🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 Product Name: Mercedes-Benz W126 Service Repair Manual Codes Chassis Code: W126 👋 Introduction Market Position Segment: Full-size Luxury Sedan/Coupe Target Audience: Affluent consumers seeking comfort, safety, and prestige. Competitive Analysis Key Competitors: BMW 7 Series, Audi V8, Cadillac DeVille, Lincoln Town Car. Key Features Design Philosophy: Elegance, refinement, advanced engineering, and superior build quality characteristic of Mercedes-Benz. Innovations: Early adoption of SRS airbags, ABS, and advanced safety features for its era. 📋 Manual Details Coverage Areas Coverage Scope: Comprehensive workshop repair and service procedures Page Count Estimated Page Count: Varies by specific model/year subset, but typically 2000+ pages for a complete set. Manual Type Type: Workshop Service Manual / Repair Manual Language Language: English (Primary), often available in German, French, etc. depending on original factory source. Format Format: PDF (as described in product information) 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, disassembly, overhaul, tuning, lubrication, cooling system, fuel system (carburetor & fuel injection). Engine Management: Engine control units (ECU), ignition systems, emissions control systems, sensor diagnostics. Transmission Manual: Manual gearbox operation, overhaul, clutch system, driveshafts, rear axle. Transmission Automatic: Automatic transmission (e.g., 722.3, 722.4, 722.5) operation, overhaul, hydraulic systems, torque converter. Brakes: Hydraulic system, ABS (Anti-lock Braking System) components and diagnostics, brake pad/disc replacement, caliper overhaul, parking brake. Suspension: Front and rear suspension components, shock absorbers, springs, bushings, alignment specifications, self-leveling suspension (if equipped). Steering: Power steering system, steering gear, linkages, steering column, steering wheel. Electrical System: Battery, charging system (alternator), starter motor, lighting systems (headlamps, taillamps, interior), instrumentation, wiring diagrams. Body And Chassis: Body panels, doors, hood, trunk, glass, interior trim, chassis frame, rust prevention, body repairs. HVAC: Heating, ventilation, and air conditioning (HVAC) system, climate control, refrigerant handling, blower motor, compressor. Fuel System: Fuel tank, fuel pump, fuel lines, fuel injectors (for fuel-injected models), fuel filters. Exhaust System: Exhaust manifold, catalytic converter, muffler, exhaust pipes, oxygen sensors. Wheels And Tires: Wheel specifications, tire sizes, pressure recommendations, mounting procedures. Procedures Included Preventative Maintenance: Scheduled maintenance tasks, lubrication points, fluid changes, filter replacements. Troubleshooting: Diagnostic procedures for common problems, fault finding charts, symptom-based troubleshooting. Repair And Overhaul: Step-by-step instructions for component removal, disassembly, repair, assembly, and installation. Engine Overhaul: Complete engine rebuild procedures, including piston rings, bearings, valve seats, camshafts. Transmission Rebuild: Detailed steps for rebuilding both manual and automatic transmissions. Brake System Repair: Bleeding procedures, caliper replacement, master cylinder overhaul, ABS module diagnostics. Electrical Diagnostics: Testing circuits, diagnosing electrical faults, using multimeter and oscilloscopes, wiring harness repair. Body Repair: Panel replacement, dent repair, rust remediation, glass replacement. HVAC Service: Refrigerant recharging, leak detection, component replacement (compressor, evaporator, condenser). Technical Depth Depth: In-depth, professional-level coverage suitable for experienced technicians and serious DIY enthusiasts. Diagrams: Detailed step-by-step diagrams, exploded views, and troubleshooting flowcharts. Specifications: Includes torque specifications, clearances, timing marks, electrical resistance values, fluid capacities, and diagnostic data. 📊 Manual Specifications File Format File Type: PDF Print Quality Quality: High-resolution scans, enabling clear viewing and printing of text and diagrams. Binding Type Binding: N/A (Digital PDF format) Paper Type Paper Quality: N/A (Digital PDF format) ⚙️ Engine Specifications Primary Engine Engine Displacement Range: 2.8L (170 cu in) to 5.6L (340 cu in) - M103, M110, M116, M117 inline-6 and V8 engines. Performance Horsepower Range: Approx. 140 hp (2.8L) to 270 hp (5.6L) depending on variant and market. Torque Range: Approx. 200 Nm (148 lb-ft) to 450 Nm (332 lb-ft). Fuel System Injection Systems: Bosch K-Jetronic (CIS), KE-Jetronic (CIS-E), and later Electronic Fuel Injection (EFI) depending on model and year. Engine Code Examples Example Codes: M103.980 (3.0L I6), M117.962 (5.0L V8), M116.962 (3.8L V8). 🔧 Transmission Standard Standard Transmission: 4-speed automatic (e.g., 722.3) was most common. Manual transmissions were rare in most markets, often a 5-speed. Optional Optional Transmission: 5-speed manual transmission (e.g., G3/27) was available on some base models, notably in Europe. Later models offered a 4-speed automatic with electronic control (722.4) and a 5-speed automatic (722.5). Features Automatic Features: Lock-up torque converter, often offered with a sport/economy mode selector. 📐 Dimensions Exterior Wheelbase: 2,935 mm (115.6 in) Length: 4,965 mm (195.5 in) for Sedan, 5,010 mm (197.2 in) for SEL (long wheelbase) Width: 1,790 mm (70.5 in) Height: 1,420 mm (55.9 in) for Sedan, 1,412 mm (55.6 in) for SEL Weights Curb Weight Range: Approx. 1,600 kg (3,527 lbs) to 1,900 kg (4,189 lbs) 🛡️ Safety Features Ratings Crash Test Results: No standardized crash test ratings like modern NHTSA/Euro NCAP. However, known for robust construction and excellent passive safety for its era. Active Features ABS: Standard on most models from mid-production onwards. Anti-lock Braking System. Traction Control: Optional (ASR - Acceleration Slip Regulation) on later models, particularly V8 variants. Passive Features Airbags: Driver's SRS airbag became standard in 1985. Passenger airbag optional on later models. Seatbelts: Three-point inertia-reel seatbelts front...