🏷️ Basic Information Identification Make: Mercedes-Benz Model: 350 SD Turbo Year: 1991 Codes Chassis Code: W140 Engine Code: OM603.970 👋 Introduction Market Position Segment: Full-size Luxury Sedan (S-Class) Target Audience: Owners seeking to perform DIY maintenance and repairs, independent repair shops, automotive technicians. Competitive Analysis Competitors 1991: BMW 7 Series (E32), Lexus LS 400 (XF10), Cadillac DeVille Key Features Vehicle Features: Emphasis on luxury, comfort, advanced technology for its era, robust build quality, and powerful yet efficient diesel engine. Manual Value Proposition Cost Savings: Significant savings on dealership labor costs for maintenance and repairs. Knowledge Acquisition: Empowers owners with in-depth knowledge of their vehicle's systems and repair procedures. 📋 Manual Details Coverage Areas Primary Coverage: Full Service, Repair, Diagnostics, Electrical, Powertrain, Chassis Secondary Coverage: Maintenance, Troubleshooting, Component Replacement, Bodywork Page Count Estimated Pages: 1000+ Manual Type Type: Workshop Manual (WSM) / Service Repair Manual Language Language: English Format Format: Digital Download (PDF expected) File Format File Type: Likely PDF, potentially with searchable text and vector graphics for diagrams. Print Quality Quality: Professional quality, designed for clear reproduction of diagrams and text. Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) 📖 Manual Coverage Systems Covered Engine: OM603.970 3.5L Inline-6 Turbo Diesel, fuel injection, lubrication, cooling, exhaust Transmission: 4-speed Automatic Transmission (722.3/722.4 series), gear shifts, hydraulics, torque converter Drivetrain: Rear-Wheel Drive (RWD), differential, driveshafts, axle assembly Suspension: Independent front and rear suspension, springs, shock absorbers, control arms, anti-roll bars Brakes: Hydraulic disc brakes (front and rear), ABS (Anti-lock Braking System), parking brake Steering: Hydraulic power steering system, steering column, steering gear Electrical System: Battery, alternator, starter, lighting, ignition, wiring diagrams, fuses, relays, power windows, seats Climate Control: Automatic Climate Control (ACC), HVAC system, A/C compressor, refrigerant, heating core, blower motor Body And Chassis: Body structure, doors, hood, trunk, glass, interior trim, sound deadening Procedures Included Maintenance: Oil changes, filter replacements, fluid checks and top-offs, belt inspections and replacement, spark plug replacement (if applicable, though diesel) Engine Repair: Engine overhaul, cylinder head service, piston and ring replacement, crankshaft and bearing service, turbocharger diagnostics and repair Transmission Repair: Transmission fluid and filter changes, seal replacement, valve body diagnostics, clutch pack service (for automatic) Brake Repair: Brake pad and rotor replacement, brake caliper service, brake fluid flush and bleed, ABS system diagnosis and repair Electrical Troubleshooting: Wiring harness inspection, component testing, fault code retrieval and interpretation (OBD-I related), diagnostic procedures Suspension And Steering Repair: Alignment procedures, component replacement (bushings, ball joints, tie rods), power steering system repair Diagnostics: System-specific troubleshooting guides, common fault diagnosis, diagnostic tool usage (where applicable) Technical Depth Depth: Comprehensive: Covers routine maintenance, detailed component removal/installation, troubleshooting, and system overhauls. Diagnostic Level: Advanced diagnostic procedures, including interpretation of symptoms and fault codes. Repair Level: Full repair and rebuild procedures for major and minor components. ⚙️ Engine Specifications Primary Engine Engine Type: OM603.970 Inline 6-Cylinder Diesel with Turbocharger Displacement: 3.5 Liters (3449 cc) Bore X Stroke: 91.0 mm x 88.3 mm Compression Ratio: 22.0:1 Performance Horsepower Net: 134 hp @ 4000 rpm Torque Net: 239 lb-ft @ 2400 rpm Fuel System Fuel Injection: Bosch VE Rotary Injection Pump (Mechanical) Fuel Type: Diesel Fuel Cooling System Cooling Type: Liquid-Cooled, Pressurized System Lubrication System Oil Capacity: 7.5 Liters (8.0 US Quarts) Oil Filter Part Number: M-B: 000 180 26 09 (Typical, confirm specific) Turbocharger Turbo Model: Garrett (Specific model may vary, consult manual) 🔧 Transmission Standard Transmission Type: 4-Speed Automatic Transmission Transmission Model Code: 722.3XX or 722.4XX series (confirm specific) Optional Optional Transmission: None offered for 350 SD Turbo in this market. Features Transmission Fluid Type: MB 236.6 Specification Automatic Transmission Fluid (ATF) Transmission Fluid Capacity: Approx. 8.0 Liters (17.0 US Pints) for a complete fill (consult manual for exact capacity). Transmission Filter Part Number: M-B: 140 277 00 95 (Typical, confirm specific) 📐 Dimensions Exterior Length: approx. 5113 mm (199.5 in) Width: approx. 1886 mm (74.3 in) Height: approx. 1447 mm (57.0 in) Wheelbase: approx. 3040 mm (119.7 in) Weights Curb Weight: approx. 1860 kg (4100 lbs) Gross Vehicle Weight Rating Gvwr: Consult vehicle plate, typically around 2400 kg (5291 lbs) Cargo Trunk Volume: approx. 500 Liters (17.7 cu ft) 🛡️ Safety Features Ratings NHTSA Ratings 1991: Not directly available for 1991 models in the format of modern ratings. Known for robust build. Active Features ABS: Standard Anti-lock Braking System (ABS) Traction Control: Optional Acceleration Slip Regulation (ASR) may have been available on some models. Passive Features Airbags: Driver's airbag standard, passenger airbag optional or standard depending on market/trim. Seatbelts: Front and rear seat belts with pretensioners. Body Structure: High-strength steel body structure with crumple zones. 💡 Technology Features Infotainment Audio System: Factory premium audio system with AM/FM radio, cassette player. CD changer may be optional. Navigation: Optional early GPS navigation system (very basic by modern standards). Driver Assistance Cruise...