Target Audience:
Owners and mechanics of Mazda RX4 vehicles seeking in-depth repair and maintenance knowledge.
Manual Value:
Provides essential technical data often unavailable in owner's manuals, crucial for maintaining rotary engines.
Comprehensiveness:
Focuses specifically on the engine service and repair, offering detailed procedures for the unique rotary powerplant.
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.
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.
Depth:
Comprehensive engine rebuild and diagnostic procedures, including internal component specifications and tolerances. Suitable for professional mechanics and experienced DIY enthusiasts.
Quality:
High-resolution, searchable PDF with clear diagrams and text.
Scalability:
Optimized for printing, with sharp lines and legible text for diagrams.
Digital Format Advantage:
Instant download, easily accessible on multiple devices, printable pages.
Digital Equivalent:
No physical paper; delivered as a digital file.
Engine Type:
Mazda 13B Rotary (Wankel)
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.
Horsepower Range:
Approximately 100-135 hp (depending on market and emission controls)
Torque Range:
Approximately 110-130 lb-ft
Carburetion:
Twin-choke downdraft carburetors (e.g., Hitachi SH20, Mikuni PHH)
Fuel Type:
Unleaded gasoline (91 RON or higher recommended)
Ignition Timing:
Typically specified in degrees Before Top Dead Center (BTDC), adjustable via distributor.
Coolant Type:
Ethylene glycol based antifreeze/coolant mixture (50/50 recommended).
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.
Emissions Control Systems:
Thermal reactor, EGR (Exhaust Gas Recirculation), air injection (depending on market and year).
Transmission Type:
4-speed Manual
Transmission Type:
3-speed Automatic (TorqueFlite based or Mazda's own design)
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).
Oil Change Interval:
Typically every 3,000-5,000 miles (4,800-8,000 km) or 3-6 months, whichever comes first.
Spark Plug Inspection Replacement:
Inspect every 15,000 miles (24,000 km), replace as needed. Rotary spark plugs are critical.
Air Filter Replacement:
Inspect every 7,500 miles (12,000 km), replace as needed or annually.
Coolant Flush Interval:
Every 2 years or 30,000 miles (48,000 km).
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid.
Manual Transmission Fluid:
API GL-4 gear oil, SAE 75W-90 or 80W-90 (capacity approx. 1.8-2.0 liters).
Apex Seal Wear:
Common issue with high-mileage rotary engines, leading to loss of compression, poor starting, and rough running. Requires engine rebuild.
Carburetor Issues:
Deterioration of rubber components, vacuum leaks, and tuning challenges common with older carburetors.
Oil Consumption:
Rotary engines inherently consume some oil for lubrication; the manual will detail normal consumption rates and how to monitor.
Cooling System Leaks:
Aging hoses, seals, and potential corrosion in the cooling system. Overheating can be detrimental to rotary engines.
