1970 Mazda RX-2 Workshop Manual

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🏷️ Basic Information Identification Make: Mazda Model: RX-2 Year: 1970 Codes Chassis Code: S102A (Coupe), S124A (Sedan) Engine Code Primary: 10A (Rotary) 👋 Introduction Market Position Era: Early 1970s sports...

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Taper: Car

Distributeur:

UGS: 272412

Mots clés: 1970 Car Cars Mazda RX Models RX-2

Variantes de produits

Description

🏷️ Basic Information

Identification

Make:

Mazda

Model:

Year:

Codes

Chassis Code:

S102A (Coupe), S124A (Sedan)

Engine Code Primary:

10A (Rotary)

👋 Introduction

Market Position

Early 1970s sports coupe/sedan, distinctive for its rotary engine.

Segment:

Compact Sporty Car / Personal Luxury Coupe

Competitive Analysis

Competitors:

Datsun 240Z, Toyota Corolla Levin/Sprinter Trueno, Ford Capri (in some markets), Alfa Romeo Giulia

Key Features

Engine Type:

Mazda's unique Wankel rotary engine, offering a smooth, high-revving power delivery.

Styling:

Often praised for its European-influenced styling, particularly the coupe variant.

Handling:

Lightweight construction and balanced chassis contributed to enjoyable handling characteristics.

Value Proposition

For Buyers:

Essential reference for owners and mechanics looking to maintain, restore, or repair this classic rotary Mazda.

📋 Manual Details

Coverage Areas

Primary Coverage:

Full Workshop and Repair

Secondary Coverage:

Maintenance, Troubleshooting, Diagnostics, Wiring Diagrams, Bodywork, Chassis, Electrical

Page Count

Estimated Pages:

Approx. 500-700 (typical for comprehensive workshop manuals of this era)

Manual Type

Type:

Workshop Manual / Service Manual / Repair Manual

Language

Language:

English

Format

Format:

PDF Download

📖 Manual Coverage

Systems Covered

Powertrain:

Rotary Engine (10A), Carburetor System, Fuel System, Ignition System, Exhaust System

Transmission:

4-Speed Manual Transmission, Optional 3-Speed Automatic Transmission

Drivetrain:

Rear Wheel Drive, Driveshaft, Differential, Axles

Chassis:

Suspension (Front: Independent Coil Spring, Rear: Leaf Spring), Steering System, Brakes (Front Disc, Rear Drum)

Electrical:

12V Electrical System, Battery, Alternator, Starter Motor, Lighting System, Gauges, Switches, Wiring Diagrams

Body:

Body Panels, Doors, Hood, Trunk, Bumpers, Interior Trim, Glass, Seals

Procedures Included

Engine Repair:

Engine Reassembly, Apex Seal Replacement, Rotor Housing Inspection, Oil Seals, Cooling System (Air-Cooled Rotary)

Transmission Service:

Transmission Fluid Change, Clutch Replacement, Gearbox Overhaul

Brakes Service:

Brake Pad/Shoe Replacement, Brake Fluid Flush, Caliper/Cylinder Rebuild

Suspension Steering:

Shock Absorber Replacement, Bushing Replacement, Wheel Alignment Specs, Steering Gearbox Adjustment

Electrical Diagnostics:

Troubleshooting Faulty Circuits, Component Testing, Fuse/Relay Identification

Scheduled Maintenance:

Oil Change Intervals, Spark Plug Replacement, Filter Changes, Lubrication Points

Bodywork Repair:

Dent Repair, Rust Treatment, Panel Replacement, Glass Installation

Technical Depth

Depth:

Comprehensive: Covers everything from basic tune-ups and fluid changes to complete engine and transmission rebuilds, electrical system diagnostics, and body repair.

Diagnostics:

Detailed troubleshooting guides with symptoms, causes, and corrective actions for common issues.

Specifications:

Includes torque specifications, clearances, tolerances, fluid capacities, and electrical resistance values.

Diagrams:

Detailed illustrations, exploded views, and wiring diagrams for precise identification and assembly.

📊 Manual Specifications

File Format

Format:

PDF (Portable Document Format)

Searchability:

Likely text-searchable PDF, allowing for quick access to specific topics.

Printability:

Printable, enabling users to create hard copies for workshop use.

Print Quality

Quality:

Digital scan quality will vary based on original source. Aim for clear, legible text and diagrams.

Binding Type

Type:

N/A (Digital Download)

Paper Type

Type:

N/A (Digital Download)

⚙️ Engine Specifications

Primary Engine

Type:

Wankel Rotary (Twin Rotor)

Engine Code:

Displacement:

993 cc (total rotating volume)

Bore Stroke Rotary:

Internal geometry rather than traditional bore/stroke; typically 105mm rotor radius with 50mm eccentric shaft throw.

Performance

Horsepower Hp:

Approx. 120-130 hp (SAE Gross) depending on market and specific tuning

Torque Lb Ft:

Approx. 118-125 lb-ft (SAE Gross) depending on market and specific tuning

Redline Rpm:

Approx. 6500-7000 RPM

Fuel System

Carburetion:

Hitachi Twin-Barrel Down-Draft Carburetor(s) (e.g., 2x Hitachi DCG 340)

Fuel Type:

Unleaded Gasoline (though leaded was common and engines might have hardened valve seats)

Cooling System

Type:

Air-Cooled (with integrated oil cooling)

Oil System

Oil Type Spec:

SAE 10W-30 or 10W-40 API SE/SF (consult manual for specific year/climate recommendations). Crucial to use oil suitable for rotary engines to prevent apex seal damage.

Oil Capacity Quarts:

Approx. 5-6 quarts (including oil cooler)

🔧 Transmission

Standard

Type:

4-Speed Manual

Optional

Type:

3-Speed Automatic (e.g., Mazdaspeed AT3)

Features

Clutch Type:

Single Dry Plate, Hydraulically Operated

Transmission Fluid Spec:

Dexron III (or equivalent) for automatic; Gear Oil GL-4 (SAE 75W-90 or 80W-90) for manual. Consult manual for exact specifications.

📐 Dimensions

Exterior

Coupe Length In:

Approx. 166.5 inches (4229 mm)

Coupe Width In:

Approx. 64.2 inches (1630 mm)

Coupe Height In:

Approx. 51.2 inches (1300 mm)

Coupe Wheelbase In:

Approx. 97.2 inches (2469 mm)

Weights

Coupe Curb Weight Lbs:

Approx. 2300-2500 lbs (1043-1134 kg)

Coupe Gross Vehicle Weight Lbs:

Approx. 3100 lbs (1406 kg)

🛡️ Safety Features

Ratings

Crash Test Era:

No standardized crash testing as per modern NHTSA/Euro NCAP standards in 1970.

Active Features

Braking System:

Front Disc Brakes, Rear Drum Brakes. No ABS or advanced brake assists.

Steering:

Recirculating Ball Steering. Optional power steering may have been available on some trims/markets.

Passive Features

Seatbelts:

Lap belts standard; shoulder belts may have been optional or standard on later production.

Airbags:

Crumple Zones:

Basic body structure design; no engineered crumple zones as understood today.

💡 Technology Features

Infotainment

Audio System:

Basic AM/FM Radio, potentially with AM only, or an optional FM/AM unit. Cassette players were not common in 1970.

Driver Assistance

Features:

N/A - This vehicle predates modern driver assistance systems.

Connectivity

Features:

N/A - No connectivity features.

🔧 Maintenance

Service Intervals

Oil Change Miles:

Typically every 3,000 miles (4,800 km) or 3 months, whichever comes first.

Filter Replacement Miles:

Oil filter at every oil change.

Spark Plug Type:

Specific long-reach platinum or copper plugs (e.g., NGK DP7EA-9 or equivalent). Requires 2 per rotor (4 total).

Spark Plug Replacement Miles:

Check/gap at 15,000 miles, replace at 30,000 miles (or as per manual).

Fluid Specifications

Coolant Type:

Water with appropriate anti-freeze (Ethylene Glycol base). Capacity approx. 3-4 quarts. No radiator cap, pressure is regulated by the engine block.

Brake Fluid Type:

DOT 3 or DOT 4. Capacity approx. 1 quart.

Known Issues

Apex Seals:

Wear and failure of apex seals is the most critical and common issue with rotary engines. Requires engine rebuild.

Carburetor Issues:

Tuning difficulties, vacuum leaks, and wear on Hitachi carburetors.

Oil Consumption:

Rotary engines inherently consume some oil for lubrication of apex seals; excessively high consumption indicates potential seal wear.

Ignition System:

Distributor, points, and coils can require regular maintenance and tuning.

Part Numbers Example

Oil Filter Part Number:

Typical: Fram PH8A, Wix 51515, or Mazda OEM (consult manual for exact fitment)

📚 Vehicle History

Brand Heritage

Mazda Rotary Pioneering:

Mazda's commitment to the Wankel rotary engine, which began with the Cosmo Sport.

Model Evolution

Predecessor:

Mazda R100 (Familia Rotary)

Successor:

Mazda RX-4 (Capella Rotary)

Production

Production Years:

1972-1978 (though manual is for 1970, implying earlier designation or very early production spec).

Manufacturing Location:

Japan

Significance

Rotary Popularity:

Key model in popularizing Mazda's rotary engine in export markets, particularly North America.

🏆 Awards & Recognition

Recognitions

Rotary Engine Impact:

While not a specific award for the RX-2 itself, it was instrumental in showcasing Mazda's rotary technology, which later earned accolades for innovation and performance.