🏷️ Basic Information

Make:

Mazda

Model:

RX-7

Year:

1985

Generation:

Second Generation (FB)

Chassis Code:

FB (Second Generation)

👋 Introduction

Market Position:

The 1985 Mazda RX-7 represented a significant evolution in the sports car market, offering a unique rotary engine experience at a more accessible price point than many European competitors. It catered to enthusiasts seeking performance, distinctive styling, and a driver-focused experience.

Competitive Analysis:

Competed against cars like the Toyota Celica Supra, Datsun 280ZX, and Porsche 944. Its unique rotary engine provided a distinct advantage in terms of smoothness and high-revving character, though maintenance required specialized knowledge.

Key Features:

Iconic 'FB' generation styling, lightweight chassis, balanced handling, advanced for its time independent rear suspension, and the unique Mazda Wankel rotary engine.

📋 Manual Details

Systems Covered:

Engine, Fuel System, Ignition System, Cooling System, Lubrication System, Clutch, Transmission (Manual & Automatic), Driveshaft, Differential, Suspension (Front & Rear), Steering System, Brake System, Electrical System, HVAC System, Body & Chassis, Interior Trim, Exterior Trim, Emission Control System, Wiring Diagrams

Page Count:

Estimated 1000+ pages (typical for a comprehensive factory service manual of this era)

Manual Type:

Factory Service Manual / Repair Manual

Manual Scope:

Covers all trim levels and engine variants offered for the 1985 model year of the Mazda RX-7 (FB generation).

Language:

English

Format:

Digital Download (likely PDF)

📖 Manual Coverage

Engine Systems:

Rotary engine theory of operation, disassembly, assembly, inspection, troubleshooting, specific components (rotor, housing, apex seals, side seals, oil seals, eccentric shaft, rotor housing coolant jackets, intake manifold, exhaust manifold), lubrication system diagnostics and repair (oil metering pump, oil cooler), cooling system diagnostics and repair (water pump, thermostat, radiator, coolant flow).

Fuel Ignition Emissions:

Fuel injection system (Bosch L-Jetronic or similar), fuel pump, injectors, fuel pressure regulator, throttle body, ignition system (distributor, ignition coil, spark plugs, timing adjustment), emission control systems (catalytic converter, exhaust gas recirculation - EGR, secondary air injection - SAI, air pump).

Drivetrain:

Clutch system (disc, pressure plate, release bearing), manual transmission (gearbox disassembly, assembly, gear ratios, shift mechanism), automatic transmission (if applicable to specific models), driveshaft U-joints, rear axle assembly, differential (gear ratios, bearings, seals).

Suspension Steering Brakes:

Front suspension (struts, control arms, ball joints, sway bar), rear suspension (Watt's linkage, trailing arms, coil springs, dampers), wheel bearings, steering system (rack and pinion, power steering pump, steering column), brake system (front disc, rear drum/disc, master cylinder, brake booster, calipers, wheel cylinders, brake fluid specifications and bleeding procedures), parking brake system.

Electrical HVAC Body:

12V electrical system, battery, alternator, starter motor, fuse box, relay locations, lighting system, dashboard instruments, power windows, power locks, radio system, windshield wipers and washer system, HVAC system (blower motor, heater core, A/C compressor, refrigerant types and capacities, control panel), body panel removal and installation, door mechanisms, window regulators, interior trim components, exterior body panel repair and alignment, glass replacement.

Body And Chassis Repair:

Procedures for removing and reinstalling body panels, doors, fenders, bumpers, and interior trim. Includes information on chassis alignment, rust prevention, and basic bodywork repairs.

Maintenance Procedures:

Scheduled maintenance intervals, oil changes, filter replacements (oil, air, fuel), spark plug replacement, coolant flushes, brake fluid changes, tire rotation and pressure checks, belt inspections and replacement, battery maintenance.

Repair Procedures:

Engine rebuilds (rotary specific), transmission overhaul, clutch replacement, brake caliper and master cylinder replacement, suspension component replacement, steering rack rebuild, exhaust system repair, electrical component diagnosis and replacement, HVAC system repair, body panel repair and refinishing.

Troubleshooting:

Diagnostic flowcharts for common drivability issues, electrical system faults, cooling system problems, starting and charging issues, transmission performance problems, brake system malfunctions, HVAC system inefficiencies.

Engine Rebuild Detail:

Detailed, step-by-step procedures for complete rotary engine disassembly, inspection of critical components like apex seals, side seals, oil seals, and rotor housing surfaces, as well as reassembly with precise torque specifications and clearances. Includes specific instructions for oil seal installation and lubrication.

Diagnostic Capabilities:

Detailed diagnostic procedures, voltage and resistance specifications for electrical components, pressure testing for fuel and cooling systems, vacuum testing, timing specifications, component testing using multimeter and specialized tools.

Rebuild Instructions:

Comprehensive step-by-step instructions for complete engine disassembly, cleaning, inspection of critical wear components (seals, housings), reassembly with torque specifications, balancing, and break-in procedures. Transmission and differential rebuilds also covered in detail.

Wiring Diagrams:

Comprehensive, color-coded electrical wiring diagrams for all vehicle systems, including engine control, lighting, accessories, and instrumentation, aiding in complex electrical troubleshooting.

📊 Manual Specifications

File Format Details:

High-resolution PDF, searchable text for easy navigation, printable pages, bookmarked chapters for quick access.

Print Quality:

Clear, legible text and diagrams, accurate reproduction of original factory illustrations and schematics.

Binding Type:

Not Applicable (Digital Format)

Paper Type:

Not Applicable (Digital Format)

Manual Completeness:

This is a complete factory service manual, covering all aspects of vehicle repair and maintenance. It is not a condensed guide or owner's manual.

⚙️ Engine Specifications

Engine Type:

Naturally Aspirated Rotary (Wankel)

Engine Code:

12A

Rotor Displacement:

1.1 L (1146 cc) per rotor, total displacement 2.2 L (2292 cc) equivalent

Horsepower:

Approx. 135 hp @ 7000 rpm (US-spec, fuel-injected models)

Torque:

Approx. 133 lb-ft @ 3500 rpm

Compression Ratio:

9.4:1 (Rotary equivalent)

Fuel Delivery:

Electronic Fuel Injection (EFI) - typically Bosch L-Jetronic or similar.

Fuel Type:

Unleaded Gasoline (87 octane or higher recommended)

Apex Seals:

Critical wear item; manual details inspection, replacement, and lubrication procedures.

Oil Metering Pump:

Injects oil into the combustion chamber for apex seal lubrication; manual covers its operation and adjustment.

Rotary Specific Lubrication:

Details the separate lubrication system for apex and side seals, including the oil metering pump operation, adjustment, and potential failure points. Crucial for rotary engine longevity.

🔧 Transmission

Standard Transmission:

5-speed manual transmission

Optional Transmission:

4-speed automatic transmission (less common)

Transmission Fluid:

Manual: SAE 75W-90 or 80W-90 API GL-5 gear oil. Automatic: ATF Dexron II or equivalent.

Clutch Type:

Dry, single-plate, diaphragm spring type.

📐 Dimensions

Wheelbase:

Approx. 95.2 inches (2418 mm)

Length:

Approx. 167.5 inches (4255 mm)

Width:

Approx. 65.4 inches (1661 mm)

Height:

Approx. 49.4 inches (1255 mm)

Curb Weight:

Approx. 2600-2800 lbs (1180-1270 kg) depending on trim and options

Gross Vehicle Weight Rating:

Approx. 3500 lbs (1588 kg)

Trunk Capacity:

Limited, designed for sports car practicality

🛡️ Safety Features

Safety Ratings:

No official NHTSA/IIHS ratings available for this era. Rollover protection was a consideration with targa tops.

Active Safety:

Four-wheel disc brakes (standard on most models), rear-wheel drive, balanced chassis.

Passive Safety:

Seat belts (three-point inertial reel), padded dashboard and steering wheel, impact-absorbing steering column, reinforced door beams.

💡 Technology Features

Infotainment System:

Basic AM/FM radio with cassette player, optional graphic equalizer.

Driver Assistance Features:

Limited to the inherent handling characteristics and driver feedback provided by the chassis and suspension.

Connectivity Features:

None.

🔧 Maintenance

Oil Change Interval:

Every 3,000 miles or 3 months, whichever comes first. Rotary engines consume oil as part of normal operation.

Spark Plug Replacement Interval:

Refer to manual, typically around 20,000-30,000 miles, depending on plug type.

Coolant Change Interval:

Every 2 years or 30,000 miles.

Engine Oil Type:

API SG/SH, SAE 10W-30 or 10W-40 is commonly recommended. Rotary engines require a specific type of oil that can withstand higher temperatures and is injected into the combustion chamber.

Brake Fluid Type:

DOT 3 or DOT 4

Coolant Type:

Ethylene Glycol based antifreeze (50/50 mix with distilled water)

Differential Fluid Type:

SAE 80W-90 API GL-5 gear oil.

Known Issues:

Apex seal wear is the most common and significant issue. Overheating due to clogged coolant passages or inefficient cooling system. Hard starting when engine is warm (common rotary characteristic). Carburetor (on earlier models) or fuel injection system issues. Oil seal wear leading to excessive oil consumption.

Preventative Maintenance:

Regular oil level checks and top-offs (critical for rotary engines), diligent cooling system maintenance, proper engine warm-up and cool-down procedures, and timely apex seal replacements are crucial for longevity.

📚 Vehicle History

Brand Heritage:

Mazda has a long history of innovation, notably with its development and popularization of the Wankel rotary engine. The RX series cemented Mazda's reputation for sporty, driver-oriented vehicles.

Model Evolution:

The 1985 RX-7 is part of the second generation (FB), which ran from 1978 to 1985 (with styling updates). It succeeded the SA/FB generation and was later replaced by the FC generation (1986-1992).

Production Years:

1978-1985 (FB generation)

Manufacturing Location:

Japan

🏆 Awards & Recognition

Recognitions:

Consistently praised by automotive press for its handling, styling, and unique rotary engine. Frequently appeared on 'Best Sports Car' lists of its era.