🏷️ Basic Information Identification Make: BMW Model: 8 Series (E31) Model Variants: 840Ci, 850i, 850Ci, 850CSi Production Years: 1989-1996 Codes Chassis Code: E31 👋 Introduction Market Position Segment: Luxury Grand Tourer Target Audience: Owners and independent repair shops specializing in BMW vehicles of this era. Competitive Analysis Competitors: Mercedes-Benz SL-Class (R129), Jaguar XJS, Porsche 928. Key Features Design Philosophy: BMW's focus on advanced engineering, performance, and luxury for a flagship coupe. Manual Advantage: Provides comprehensive, factory-level repair and maintenance information essential for preserving these complex vehicles. 📋 Manual Details Coverage Areas Engine Overhaul Rebuild: Yes Brakes: Yes Sunroof: Yes Timing Belt Replacement: Yes Trouble Codes: Yes Wiring Diagrams: Yes Troubleshooting Diagnostics: Yes Computer Diagnostic Tree Charts: Yes Engine Performance: Yes Front End Alignment: Yes Suspension: Yes Transmission Removal Installation: Yes Air Conditioning Service Capacities: Yes Transmission In Car Servicing: Yes Computer Diagnostic Codes: Yes Firing Orders: Yes Detailed Specifications All Models: Yes Factory Maintenance Schedules Charts: Yes Serpentine Belt Routings Diagrams: Yes Timing Belt Service Procedures: Yes Brake Servicing Procedures: Yes Driving Concerns: Yes Complete Torque Specifications: Yes U Joint Cv Joint Service: Yes Repair Procedures: Yes Hundreds Of Illustrations: Yes Vacuum Diagrams: Yes Page Count Page Count: Not Specified (Comprehensive Coverage Implied) Manual Type Manual Type: Workshop Repair Service Manual Language Language: English Format File Format: PDF Digital Format Compatibility: All Versions of Windows, Mac, iOS, BB, Android Viewing Requirements: PDF Reader Printability: Yes (Printable Pages) 📖 Manual Coverage Systems Covered Engine Systems: V12 (M70, M73), V8 (M60) engine overhaul, rebuilding, performance tuning, timing belt/chain service, serpentine belt routing, firing orders, troubleshooting. Transmission Systems: Automatic transmission removal, installation, and in-car servicing. Comprehensive coverage for models equipped with the 5-speed automatic (e.g., 5HP30). Brake Systems: Detailed brake servicing procedures, including hydraulic system repairs, component replacement, bleeding procedures, and specifications. Suspension Steering: Front end alignment procedures and specifications, suspension component repair and replacement, shock absorber and spring servicing. Electrical Systems: Complete wiring diagrams for all vehicle systems, troubleshooting electrical faults, diagnostic trouble tree charts, and computer diagnostic codes. Climate Control: Air conditioning service, including refrigerant capacities, system checks, and repair procedures. Body Chassis: Sunroof repair and service, U-joint and CV-joint service procedures, general bodywork repair guidance. Procedures Included Diagnostic Troubleshooting: Extensive coverage of diagnostic procedures, troubleshooting common drivability issues, and interpreting diagnostic trouble codes. Maintenance Scheduling: Factory recommended maintenance schedules and charts for routine servicing and longevity. Component Replacement: Step-by-step instructions for the removal and installation of major components like engines, transmissions, and suspension parts. Torque Specifications: Complete torque specifications for critical fasteners throughout the vehicle for accurate assembly. Fluid Management: Guidance on fluid types, capacities, and change intervals for engine oil, transmission fluid, brake fluid, and coolant. Technical Depth Depth Of Coverage: Comprehensive A-Z coverage, from basic maintenance to complete engine and transmission overhauls. Illustration Quality: Detailed illustrations, exploded diagrams, drawings, and photos for clear procedural guidance. User Accessibility: Designed for both novice DIY mechanics and experienced technicians, with easy-to-follow step-by-step instructions. 📊 Manual Specifications File Format Digital Delivery: Instant Download Print Quality Print Capability: High quality, printable pages for workshop use. Binding Type Binding: Digital (PDF) - Printable Paper Type Paper Type: N/A (Digital Format) ⚙️ Engine Specifications Primary Engine 840Ci Engine: 4.0L V8 (M60B40) 850I 850Ci Engine: 5.0L V12 (M70B50) 850Csi Engine: 5.6L V12 (S70B56) Performance 840Ci Horsepower: ~282 hp @ 5800 rpm 840Ci Torque: ~400 Nm (295 lb-ft) @ 4500 rpm 850I 850Ci Horsepower: ~296 hp @ 5200 rpm 850I 850Ci Torque: ~470 Nm (347 lb-ft) @ 4100 rpm 850Csi Horsepower: ~375 hp @ 5300 rpm 850Csi Torque: ~550 Nm (406 lb-ft) @ 4100 rpm Fuel System Fuel Injection: Bosch Motronic Engine Management System (specific version varies by engine and year) 🔧 Transmission Standard 840Ci Transmission: 4-speed automatic (4HP-22) 850I 850Ci Transmission: 4-speed automatic (4HP-24 or 5HP-30) Optional 850I 850Ci Manual Transmission: 6-speed manual (S6S-2300/3100) available on select early 850i models. 850Csi Transmission: 6-speed manual (S6S-2300/3100) was standard. Features Transmission Control: Electronic transmission control with various shift modes (e.g., Sport/Comfort) on later models. 📐 Dimensions Exterior Wheelbase: ~2580 mm (101.6 in) Length: ~4780-4980 mm (188.2-196.1 in) depending on model and year Width: ~1850 mm (72.8 in) Height: ~1370 mm (53.9 in) Weights Curb Weight Range: ~1700-1950 kg (3748-4299 lbs) depending on engine and options 🛡️ Safety Features Ratings Safety Equipment: Standard safety features of the era, including ABS, airbags (driver and passenger on later models), crumple zones. Active Features Active Safety: Anti-lock Braking System (ABS), optional Traction Control System (ASC+T) on some models. Passive Features Passive Safety: Reinforced body structure, safety-belt pretensioners, energy-absorbing interior components. 💡 Technology Features Infotainment Infotainment System: Early models featured cassette players and analog radio. Later models offered optional CD changers and rudimentary navigation systems (e.g., BMW Professional Navigation). Driver Assistance Driver Assistance Features: ABS, Cruise Control. Traction control (ASC+T) was available on...