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1979 Mercedes W126 SE Service and Repair Manual

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🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 S-Class Model Variant: SE Model Year: 1979 Codes Chassis Code: W126 👋 Introduction Market Position Market Position: Premium luxury sedan, representing Mercedes-Benz's...
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1979 Mercedes W126 SE Service and Repair Manual
🏷️ Basic Information
Identification
Make:
Mercedes-Benz
Model:
W126 S-Class
Model Variant:
SE
Model Year:
1979
Codes
Chassis Code:
W126
👋 Introduction
Market Position
Market Position:
Premium luxury sedan, representing Mercedes-Benz's flagship offerings for the era.
Competitive Analysis
Competitors:
Competed against other high-end sedans such as BMW 7 Series, Jaguar XJ, and Cadillac Fleetwood.
Key Features
Key Features:
Exceptional build quality, advanced engineering for its time, sophisticated ride comfort, and elegant styling.
Manual Utility
Manual Utility:
Provides detailed, vehicle-specific instructions to empower owners and technicians for maintenance and repair.
📋 Manual Details
Coverage Areas
All Models And Repairs:
A-Z
Page Count
Estimated Page Count:
Not specified, but comprehensive for full service
Manual Type
Manual Type:
Factory Service and Repair Manual
Language
Language:
English
Format
Digital Format:
PDF
📖 Manual Coverage
Systems Covered
Engine System:
Complete diagnosis, overhaul, and repair of all engine components.
Fuel System:
Fuel injection system (K-Jetronic), fuel pump, lines, and tank service.
Emission Control:
Diagnosis and repair of emission control systems, including catalytic converter operation.
Cooling System:
Radiator, fan, water pump, thermostat, and coolant flow diagnostics.
Lubrication System:
Oil pump, oil filter, lubrication passages, and oil pressure checks.
Ignition System:
Distributor, ignition coil, spark plugs, and timing adjustments.
Charging System:
Alternator, voltage regulator, battery, and charging circuit diagnosis.
Automatic Transmission:
Service, overhaul, and diagnosis of automatic transmission (e.g., 4-speed 722.1).
Manual Transmission:
Service and repair of manual transmission options, if applicable for SE variant.
Drive Axle And Differential:
Rear axle assembly, differential service, and drive shaft maintenance.
Suspension System:
Front and rear suspension, shock absorbers, springs, and bushings.
Brake System:
Hydraulic brake system, calipers, rotors, brake lines, and ABS (if applicable).
Parking Brake:
Operation, adjustment, and repair of the parking brake mechanism.
Steering System:
Steering column, steering gear, and power steering system service.
Air Conditioning:
Diagnosis, recharging, and repair of the A/C system.
Electrical System:
Comprehensive wiring schematics, component testing, and diagnosis.
Body And Interior:
Door locks, windows, seats, instrument panel, exterior trim, and interior panels.
Cruise Control:
Diagnosis and repair of the cruise control system.
Wiper And Washer:
Wiper motor, linkage, and washer system service.
Supplemental Restraint System:
Seat belt mechanisms and related components.
Procedures Included
Maintenance:
Scheduled maintenance, fluid changes, filter replacements, and inspections.
Diagnostics:
Troubleshooting guides, fault code interpretation (where applicable), and systematic diagnostic procedures.
Repair:
Detailed step-by-step repair instructions for all vehicle systems.
Overhaul And Rebuild:
Complete procedures for engine, transmission, and major component overhauls.
Wiring Schematics:
Complete and detailed electrical wiring diagrams for all vehicle circuits.
Specifications:
Torque values, clearances, fluid capacities, and other critical specifications.
Technical Depth
Technical Depth:
Factory-level, in-depth technical information for professional technicians and serious DIY enthusiasts.
📊 Manual Specifications
File Format
File Format:
PDF (Portable Document Format)
Print Quality
Printability:
All pages are printable, with ability to enlarge images.
Binding Type
Binding Type:
N/A (Digital PDF)
Paper Type
Paper Type:
N/A (Digital PDF)
Software Requirements
Required Software:
Adobe PDF Reader, Winzip (free online)
Compatibility
Operating Systems:
Windows (Vista 32/64, XP, ME, 98, NT, 2000) and Mac compatible
⚙️ Engine Specifications
Primary Engine
Engine Type 1979 Se:
Inline-6, SOHC
Engine Displacement 1979 Se:
2.8 Liters (2746 cc)
Engine Code Typical:
M110
Performance
Horsepower 1979 Se:
Approximately 138-142 hp (DIN) depending on market and tune
Torque 1979 Se:
Approximately 220-225 Nm (DIN) depending on market and tune
Fuel System
Fuel Injection System:
Bosch K-Jetronic (CIS - Continuous Injection System)
Fuel Type Required:
Unleaded gasoline (Octane rating varies by market)
🔧 Transmission
Standard
Standard Transmission:
4-speed automatic transmission (e.g., 722.1)
Optional
Optional Transmission:
5-speed manual transmission (less common on SE, more on SEC/SD)
Features
Automatic Transmission Features:
Hydraulically controlled, smooth shifting, torque converter lock-up (in higher gears).
📐 Dimensions
Exterior
Wheelbase:
2,935 mm (115.6 inches)
Length:
4,995 mm (196.7 inches)
Width:
1,800 mm (70.9 inches)
Height:
1,428 mm (56.2 inches)
Weights
Curb Weight Approx:
1,650 - 1,750 kg (3,638 - 3,858 lbs)
🛡️ Safety Features
Ratings
Safety Ratings:
Not officially rated by modern standards, but known for robust construction.
Active Features
Active Safety Features:
Four-wheel disc brakes with ABS (Anti-lock Braking System) availability.
Passive Features
Passive Safety Features:
Reinforced passenger cell, crumple zones, padded interior surfaces, laminated windshield.
💡 Technology Features
Infotainment
Infotainment System Type:
Period-appropriate analog radio, cassette player. Later models may have had upgraded audio systems.
Driver Assistance
Driver Assistance Features:
Cruise control, power windows, power seats, power steering, ABS (Anti-lock Braking System).
Connectivity
Connectivity Features:
Limited by era; primarily focused on internal systems and basic vehicle operation.
🔧 Maintenance
Service Intervals
Oil Change Interval:
Typically every 5,000 - 7,500 miles (8,000 - 12,000 km) or annually, refer to manual for specific mileage.
Major Service Interval:
30,000 - 60,000 miles (50,000 - 100,000 km) for checks of major components, belts, hoses.
Fluid Specifications
Engine Oil Type:
API SG/SH or equivalent, viscosity 10W-40 or 20W-50 (depending on climate and specific engine variant). Consult manual for exact specification.
Coolant Type:
Ethylene glycol based antifreeze/coolant, typically a 50/50 mix with distilled water.
Transmission Fluid Type:
Dexron II or III for automatic transmissions. Consult manual for specific type and capacity.
Brake Fluid Type:
DOT 3 or DOT 4 hydraulic brake fluid.
Known Issues
Common Issues:
Biodegradable wiring insulation degradation, vacuum leak issues (due to brittle hoses), fuel distributor diaphragm wear, sagging headliner, heater control valve failure, suspension component wear (ball joints, bushings).
Parts Information
Filter Part Numbers Example:
Oil filter (e.g., Mann W920/17 or equivalent), Air filter (e.g., Mann C2521 or equivalent). Specific part numbers are critical and available in the manual.
📚 Vehicle History
Brand Heritage
Brand Heritage:
Mercedes-Benz's legacy of engineering excellence, luxury, and durability.
Model Evolution
W126 Introduction:
Introduced in 1979 as a replacement for the W116 S-Class.
W126 Generation:
First generation of the S-Class to feature aerodynamic improvements and advanced safety features.
Production
Production Period:
1979 - 1991
Manufacturing Locations:
Germany (Sindelfingen)
🏆 Awards & Recognition
Recognitions
Industry Recognition:
Consistently ranked as one of the best luxury sedans of its era by automotive publications.
Certifications
Manufacturing Certifications:
Produced under Mercedes-Benz's stringent quality control standards.
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