🏷️ Basic Information Identification Make: Mercedes-Benz Model: 350 SD Turbo Model Code: W140.135 Year: 1991 👋 Introduction Market Position Market Segment: Luxury Full-Size Sedan Target Audience: Affluent individuals seeking comfort, performance, and advanced engineering. Competitive Analysis Key Competitors: BMW 7 Series (E32), Lexus LS 400 (UCF10), Cadillac Sedan DeVille. Key Features Brand Heritage: Reputation for robust engineering, luxury appointments, and pioneering automotive technology. Model Characteristics: Exceptional build quality, refined ride, powerful yet economical diesel engine, advanced (for its time) features. Manual Value Proposition Value: Essential resource for owners and independent mechanics to maintain and repair the sophisticated W140 chassis, ensuring longevity and optimal performance. 📋 Manual Details Coverage Areas Engine Coverage: OM603.971 Diesel Turbocharged 3.5L Inline-6 Transmission Coverage: 4-Speed Automatic Transmission (722.3xx series) Chassis Coverage: Suspension, Steering, Brakes, Body Electrical Coverage: Wiring Diagrams, ECUs, Lighting, Accessories Page Count Estimated Page Count: Approximately 1500-2000 pages (typical for comprehensive workshop manuals of this era) Manual Type Type: Workshop Service and Repair Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Engine removal/installation, cylinder head, pistons, crankshaft, camshaft, timing system, oil system, cooling system, fuel injection system (Bosch VE), Engine Performance: Turbocharger system, intercooler, emissions control system, diagnostic procedures for engine performance. Transmission Manual: Automatic transmission removal/installation, internal components, torque converter, hydraulic system, electronic control unit (ECT). Drivetrain: Driveshafts, differential, axles. Suspension Front: Independent front suspension, shock absorbers, springs, control arms, anti-roll bar. Steering: Power steering system, steering gear, steering column, steering wheel. Brakes Front: Vented disc brakes, calipers, brake pads, rotors. Brake Control: Anti-lock Braking System (ABS) components and diagnostics. Body Exterior: Body panels, doors, hood, trunk, bumpers, glass, seals. HVAC: Heating, Ventilation, and Air Conditioning (HVAC) system components, refrigerant, controls. Electrical Lighting: Headlights, taillights, interior lighting, fog lights. Electrical Accessories: Power windows, power locks, power mirrors, sunroof, cruise control, central locking system. Electrical Audio: Radio, speakers, antenna. Electrical ECU: Engine Control Unit (ECU) and transmission control unit (TCU) diagnostics and component identification. Wiring Diagrams: Comprehensive electrical schematics and wiring diagrams for all vehicle systems. Suspension Rear Suspension Rear: Independent rear suspension, multi-link setup, shock absorbers, springs, anti-roll bar. Brakes Rear Brakes Rear: Disc brakes, calipers, brake pads, rotors. Body Interior Body Interior: Interior trim, seats, dashboard, headliner, carpeting. Electrical Instruments Electrical Instruments: Instrument cluster, gauges, warning lamps. Procedures Included Routine Maintenance: Oil and filter changes, air filter replacement, fuel filter replacement, coolant flush, spark plug replacement (if applicable), belt inspection/replacement. Troubleshooting: Diagnostic procedures for common issues, fault code interpretation, symptom-based troubleshooting guides. Engine Repair: Complete engine overhaul procedures, including disassembly, inspection, measurement, and reassembly of internal components. Transmission Repair: Automatic transmission repair and overhaul, including clutch pack replacement, valve body servicing, and seal replacement. Brake System Repair: Brake pad and rotor replacement, caliper servicing, brake line replacement, bleeding procedures, ABS system component replacement. Suspension Steering Repair: Replacement of control arms, ball joints, tie rod ends, shock absorbers, springs, steering gear. Electrical Diagnostics: Diagnosis and repair of electrical faults, testing of sensors, actuators, and control modules. Bodywork Repair: Procedures for body panel removal/installation, collision repair guidance, glass replacement. HVAC Repair: Diagnosis and repair of HVAC system faults, refrigerant system servicing, component replacement. Torque Specifications: Detailed torque specifications for all critical fasteners. Technical Depth Depth: Comprehensive from basic maintenance to complete engine and transmission rebuilds, including advanced diagnostics and electrical troubleshooting. 📊 Manual Specifications File Format PDF Quality: High-resolution, searchable text and clear images. Printable: Printable pages Binding Type Binding: N/A (Digital PDF) Paper Type Paper: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Code: OM603.971 Engine Type: Inline-6 Cylinder, Overhead Camshaft (OHC), Diesel Displacement: 3.5 Liters (3449 cc) Aspiration: Turbocharged with Intercooler Performance Horsepower: 148 hp @ 4000 rpm (approx.) Torque: 255 lb-ft @ 2400 rpm (approx.) Fuel System Fuel Type: Diesel Fuel Injection System: Bosch VE Rotary Injection Pump, Indirect Injection Cooling System Cooling Type: Liquid-Cooled Lubrication System Oil Capacity: 8.0 Liters (with filter) Maintenance Recommended Oil: API CD or CE, SAE 15W-40 or 10W-40 (refer to manual for exact specifications based on climate). 🔧 Transmission Standard Transmission Type: 4-Speed Automatic Transmission Model Code: 722.3xx series (e.g., 722.371) Optional Transmission Type: Not applicable for this specific model variant Features Electronic Control: Electronically Controlled Transmission (ECT) for optimized shift points and economy. Maintenance Transmission Fluid Type: MB 236.6 (Shell Donax TX or equivalent) Fluid Capacity: Approximately 8.0 Liters (for complete drain and fill, including torque converter) 📐 Dimensions Exterior Length: 5163 mm (203.3 in) Width: 1886 mm (74.3 in) Height: 1487 mm (58.5 in) Wheelbase: 3040 mm (119.7 in) Weights Curb Weight: Approx. 1900 kg (4189 lbs) Gross Vehicle Weight Rating: Approx. 2470 kg (5445 lbs) Cargo Trunk Volume: Approx. 520 Liters (18.4 cu ft) 🛡️ Safety Features Ratings Crash Test Results: Information for this specific year and model is limited in readily available public...