The Mazda RX4, produced from 1972 to 1977, represents a significant chapter in automotive history, showcasing Mazda's pioneering spirit with its rotary (Wankel) engine technology. Available in sedan, coupe, and wagon body styles, with chassis codes S124A and LA2VS respectively, the RX4 was engineered to deliver a unique driving experience powered by the compact yet potent 12A rotary engine. This engine, displacing 654 cc per rotor, offered an equivalent displacement of 1308 cc and produced between 100-135 horsepower, providing smooth power delivery and a distinct engine note. Its innovative design and performance capabilities helped establish Mazda's reputation for engineering excellence and cemented the rotary engine's place in the automotive landscape. This comprehensive workshop service repair manual provides in-depth technical information essential for the maintenance, diagnosis, and repair of your Mazda RX4. It covers critical systems including the rotary engine (12A), fuel system, ignition, cooling, and lubrication. Detailed procedures for routine maintenance, troubleshooting common issues such as apex seal wear and carburetor problems, and complete engine rebuilds are included. Furthermore, the manual offers vital specifications, torque values, and tolerances, making it an indispensable resource for owners and mechanics alike to ensure the optimal performance and longevity of this iconic rotary-powered vehicle. 🏷️ Basic Information Identification Make: Mazda Model: RX4 Model Codename: S124A (Sedan/Coupe), LA2VS (Wagon) Codes Chassis Codes: S124A, LA2VS 👋 Introduction Market Position Target Audience: Owners and mechanics of Mazda RX4 vehicles seeking in-depth repair and maintenance knowledge. Competitive Analysis Manual Value: Provides essential technical data often unavailable in owner's manuals, crucial for maintaining rotary engines. Key Features Comprehensiveness: Focuses specifically on the engine service and repair, offering detailed procedures for the unique rotary powerplant. 📋 Manual Details Coverage Areas Engine: Rotary (12A) Fuel System: Carburetor and Injection (depending on market/variant) Ignition System: Electronic Cooling System: Water-cooled Lubrication System: Wet sump Page Count Estimated Pages: 300-500 (typical for comprehensive workshop manuals) Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Disassembly, inspection, assembly, timing, seals, gaskets, rotor housings, apex seals, eccentric shaft, oil pump, water pump, intake manifold, exhaust manifold. Fuel And Emission Control: Carburetor adjustment and overhaul (e.g., Hitachi, Mikuni), fuel pump, fuel filter, emissions control systems (e.g., EGR, thermal reactor). Ignition System: Distributor, ignition coils, spark plugs, wiring, timing adjustments, electronic control unit (ECU) if applicable. Cooling System: Radiator, coolant hoses, thermostat, water pump, fan, coolant specifications. Lubrication System: Engine oil, oil filter, oil pan, oil pump, oil cooler, oil specifications. Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug checks, coolant flushes, lubrication points. Troubleshooting: Diagnosis of common engine problems, electrical issues, starting problems, performance issues, diagnostic charts. Repair And Overhaul: Detailed step-by-step instructions for engine rebuilds, component replacement (e.g., seals, bearings, ignition components), carburetor overhauls. Specifications And Tolerances: Torque values, clearances, measurements, rebuild specifications for critical engine components. Technical Depth Depth: Comprehensive engine rebuild and diagnostic procedures, including internal component specifications and tolerances. Suitable for professional mechanics and experienced DIY enthusiasts. 📊 Manual Specifications File Format Quality: High-resolution, searchable PDF with clear diagrams and text. Print Quality Scalability: Optimized for printing, with sharp lines and legible text for diagrams. Binding Type Digital Format Advantage: Instant download, easily accessible on multiple devices, printable pages. Paper Type Digital Equivalent: No physical paper; delivered as a digital file. ⚙️ Engine Specifications Primary Engine Engine Type: Mazda 13B Rotary (Wankel) Engine Code: 12A Rotor Displacement: 654 cc per rotor (total 1308 cc equivalent displacement) Rotor Housing Material: Cast iron or similar durable alloy Apex Seal Material: Historically, carbon or phenolic resin, later variations used metal composites. Performance Horsepower Range: Approximately 100-135 hp (depending on market and emission controls) Torque Range: Approximately 110-130 lb-ft Fuel System Carburetion: Twin-choke downdraft carburetors (e.g., Hitachi SH20, Mikuni PHH) Fuel Type: Unleaded gasoline (91 RON or higher recommended) Ignition System Ignition Timing: Typically specified in degrees Before Top Dead Center (BTDC), adjustable via distributor. Cooling System Coolant Type: Ethylene glycol based antifreeze/coolant mixture (50/50 recommended). Lubrication System Oil Capacity: Approximately 5.5-6.0 quarts (5.2-5.7 liters) with filter change. Oil Viscosity Recommendation: API SG or higher, SAE 10W-30 or 10W-40 commonly recommended for varying temperatures. Other Emissions Control Systems: Thermal reactor, EGR (Exhaust Gas Recirculation), air injection (depending on market and year). 🔧 Transmission Standard Transmission Type: 4-speed Manual Optional Transmission Type: 3-speed Automatic (TorqueFlite based or Mazda's own design) Features Gear Ratios Manual: Specific ratios for 1st, 2nd, 3rd, 4th, and Reverse gears would be detailed in the manual. Automatic Transmission Fluid Type: Dexron II or equivalent automatic transmission fluid (ATF). 📐 Dimensions Exterior Length: Sedan/Coupe: ~4250 mm (167.3 in) Width: Sedan/Coupe: ~1600 mm (63.0 in) Height: Sedan/Coupe: ~1375 mm (54.1 in) Weights Curb Weight: Approximately 1150-1250 kg (2535-2755 lbs) 🛡️ Safety Features Ratings Crash Test Data: Limited comprehensive modern crash test data...