🏷️ Basic Information Identification Make: Mazda Model: RX-4 Year: 1973 👋 Introduction Market Position Market Positioning: The 1973 Mazda RX-4 represented Mazda's continued commitment to rotary engine technology in the compact and mid-size car segments. It competed against a range of Japanese and American vehicles, offering unique performance characteristics derived from its Wankel engine. Competitive Analysis Key Competitors: Datsun (Nissan) 510, Toyota Corona, Ford Pinto, Chevrolet Vega, AMC Gremlin Key Features Unique Selling Points: Smooth rotary engine operation, distinctive styling, good power-to-weight ratio for its class, innovative technology for the era. 📋 Manual Details Coverage Areas All Models Covered: True All Repairs A Z: True Page Count Estimated Page Count: Approximately 400-600 pages (typical for comprehensive factory service manuals of this era) Manual Type Manual Type: Factory Service Manual / Repair Manual Language Language: English Format Format: Printed Manual (Original or High-Quality Reproduction) 📖 Manual Coverage Systems Covered Engine: Rotary Engine (12A) - Theory of Operation, Disassembly, Assembly, Inspection, Lubrication, Cooling, Ignition, Fuel System, Emissions Control Transmission: Manual Transmission (4-speed, 5-speed) and Automatic Transmission (3-speed) - Overhaul, Adjustments, Driveline Components Brakes: Front Disc Brakes, Rear Drum Brakes - Inspection, Service, Hydraulic System, Adjustment, Bleeding Suspension: Front Independent Suspension (MacPherson Strut), Rear Leaf Spring Suspension - Component Inspection, Bushing Replacement, Shock Absorber Service, Alignment Specifications Steering: Recirculating Ball Steering System - Inspection, Adjustment, Tie Rod End Service, Steering Column Electrical: Starting System, Charging System (Alternator), Ignition System, Lighting System, Instrumentation, Wiring Diagrams, Fuses, Relays, Switches, Power Accessories Fuel System: Carburetion (Hitachi/Nikki Twin-Choke), Fuel Pump, Fuel Lines, Fuel Tank - Cleaning, Adjustment, Jetting, Troubleshooting Cooling System: Water-Cooled Rotary Engine, Radiator, Fan, Thermostat, Hoses - Flush, Antifreeze Specifications, Component Replacement Exhaust System: Exhaust Manifold, Pipes, Muffler - Inspection, Gasket Replacement Body And Interior: Body Panel Repair, Door Mechanisms, Window Regulators, Seat Adjustments, Interior Trim, Upholstery Procedures Included Routine Maintenance: Oil Changes, Filter Replacements, Spark Plug Service, Fluid Level Checks, Tire Rotation Troubleshooting: Diagnostic Charts, Symptom-Based Troubleshooting Guides, Component Testing Procedures Engine Overhaul: Apex Seal Replacement, Rotor Housing Inspection, Eccentric Shaft Service, Seal Kit Installation Transmission Rebuild: Gear Disassembly, Bearing Replacement, Synchro Ring Service, Clutch Assembly (Manual Transmission) Brake Service: Pad/Shoe Replacement, Rotor/Drum Machining, Caliper/Wheel Cylinder Rebuild, Bleeding Procedure Electrical Diagnostics: Wiring Diagram Interpretation, Voltage Drop Testing, Component Testing (Starter, Alternator, Ignition Coil) Carburetor Adjustment: Idle Speed, Air-Fuel Mixture, Float Level Adjustment Tune Up Procedures: Ignition Timing, Spark Plug Gap, Carburetor Settings Wheel Alignment: Camber, Caster, Toe-in Specifications and Adjustment Procedures Technical Depth Depth Of Coverage: Comprehensive, technician-level detail covering diagnostics, repair, overhaul, and adjustment for all major vehicle systems. 📊 Manual Specifications File Format File Format: Typically printed paper, but digital versions (PDF) are also common for resale. High resolution and searchable text are key for digital. Print Quality Print Quality: Original manuals are often black and white with clear line drawings and diagrams. High-quality reproductions maintain clarity. Binding Type Binding Type: Stapled, perfect bound, or hardcover for professional manuals. Spiral binding is also common for ease of use. Paper Type Paper Type: Durable, semi-gloss paper suitable for workshop environments. ⚙️ Engine Specifications Primary Engine Engine Type: Rotary (Wankel) Engine Code: 12A Engine Configuration: Two-Rotor, Naturally Aspirated Displacement: 1146 cc (approx. 69.9 cubic inches) - Note: Rotary displacement is often calculated differently than piston engines. Performance Horsepower: Approximately 100-110 hp (SAE Gross) depending on specific market and emissions equipment. Torque: Approximately 110-120 lb-ft (SAE Gross) Fuel System Carburetor: Hitachi (or Nikki) Twin-Choke Downdraft Carburetor Fuel Type: Unleaded Gasoline (though leaded gasoline was still common in 1973, early unleaded compatibility is a consideration) Ignition System Ignition Type: Distributor-based, Single Ignition Coil Lubrication Oil Type: API SF or SG rated, SAE 10W-30 or 10W-40 (refer to manual for exact specifications and potential specific rotary oil requirements) Cooling System Cooling Type: Water-cooled 🔧 Transmission Standard Standard Transmission: 4-speed Manual Transmission Optional Optional Transmission: 3-speed Automatic Transmission Features Clutch Type: Single Dry Plate Clutch (Manual Transmission) Transmission Fluid Type: GL-4 Hypoid Gear Oil (Manual), Dexron III or equivalent (Automatic - verify specific spec in manual) Driveshaft Driveshaft Type: Single-piece driveshaft with universal joints. 📐 Dimensions Exterior Wheelbase: Approx. 98.4 inches (2500 mm) Length: Approx. 169.3 inches (4300 mm) Width: Approx. 65.0 inches (1651 mm) Height: Approx. 53.1 inches (1350 mm) Weights Curb Weight: Approx. 2300 - 2500 lbs (1043 - 1134 kg), varies by body style and equipment. Tires Standard Tire Size: Typically 175 SR 13 or similar radial tires (confirm with manual) Wheels Wheel Bolt Pattern: 4 x 110 mm (common for Mazda of this era) 🛡️ Safety Features Ratings Safety Ratings: NHTSA or IIHS ratings for this era are not directly comparable to modern standards. Focus is on passive safety features of the time. Active Features Braking System: Front Disc Brakes, Rear Drum Brakes Passive Features Seatbelts: Standard lap belts, potential for optional shoulder belts....