Positioning:
A premium service and repair manual for an iconic luxury sedan, targeting owners and independent repair shops seeking authentic, detailed information.
Uniqueness:
Distinguishes itself from generic repair guides by providing vehicle-specific, factory-level data used by authorized technicians.
Ease Of Use:
Single, easy-to-use PDF manual format with searchability and selective printing.
Comprehensiveness:
Covers all models and all repairs A-Z, ensuring no aspect of the vehicle's maintenance or repair is overlooked.
Primary Coverage:
Service, Repair, Maintenance, Diagnosis
Scope:
All Models & All Repairs A-Z
Estimated Pages:
Extensive (Specific page count not provided, but described as comprehensive)
Type:
Factory Service and Repair Manual
Engine:
Detailed coverage of engine systems, including maintenance, diagnosis, and repair.
Fuel System:
Comprehensive fuel service specifications, including injection and delivery systems.
Emission Control:
In-depth information on emission control systems and related components.
Cooling Lubrication:
Coverage of cooling system and lubrication system maintenance and repair.
Ignition Charging Starting:
Detailed diagnostics and repair procedures for ignition, starting, and charging systems.
Transmission:
Coverage for automatic transmissions, including service, diagnosis, and repair. Manual transmission coverage if applicable to specific W126 variants.
Drivetrain:
Information on transfer cases, propeller shafts, drive shafts, differentials, and axles/suspension.
Brakes:
Complete coverage of brake control systems, including hydraulic, disc, drum, and parking brake mechanisms.
Steering:
Detailed information on steering column and power steering systems.
Climate Control:
Specific procedures for air conditioning system maintenance and repair.
Electrical Systems:
Extensive coverage of the vehicle's electrical system, including wiring schematics, diagnosis, and component repair.
Interior Exterior:
Procedures for interior and exterior components, including seats, doors, engine hood, glass, and mirrors.
Restraint Systems:
Information on supplemental restraint systems and seat belts.
Comfort Convenience:
Coverage of systems such as cruise control, windshield wipers/washers, door locks, and horn.
Instrumentation Audio:
Details on instrument panel operation, meter functions, and audio/visual systems.
Maintenance:
Complete step-by-step instructions for routine maintenance tasks.
Diagnosis:
Diagnostic procedures for identifying and resolving vehicle issues.
Repair:
Detailed instructions for all types of repairs, from minor adjustments to major component overhauls.
Troubleshooting:
Troubleshooting guides and flowcharts for common and uncommon problems.
Depth:
Factory-level, highly detailed information, equivalent to what dealership technicians use.
Visual Aids:
Includes diagrams, illustrations, and wiring schematics.
Searchability:
PDF format allows for keyword searching and blowing up images for clarity.
Compatibility:
Windows (Vista32/64, XP, ME, 98, NT, 2000) and Mac compatible.
Requirements:
Adobe PDF Reader and WinZip (free online).
Printability:
All pages are printable, allowing for selective printing of needed pages and diagrams.
Binding:
Digital (PDF) - No physical binding; replaces greasy/torn paper manuals.
Paper Type:
N/A (Digital format)
Engine Type:
Likely a V8 gasoline engine, common for the W126 SEL in this era (e.g., M116 or M117).
Engine Code Examples:
M116 (3.8L V8) or M117 (4.5L or 5.0L V8) - specific to the 1979 SEL model.
Horsepower Range:
Approximately 155-200 hp (depending on engine displacement and specific market tune).
Torque Range:
Approximately 200-250 lb-ft (depending on engine displacement and specific market tune).
Fuel Delivery:
Bosch K-Jetronic (CIS - Continuous Injection System) mechanical fuel injection.
Fuel Type:
Unleaded gasoline (likely premium grade).
Transmission Type:
4-speed automatic transmission (e.g., 4G-TRONIC).
Optional Transmission:
While rare for the SEL, manual transmissions were available on other W126 models. This manual may cover if applicable.
Transmission Fluid Type:
Likely Dexron II or equivalent ATF (Automatic Transmission Fluid) - refer to specific manual for exact specification (e.g., MB-Approval 236.7).
Wheelbase:
Approximately 116.5 inches (2959 mm) for the SEL long wheelbase.
Overall Length:
Approximately 201.5 inches (5118 mm) for the SEL.
Curb Weight:
Approximately 4000-4300 lbs (1814-1950 kg) depending on engine and options.
Gross Vehicle Weight Rating:
Refer to specific vehicle VIN or manual for exact GVWR.
Safety Standards:
Designed to meet rigorous safety standards of its era. Specific crash test ratings from independent bodies may vary by market and year.
Passive Safety:
Reinforced body structure, crumple zones, padded interior, laminated windshield, safety glass.
Seat Belts:
Three-point seat belts for front and rear occupants.
Infotainment System:
Basic analog radio (AM/FM) with optional cassette player. Often features advanced for its time sound insulation.
Driver Assistance Features:
Limited by modern standards; key features included power steering, cruise control, and anti-lock braking system (ABS) on some models.
Connectivity Features:
No modern connectivity features (e.g., Bluetooth, USB, smartphone integration).
Oil Change Interval:
Typically every 5,000-7,500 miles or 6-12 months, depending on driving conditions (refer to manual for precise interval).
Major Service Interval:
Major services often scheduled around 30,000 miles or 2-3 years, encompassing a broader range of checks and replacements.
Engine Oil Spec:
Likely API SF or SG, SAE 10W-30 or 15W-40 viscosity depending on climate (e.g., MB-Approval 227.1 or 228.1).
Coolant Spec:
Ethylene glycol-based coolant, typically a 50/50 mix with distilled water. MB-Approval 325.0 for specific coolant concentrate.
Brake Fluid Spec:
DOT 3 or DOT 4 brake fluid.
Common W126 Issues:
Potential for vacuum system leaks (climate control, central locking), fuel distributor issues (K-Jetronic), wear on suspension bushings, aging wiring harnesses, and rust in common areas.
Manual Benefit For Issues:
The manual provides detailed diagnostic procedures and repair instructions specifically for these common issues.
Heritage:
Mercedes-Benz has a long-standing reputation for engineering excellence, luxury, and safety dating back to its origins.
W126 Introduction:
The W126 chassis replaced the W116 and was produced from 1979 to 1991, setting new standards for automotive design, safety, and engineering.
Sel Variant:
The SEL designation signifies the long-wheelbase version, offering increased rear legroom and luxury appointments, making it the flagship of the W126 line.
Production Period W126:
1979-1991
Manufacturing Locations:
Primarily Germany (Sindelfingen plant), with some assembly in other locations.
