🏷️ Basic Information Identification Make: BMW Model: 635CSi Chassis Code: E24 Codes Engine Code Primary: M30B34 👋 Introduction Market Position Segment: Luxury Grand Tourer (GT) Competitive Analysis Competitors: Porsche 944, Mercedes-Benz SEC, Jaguar XJ-S Key Features Vehicle Attributes: Elegant styling, powerful inline-six engine, comfortable ride, sporty handling, rear-wheel drive Manual Value Proposition Benefit To Owner: Empowers owners and independent mechanics with the knowledge to maintain, diagnose, and repair the 635CSi effectively, preserving its classic status and performance. 📋 Manual Details Coverage Areas Years Covered: 1983, 1984, 1985, 1986, 1987, 1988, 1989 Page Count Estimated Pages: 1500+ Manual Type Type: Service Repair Workshop Manual Language Language: English Format Format: Digital (likely PDF) 📖 Manual Coverage Systems Covered Powertrain: Engine mechanicals, fuel system, ignition system, cooling system, exhaust system, lubrication system Drivetrain: Transmission (manual & automatic), driveshaft, differential, axles Chassis: Suspension (front & rear), steering system, braking system Electrical: Wiring diagrams, lighting, instrumentation, battery, alternator, starter, engine control unit (ECU) Body: Body panels, doors, windows, interior trim, HVAC system Procedures Included Maintenance: Oil change, filter replacement, tune-up procedures, fluid checks and changes Repair: Engine overhaul, transmission rebuild, brake system service, suspension component replacement, electrical component diagnosis and repair Troubleshooting: Diagnostic procedures for common and uncommon issues, fault code interpretation Diagnostics: Detailed diagnostic flowcharts and procedures for all major systems Technical Depth Depth: Comprehensive from basic maintenance to complete engine and transmission rebuilds, including electrical system diagnostics 📊 Manual Specifications File Format Digital Quality: High-resolution, searchable PDF with clear diagrams and text Print Quality Print Readability: Designed for clear printing of all pages, diagrams, and schematics Binding Type Physical Binding: N/A (assuming digital format) Paper Type Physical Paper: N/A (assuming digital format) ⚙️ Engine Specifications Primary Engine Engine Type: Naturally aspirated, SOHC inline-six Displacement: 3430 cc (3.4 Liters) Bore X Stroke: 92 mm x 86 mm Compression Ratio: 8.0:1 or 9.0:1 (depending on specific model year/market) Performance Horsepower Peak: 218 hp (163 kW) @ 5200 rpm (DIN) Torque Peak: 333 Nm (246 lb-ft) @ 3500 rpm (DIN) Fuel System Fuel Delivery: Bosch L-Jetronic (later Motronic) fuel injection Recommended Fuel: Premium Unleaded (91+ RON / 87+ AKI) Cooling System Coolant Type: BMW Blue Longlife Coolant or equivalent ethylene glycol-based coolant 🔧 Transmission Standard Type: 4-speed Getrag 265 manual transmission Optional Type: 3-speed ZF 4HP22 automatic transmission Features Manual Gear Ratios: Refer to manual for specific ratios (e.g., 3.72, 2.40, 1.44, 1.00) Automatic Features: Lock-up torque converter, sport mode (on some models) Fluid Specifications Manual Fluid: GL-4 Gear Oil, SAE 75W-90 or 80W-90 (check manual for specific BMW spec) Automatic Fluid: Dexron III or equivalent ATF 📐 Dimensions Exterior Length: 4750 mm (187.0 in) Width: 1755 mm (69.1 in) Height: 1380 mm (54.3 in) Wheelbase: 2774 mm (109.2 in) Weights Curb Weight: Approx. 1600-1700 kg (3527-3748 lbs) Gross Weight: Approx. 2100 kg (4630 lbs) Wheel Specifications Bolt Pattern: 5x120 Wheel Size: 16x7J or 16x7.5J (common option) Tire Size Standard Front: 205/55 VR 16 Standard Rear: 205/55 VR 16 or 225/50 VR 16 🛡️ Safety Features Ratings Crash Test Data: Limited official data available for this era; designed with robust safety cage and crumple zones. Active Features Braking System: Four-wheel disc brakes, ventilated front discs, ABS (Anti-lock Braking System) optional/standard on later models Passive Features Seat Belts: Three-point inertia-reel seatbelts (front), two-point lap belts (rear) Structure: Reinforced passenger cell, energy-absorbing steering column 💡 Technology Features Infotainment Audio System: Factory AM/FM stereo with cassette player, optional premium sound systems (e.g., Blaupunkt, Nakamichi on some models) Driver Assistance ABS: Available as an option on early models, standard on later versions. Connectivity Cruise Control: Standard feature Climate Control HVAC System: Manual or optional automatic climate control Comfort Features Seats: Power adjustable front seats with memory (optional), lumbar support 🔧 Maintenance Service Intervals Oil Change: Every 5,000-7,500 miles or 6-12 months, whichever comes first Major Service: At 30,000, 60,000, 90,000 miles (includes spark plugs, fuel filter, air filter, coolant check/flush) Fluid Specifications Engine Oil: 10W-40 or 20W-50 (API SG or higher), capacity 5.7 Liters (with filter) Coolant Capacity: Approx. 10.5 Liters Brake Fluid: DOT 4 Known Issues Common Wear Items: Suspension bushings (control arms, sway bars), fuel injectors, fuel pump, radiator, water pump, flex discs (driveshaft) Electrical Quirks: Headlight relays, door lock actuators, dashboard illumination, window regulators Engine Specific: Head gasket leaks (less common on M30 but possible), valve stem seals, timing chain guides (though robust) Part Numbers Oil Filter Example: Mann-Filter W 107, Bosch 0 451 104 001 (verify specific fitment with BMW P/N) Air Filter Example: Mann-Filter C 2561 (verify specific fitment with BMW P/N) 📚 Vehicle History Brand Heritage Bmw Philosophy: Building driver-focused, performance-oriented luxury vehicles with advanced engineering. Model Evolution E24 Generation: Produced from 1976 to 1989, the E24 coupe represented BMW's flagship luxury GT. The 635CSi, introduced in 1978, became the definitive performance model within...