🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 SEC Model Year: 1985 Codes Chassis Code: W126 Body Style Code: C126 👋 Introduction Market Position Positioning: An essential resource for owners and independent repair shops seeking authentic, detailed information for the 1985 Mercedes-Benz W126 SEC. Competitive Analysis Advantage: Directly sourced from dealership technician materials, offering superior accuracy and completeness compared to generic aftermarket guides. Key Features Completeness: Covers all models and all repairs A-Z, providing an all-inclusive solution. Digital Convenience: Single PDF format allows for easy digital access, searching, and selective printing. Value Proposition Benefit: Empowers users to perform maintenance, diagnostics, and repairs themselves, saving time and money on mechanic fees. 📋 Manual Details Coverage Areas Primary Models Covered: 1985 Mercedes-Benz W126 SEC Coupe (all variants) Repair Scope: A-Z (all repairs) Manual Type Type: Factory Service and Repair Manual Language Language: English Format Format: PDF File Compatibility: Windows (Vista 32/64, XP, ME, 98, NT, 2000), Mac Page Count Page Count: Not specified, but described as comprehensive for A-Z repairs. 📖 Manual Coverage Systems Covered Engine: Complete engine service, overhaul, and diagnosis Control System: Engine control unit (ECU) and related systems Mechanical: Comprehensive mechanical component repair and adjustment Fuel System: Fuel delivery, injection, specifications, and service Emission Control: Emission system diagnosis and repair Cooling System: Cooling system maintenance, diagnosis, and repair Lubrication System: Lubrication system maintenance and specifications Ignition System: Ignition system diagnosis, repair, and specifications Charging System: Charging system diagnosis and repair Automatic Transmission: Automatic transmission service, repair, and specifications Manual Transmission: Manual transmission service, repair, and specifications (if applicable to specific SEC models) Drivetrain: Driveshaft, differential, axles, and suspension service Wheels Tires: Tire and wheel specifications, service, and alignment Brakes: Brake system service, repair, and specifications (including parking brake) Steering: Steering column and power steering system service and repair Climate Control: Air conditioning system service and repair Safety Systems: Supplemental restraint system (airbags), seat belts Security: Engine immobilizer (if applicable) Driver Convenience: Cruise control, windshield wipers and washers, door locks Interior Systems: Instrument panel, meters, audio/visual systems, seats, interior trim Exterior Body: Engine hood, doors, exterior and interior trim, glass and mirrors Electrical System: Complete electrical system diagnosis and repair Multiplex Communication: Multiplex/CAN communication systems (early forms) Procedures Included Maintenance: Routine maintenance, fluid checks, filter replacements, tune-ups Troubleshooting: Systematic diagnostic procedures for common and uncommon faults Repair: Step-by-step instructions for component repair and replacement Overhaul: Complete engine and transmission overhaul procedures Adjustment: Precise adjustments for engine timing, brakes, suspension, etc. Diagnostics: Detailed diagnostic trees and flowcharts for various systems Wiring: Complete and detailed wiring schematics for all electrical systems Engine Timing: Detailed procedures for setting and verifying ignition and valve timing. Fuel Injection Diagnosis: In-depth guides for diagnosing and adjusting K-Jetronic fuel injection system. Electrical Component Testing: Methods for testing alternators, starter motors, ignition coils, and electronic control modules. Suspension Alignment: Specifications and procedures for front and rear suspension alignment. Climate Control Diagnostics: Troubleshooting guide for the automatic climate control system (e.g., servo issues, refrigerant recharge). Technical Depth Depth: Factory level detailed information, suitable for professional technicians and advanced DIY enthusiasts. Diagrams Illustrations: Extensive diagrams, illustrations, and exploded views for clarity. Specifications: Comprehensive technical specifications for all components and systems. 📊 Manual Specifications File Format File Type: PDF Searchability: Likely text-searchable within the PDF for easy navigation. Print Quality Printability: All pages are printable, allowing users to print only necessary sections. Image Scaling: Ability to blow up images for enlarged printing. Binding Type Binding: Digital (PDF), eliminating physical binding concerns. Paper Type Paper Type: N/A (Digital format), but printable on any paper type. ⚙️ Engine Specifications Primary Engine Engine Type: Likely V8 (M116 or M117 engine variants for 1985 SEC models) Engine Displacement: Commonly 5.0 liters (e.g., 500 SEC) or 3.8 liters (e.g., 380 SEC, though 1985 may have been the transition year or specific markets). Fuel System: Bosch K-Jetronic (CIS) mechanical fuel injection system Performance Horsepower Torque: Specific figures vary by engine variant (e.g., 500 SEC ~230-240 hp), detailed in the manual. 🔧 Transmission Standard Type: Likely 4-speed automatic transmission (e.g., 722.3 or 722.4 series) Optional Type: Manual transmission was exceptionally rare to non-existent in SEC models during this era. Features Fluid Type: Specific ATF (Automatic Transmission Fluid) type required (e.g., Dexron II or equivalent), detailed in the manual. 📐 Dimensions Exterior Body Style: 2-door Coupe (C126) Weights Curb Weight: Approximately 3700-4000 lbs (1680-1815 kg), varies by engine and equipment. 🛡️ Safety Features Passive Features Airbags: Driver-side airbag likely standard or optional by 1985. Seat Belts: Three-point seat belts for front occupants, likely lap belts for rear. 💡 Technology Features Infotainment Audio System: Factory-installed Becker radio/cassette systems, often with power antenna. Driver Assistance Cruise Control: Standard cruise control system for highway driving. Connectivity Connectivity Features: Limited by modern standards; primarily focused on the vehicle's internal electronic systems. 🔧 Maintenance...