Step-by-step diagnostic charts for common engine, electrical, and mechanical problems Technical Depth Depth Of Coverage: Comprehensive: Covers from basic maintenance to complete engine and transmission overhauls, including torque specifications, clearances, and diagnostic procedures. 📊 Manual Specifications File Format PDF Quality: High-resolution scans, searchable text (OCR'd) Print Quality Print Readability: Optimized for printing, clear diagrams and text Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Type: Rotary (Wankel) Engine Engine Displacements: 571 cc x 2 rotors (1142 cc total displacement equivalent), 654 cc x 2 rotors (1308 cc total displacement equivalent) Engine Code Examples: 12A (early, 571cc), 12A (later, 654cc) Performance Horsepower Range: 80-110 hp (net) depending on year and emissions equipment Torque Range: 75-95 lb-ft (net) depending on year and emissions equipment Fuel System Fuel Delivery: Single or dual downdraft carburetors (e.g., Hitachi/Aisan, Mikuni Solex) Fuel Type: Unleaded gasoline (as mandated by emissions regulations during its production run) 🔧 Transmission Standard Transmission Type Standard: 4-speed manual transmission Optional Transmission Type Optional: 3-speed automatic transmission Features Clutch Type: Dry single plate clutch 📐 Dimensions Exterior Body Styles: 2-door Coupe, 4-door Sedan, 5-door Wagon (RX3 Station Wagon), 2-door Rotary Sports Coupe (R100 often associated, but RX3 had its own variants) Wheelbase: Approx. 95.5 inches (2425 mm) Length: Approx. 161.8 - 165.7 inches (4110 - 4209 mm) depending on body style Width: Approx. 63.8 inches (1620 mm) Height: Approx. 53.0 - 54.7 inches (1345 - 1390 mm) depending on body style Weights Curb Weight Range: Approx. 2000 - 2350 lbs (907 - 1066 kg) Wheel Bolt Pattern: 4x110 mm 🛡️ Safety Features Ratings Crash Test Data: Limited official crash test data available from this era, however, typical safety features for the period include padded dashboards and seatbelts. Active Features Braking System: Front disc brakes, Rear drum brakes Passive Features Seatbelts: Standard lap and shoulder belts (front), lap belts (rear) 💡 Technology Features Infotainment Audio System: Factory AM/FM radio with optional cassette player Driver Assistance ABS Availability: Not available Power Steering: Optional on some models Connectivity Connectivity Features: None (pre-digital era) 🔧 Maintenance Service Intervals Oil Change Interval: Every 3,000 miles (4,800 km) or 3 months Spark Plug Inspection Interval: Every 6,000 miles (9,600 km) Air Filter Replacement: As needed, typically every 12,000 miles (19,200 km) or annually Fluid Specifications Engine Oil Specification: API SF or SG, SAE 10W-30...