🏷️ Basic Information Identification Make: BMW Model: 6 Series (E24) Variant: 635CSi / M635CSi Generation Chassis Code: E24 Codes Engine Code 635Csi: M30B34 Engine Code M635Csi: S38B35 👋 Introduction Market Position Segment: Luxury Grand Tourer (GT) Coupe Era Competitors: Jaguar XJ-S, Mercedes-Benz SEC-Class (W126), Porsche 944 Competitive Analysis Unique Selling Points: BMW's characteristic inline-six engine, superior handling dynamics, driver-focused cockpit, build quality, and performance-oriented M variant. Key Features Design Philosophy: Elegance, performance, and driver engagement blended into a sophisticated coupe body style. Target Audience: Affluent individuals seeking a stylish, powerful, and engaging driving experience with German engineering heritage. 📋 Manual Details Coverage Areas Applicable Years: 1983, 1984, 1985, 1986, 1987, 1988, 1989 Page Count Total Pages: 871 Manual Type Type: Workshop Service Repair Manual Language Language: English Format Format: PDF (Digital Download) 📖 Manual Coverage Systems Covered Engine Mechanical: Full overhaul, diagnosis, timing, cooling system, lubrication, fuel delivery (mechanical injection/early EFI), exhaust Engine Management: Digifant/Motronic (early variants), ignition system, sensors, actuators, diagnostic trouble codes (DTCs) where applicable for the era Transmission Manual: Clutch, gearbox overhaul, component replacement, shift mechanism Transmission Automatic: ZF 4HP22, torque converter, valve body, hydraulic circuits, service procedures Suspension: Front MacPherson struts, rear trailing arms, shock absorbers, springs, bushings, alignment specifications Brakes: Front and rear disc brakes (vented front), ABS (Anti-lock Braking System) diagnosis and repair, hydraulic system, parking brake Steering: Power steering system, steering rack, steering column, tie rods, alignment Electrical System: Wiring diagrams, battery, alternator, starter, lighting, horns, power windows, mirrors, central locking, fuse box Body And Chassis: Body panel removal/installation, interior trim, bumpers, glass, rust prevention, jacking points HVAC: Heating, ventilation, air conditioning system (if equipped), refrigerant handling (R12 era) Procedures Included Routine Maintenance: Oil changes, filter replacements, spark plug replacement, fluid checks and top-offs Troubleshooting: Systematic diagnostic procedures, symptom-based fault finding, common problem diagnosis Major Repairs: Engine rebuilds, transmission overhauls, suspension component replacement, brake caliper rebuilding Component Removal Installation: Detailed instructions for removing and refitting all major mechanical and electrical components Special Tools: Identification and usage of specialized BMW tools required for specific repair procedures Technical Depth Depth: Comprehensive; covers everything from basic maintenance to full engine and transmission rebuilds. Suitable for professional mechanics and skilled DIY enthusiasts. 📊 Manual Specifications File Format File Type: PDF Print Quality Quality: High-resolution scans of original factory documentation, ensuring clarity of text and diagrams. Binding Type Binding: N/A (Digital PDF) Paper Type Paper: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine 635Csi Type: Naturally Aspirated Inline 6-Cylinder, SOHC Displacement: 3.4 Liters (3430 cc) Bore X Stroke: 92 mm x 86 mm Compression Ratio: 8.0:1 (approx.) Horsepower: 218 PS (215 hp) @ 5,200 RPM (Euro Spec) Torque: 304 Nm (224 lb-ft) @ 3,000 RPM (Euro Spec) Primary Engine M635Csi Type: Naturally Aspirated Inline 6-Cylinder, DOHC (M Power) Displacement: 3.5 Liters (3453 cc) Bore X Stroke: 93.4 mm x 84 mm Compression Ratio: 10.5:1 Horsepower: 286 PS (282 hp) @ 6,500 RPM (Euro Spec) Torque: 333 Nm (246 lb-ft) @ 5,000 RPM (Euro Spec) Performance 0 60 Mph 635Csi Auto: 7.6 seconds (approx.) 0 60 Mph M635Csi Manual: 6.5 seconds (approx.) Fuel System 635Csi: Bosch L-Jetronic Fuel Injection (early models) / Motronic EFI (later models) M635Csi: Bosch Motronic EFI Fuel Type Recommended: Premium Unleaded Gasoline (91+ Octane) 🔧 Transmission Standard 635Csi Type: 4-Speed Manual Getrag 265 Optional 635Csi Type: 3-Speed Automatic ZF 4HP22 Standard M635Csi Type: 5-Speed Manual Getrag 280 (dogleg first gear) Features Limited Slip Differential: Optional on 635CSi, standard on M635CSi Fluid Specifications Manual Gearbox Fluid: GL-4 Gear Oil (e.g., Castrol EPX 80W-90, 75W-90) Automatic Gearbox Fluid: ATF Dexron III or equivalent 📐 Dimensions Exterior Length Overall: 4,755 mm (187.2 in) Exterior Width Overall: 1,725 mm (67.9 in) Exterior Height Overall: 1,370 mm (53.9 in) Wheelbase Front Rear: 2,775 mm (109.3 in) Weights Curb Weight 635Csi Auto: 1,500 kg (3,307 lbs) Curb Weight M635Csi Manual: 1,570 kg (3,461 lbs) Wheels And Tires Wheel Bolt Pattern: 5 x 120 mm Tire Size Standard 635Csi: 205/70VR14 or 220/55VR390 Tire Size Standard M635Csi: 225/50VR16 (front), 245/45VR16 (rear) 🛡️ Safety Features Ratings Era Safety Standards: Reflects early 1980s safety design; equipped with safety features standard for the period. Active Features ABS: Available and optional on later models, standard on some M variants. Requires specific diagnostic procedures. Limited Slip Differential: Enhances traction and stability under acceleration. Passive Features Seatbelts: Three-point inertia reel seatbelts Structure: Reinforced safety cage, crumple zones, side impact protection beams. Headrests: Adjustable front and rear headrests 💡 Technology Features Infotainment Audio System: Factory fitted BMW Bavaria cassette/radio systems. Some may have been upgraded over the years. Driver Assistance Cruise Control: Standard on most models, vacuum or electronically controlled. Connectivity Era Features: Basic by modern standards, focused on mechanical and driver control. No integrated Bluetooth or advanced telematics. 🔧 Maintenance Service Intervals Oil Change: Every 10,000-15,000 km (6,000-10,000 miles)...