1979 Mercedes W126 SEC Service and Repair Manual

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🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 SEC Year: 1979 Codes Chassis Code: W126 Body Style Code: C126 👋 Introduction Market Position Target Audience: W126 SEC owners, independent mechanics,...

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标签: 1979 Car Cars Mercedes W126 W126 SEC

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Description

🏷️ Basic Information

Identification

Make:

Mercedes-Benz

Model:

W126 SEC

Year:

Codes

Chassis Code:

Body Style Code:

👋 Introduction

Market Position

Target Audience:

W126 SEC owners, independent mechanics, DIY enthusiasts

Competitive Analysis

Uniqueness:

Vehicle-specific, factory-derived information, not generic

Key Features

Ease Of Use:

Single, easy-to-use PDF manual, no flipping through books

Customization:

Print only necessary pages and diagrams

Value Proposition

Cost Savings:

Enables DIY repairs, reducing reliance on expensive dealership services

📋 Manual Details

Coverage Areas

Manual Type:

Service and Repair Manual

Language:

English

Format:

Page Count

Estimated Page Count:

Extensive (Detailed Coverage)

File Format

File Type:

Adobe PDF

Compatibility:

Windows (Vista 32/64, XP, ME, 98, NT, 2000) & Mac

📖 Manual Coverage

Systems Covered

Engine Mechanical:

Complete overhaul, rebuilding, tuning, troubleshooting

Engine Control System:

Diagnosis and repair of electronic fuel injection and ignition systems

Fuel System:

Fuel pump, injectors, fuel lines, pressure regulator, fuel tank service

Emission Control:

Catalytic converter, EGR system, evaporative emission control

Cooling System:

Radiator, fan, water pump, thermostat, coolant passages

Lubrication System:

Oil pump, oil filter, oil passages, oil cooler

Ignition System:

Distributor, ignition coil, spark plugs, wiring, ignition timing

Starting Charging System:

Starter motor, alternator, battery, charging circuit diagnosis

Automatic Transmission:

Service, repair, adjustments, fluid and filter changes

Manual Transmission:

Service, repair, clutch replacement, fluid changes

Drivetrain Shafts:

Propeller shaft, universal joints, drive shafts, CV joints

Differential Axles:

Rear axle service, differential overhaul, axle seals

Suspension System:

Front and rear suspension components, shock absorbers, bushings

Wheel Tire System:

Wheel bearings, tire mounting, balancing, alignment specifications

Brake Control:

Brake booster, master cylinder, ABS (if applicable), brake lines

Brake Service:

Disc brake replacement, caliper overhaul, brake pad replacement

Parking Brake:

Adjustment, cable replacement, mechanism service

Steering Column:

Steering column assembly, ignition switch, tilt mechanism

Power Steering:

Power steering pump, gearbox, fluid lines, troubleshooting

Air Conditioning:

Refrigerant service, compressor, evaporator, condenser, blower motor

Supplemental Restraint System:

Airbag system (if applicable), SRS warning lights, diagnostic procedures

Seat Belts:

Retractor mechanisms, buckles, adjustment

Engine Immobilizer:

Security system components and diagnosis (if equipped)

Cruise Control:

System components, vacuum lines, electronic control module

Wiper Washer System:

Wiper motor, linkage, washer pump, fluid reservoir

Door Lock System:

Power door locks, vacuum actuators, central locking system

Instrument Panel Gauges:

Speedometer, tachometer, fuel gauge, warning lamps, gauge cluster repair

Audio Visual Systems:

Radio, speakers, antenna, troubleshooting

Horn System:

Horn, horn button, relay, wiring

Windshield Glass Mirrors:

Windshield replacement, window seals, mirror adjustment

Interior Trim:

Door panels, dashboard components, seat upholstery, headliner

Exterior Body:

Body panels, bumpers, trim, door hinges, hood operation

Electrical System Overview:

Overall electrical component layout and function

Multiplex Can Communication:

Diagnosis and troubleshooting of electronic communication networks (where applicable to the model year)

Procedures Included

Maintenance Procedures:

Routine service, fluid changes, filter replacements, inspections

Diagnostic Procedures:

Troubleshooting charts, symptom-to-cause analysis, fault code interpretation

Repair Procedures:

Step-by-step instructions for all major mechanical and electrical components

Rebuilding Procedures:

Detailed instructions for engine, transmission, and differential rebuilds

Wiring Schematics:

Comprehensive electrical wiring diagrams for all systems

Diagrams Illustrations:

Detailed diagrams and illustrations to aid in disassembly, assembly, and repair

Technical Depth

Depth Of Coverage:

Factory-level, A-Z repairs, dealership technician level

📊 Manual Specifications

File Format

Printability:

Yes (all pages printable)

Searchability:

Likely searchable text within PDF

Print Quality

Image Resolution:

High (allows blow-up and enlargement)

Binding Type

Digital Binding:

Single PDF file

Paper Type

Digital Medium:

Digital (PDF)

⚙️ Engine Specifications

Primary Engine

Engine Type:

V8 (likely M116 or M117 series)

Displacement:

Likely 3.8L (M116) or 5.0L (M117) depending on specific 1979 SEC model

Performance

Horsepower Range:

Estimated 155-230 hp (depending on engine size and tuning)

Torque Range:

Estimated 200-280 lb-ft (depending on engine size)

Fuel System

Fuel Delivery:

Bosch K-Jetronic (CIS) mechanical fuel injection

Fuel Type:

Unleaded gasoline (premium recommended)

🔧 Transmission

Standard

Transmission Type:

4-speed automatic (e.g., 4G-TRONIC)

Optional

Manual Transmission:

Not typically offered for SEC models

Features

Transmission Fluid:

Dexron III (or equivalent) - specific capacity and change intervals detailed in manual

📐 Dimensions

Exterior

Body Style:

2-door Coupe

Weights

Curb Weight:

Approx. 3,700 - 4,000 lbs (depending on engine and options)

🛡️ Safety Features

Ratings

Crash Safety:

Designed to contemporary safety standards; early model may lack modern airbags/ABS as standard

Active Features

Anti Lock Brakes:

Optional on some models, standard on later variants; manual covers diagnosis/repair if equipped

Passive Features

Airbag System:

Driver airbag may be present on later 1979 models or optional; manual details its service if equipped

💡 Technology Features

Infotainment

Audio System:

Factory AM/FM radio with cassette player (optional)

Driver Assistance

Parking Assistance:

None (manual covers basic parking brake system)

🔧 Maintenance

Service Intervals

Oil Change Interval:

Refer to manual for specific interval (typically 3,000-5,000 miles or 6-12 months)

Fluid Specifications

Engine Oil:

Refer to manual for specific API service classification and viscosity grade (e.g., 10W-40 or 20W-50)

Coolant Type:

Ethylene glycol based, 50/50 mix with distilled water

Brake Fluid:

DOT 3 or DOT 4 (refer to manual for exact specification)

Known Issues

Common Problems:

Vacuum system leaks, aging fuel injection components, potential electrical gremlins, wear on suspension bushings

Technical Specifications

Spark Plug Gap:

Refer to manual for specific plug type and gap setting (e.g., 0.03-0.04 inches)

Ignition Timing:

Refer to manual for base timing specification (typically checked with a timing light)

📚 Vehicle History

Brand Heritage

Manufacturer:

Mercedes-Benz

Model Evolution

W126 Generation:

First generation of the S-Class Coupe, representing a significant leap in luxury and technology

Production

Production Period:

1979-1991 (W126 SEC)

Manufacturing Location:

Germany

🏆 Awards & Recognition

Recognitions

Prestige:

Considered a benchmark of automotive luxury and engineering for its era