Positioning:
The Porsche 924 was Porsche's entry-level sports car, designed to broaden the brand's appeal and offer a more affordable alternative to models like the 911 and 944. It was positioned as a stylish and agile GT car.
Competitors:
Competed with cars like the Datsun 280Z, Mazda RX-7, Toyota Celica Supra, and various European coupes from BMW and Alfa Romeo.
Design:
Transaxle layout (engine front, transmission rear) for balanced weight distribution, distinctive front-engine, rear-wheel-drive configuration, hatchback body style.
Engine Variant Significance:
Initial models featured a Volkswagen-derived 2.0L engine, later enhanced by the introduction of the 924 Turbo (931) with a more potent engine and improved chassis.
Value Proposition:
Essential for owners and mechanics maintaining or restoring the Porsche 924. Provides detailed technical guidance essential for preserving its performance and originality.
Engine Mechanical:
Detailed overhaul procedures for all 924 engine variants (2.0L I4, 2.5L I4 Turbo).
Fuel System:
Carburetor and fuel injection systems (CIS - Continuous Injection System), fuel pumps, lines, and tanks.
Ignition System:
Distributor, ignition coils, spark plug wires, timing specifications.
Cooling System:
Radiator, fan, thermostat, water pump, coolant types and capacities.
Exhaust System:
Exhaust manifold, catalytic converter (where applicable), muffler, pipe replacement.
Transmission Manual:
Overhaul and repair of manual gearboxes (4-speed, 5-speed), clutch replacement.
Transmission Automatic:
Service and repair of automatic transmission (e.g., VW's 090/091 transmissions).
Drivetrain:
Driveshafts, CV joints, transaxle unit.
Suspension Front:
MacPherson struts, control arms, ball joints, bushings, alignment specifications.
Suspension Rear:
Torsion bars, trailing arms, shock absorbers, bushings, alignment specifications.
Steering System:
Steering rack, tie rods, power steering system (if equipped).
Brakes Front:
Disc brake caliper overhaul, pad replacement, rotor specifications.
Brakes Rear:
Disc brake caliper overhaul, pad replacement, rotor specifications.
Parking Brake:
Adjustment and repair of the parking brake mechanism.
Electrical System Charging:
Alternator, voltage regulator, battery maintenance.
Electrical System Starting:
Starter motor, ignition switch.
Lighting System:
Headlights, taillights, interior lighting, bulb specifications.
Gauges And Instruments:
Speedometer, tachometer, fuel gauge, warning lights, instrument cluster repair.
Wiper And Washer System:
Wiper motor, linkage, washer pump and nozzles.
HVAC System:
Heater core, ventilation system, A/C system (if equipped).
Bodywork And Chassis:
Panel alignment, door mechanisms, lock systems, glass replacement.
Interior Trim:
Seat removal and repair, dashboard disassembly, carpet replacement.
Scheduled Maintenance:
Detailed maintenance schedules for oil changes, filter replacements, fluid checks, spark plugs, timing belts.
Troubleshooting:
Diagnostic procedures for common problems, symptom-based troubleshooting guides.
Engine Rebuild:
Step-by-step instructions for complete engine disassembly, inspection, and reassembly.
Transmission Overhaul:
Complete guides for manual and automatic transmission rebuilding.
Brake System Repair:
Brake pad, rotor, caliper, and line replacement and bleeding procedures.
Electrical Diagnostics:
Wiring diagrams, fuse box layouts, component testing procedures.
Suspension Component Replacement:
Detailed instructions for replacing control arms, ball joints, bushings, and struts.
Clutch Replacement:
Complete guide for clutch disc, pressure plate, and release bearing replacement.
Fuel System Cleaning:
Carburetor cleaning and adjustment, fuel injector testing and replacement.
Timing Belt Replacement:
Critical procedures for timing belt renewal to prevent catastrophic engine damage.
Wheel Alignment:
Specifications and procedures for front and rear wheel alignment.
Body Panel Repair:
Information on body panel removal, installation, and basic repair.
Depth Level:
Comprehensive; covers everything from basic fluid changes to full engine and transmission rebuilds.
Diagnostic Capabilities:
Advanced diagnostic procedures, including wiring diagrams and troubleshooting flowcharts.
Repair Scope:
Covers all major mechanical, electrical, and body systems of the Porsche 924.
Engine Code Base:
VW EA831
Engine Type Base:
Inline 4-cylinder, overhead camshaft (OHC)
Displacement Base:
1984 cc (2.0 Liters)
Bore X Stroke Base:
80.0 mm x 99.3 mm
Compression Ratio Base:
8.5:1 (typical for early models)
Horsepower Base:
110 hp (approx. at 5800 rpm) for early 2.0L
Torque Base:
127 lb-ft (approx. at 3400 rpm) for early 2.0L
Engine Code Turbo:
M31 (924 Turbo)
Engine Type Turbo:
Inline 4-cylinder, OHC, turbocharged
Displacement Turbo:
2.0 Liters
Horsepower Turbo:
143 hp (approx. at 5500 rpm) for 924 Turbo (M31)
Torque Turbo:
164 lb-ft (approx. at 3500 rpm) for 924 Turbo (M31)
Carburetor Type:
Solex 32/35/32 DIDTA or Zenith 35/35 INAT (depending on market and year)
Injection System:
Bosch K-Jetronic (CIS) on later models and 924 S.
Fuel Grade:
Unleaded gasoline, typically 91-octane or higher recommended.
Oil Change Interval:
Typically every 7,500-10,000 miles (12,000-15,000 km) or annually, whichever comes first. Consult specific manual for exact intervals.
Timing Belt Replacement:
Crucial interval, often around 60,000 miles (96,000 km) or 4-5 years for the 2.0L OHC engine. The manual will provide the exact interval and procedure.
Spark Plug Replacement:
Every 20,000-30,000 miles (32,000-48,000 km), depending on plug type.
Engine Oil Type:
API SF or SG, SAE 10W-40 or 15W-50 recommended for most conditions. Check manual for precise recommendations.
Coolant Type:
Ethylene glycol-based coolant, typically a 50/50 mix with distilled water. Porsche recommends specific coolants; consult manual.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid. Replace every 2 years or as recommended.
Transmission Fluid Manual:
GL-4 SAE 75W-90 or 80W-90 gear oil. Capacity approx. 2.5 liters. Manual will specify precise type.
Transmission Fluid Automatic:
Dexron II or equivalent automatic transmission fluid. Capacity approx. 3.5 liters. Manual will specify precise type.
Power Steering Fluid:
ATF (Automatic Transmission Fluid) or specific power steering fluid. Check manual.
Engine Problems:
Timing belt tensioner failure, oil leaks from rear main seal and valve cover gasket, carburetor issues (clogging, adjustment), fuel distributor issues (CIS).
Suspension Problems:
Worn control arm bushings, worn ball joints, leaky struts, rear torsion bar sagging.
Electrical Problems:
Degradation of wiring insulation (especially in warmer climates), faulty headlight relays, instrument cluster intermittent failures.
Rust Susceptibility:
Common rust areas include wheel arches, sills, rear quarter panels, and around the windshield/rear window seals.