Mercedes-Benz W126 Service Repair Manual

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🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 Model Line: S-Class Generation Generation Designation: First Generation S-Class (W126) Codes Chassis Code: W126 👋 Introduction Market Position Target Audience: DIY enthusiasts,...

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Mots clés: Car Cars Mercedes Mercedes-benz W126

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Description

🏷️ Basic Information

Identification

Make:

Mercedes-Benz

Model:

Model Line:

S-Class

Generation

Generation Designation:

First Generation S-Class (W126)

Codes

Chassis Code:

👋 Introduction

Market Position

Target Audience:

DIY enthusiasts, independent repair shops, and owners of Mercedes-Benz W126 vehicles seeking detailed technical information.

Competitive Analysis

Value Proposition:

Provides the same level of detail as professional workshop manuals, enabling users to perform complex repairs and maintenance, saving significant costs.

Key Features

Completeness:

Extremely detailed compilation covering all aspects of the W126 model range.

Accessibility:

PDF format allows for easy access, search, and printing of specific sections.

User Friendliness:

Easy-to-follow, step-by-step instructions with clear diagrams suitable for various skill levels.

📋 Manual Details

Coverage Areas

Primary Coverage:

Comprehensive service, repair, and maintenance for all Mercedes-Benz W126 models.

Specific Systems:

Engine, fuel injection, ignition, clutch, gearbox, drivetrain, suspension, steering, brakes, climate control, electrical system, bodywork, interior.

Page Count

Estimated Page Count:

Varies by specific edition, but typically over 1000 pages for a complete set.

Manual Type

Type:

Factory Service Manual / Workshop Manual

Language

Language:

English

Format

Format:

📖 Manual Coverage

Systems Covered

Engine Mechanical:

Detailed procedures for engine disassembly, assembly, overhaul, timing, and component replacement.

Fuel Injection And Ignition:

In-depth coverage of KE-Jetronic, K-Jetronic, and related ignition systems, including diagnostics and adjustments.

Transmission Drivetrain:

Service and repair for automatic transmissions (e.g., 722.3, 722.4, 722.5) and manual transmissions, including differential and drive shafts.

Suspension Steering:

Maintenance, repair, and alignment for independent front and rear suspension, power steering system.

Braking System:

Front and rear brake system service, including ABS (Antilock Braking System) on applicable models.

Electrical System:

Comprehensive wiring diagrams, component location, troubleshooting, and repair for all electrical circuits.

Climate Control:

Service and repair for manual and automatic climate control systems (Air Temp Control System).

Bodywork And Interior:

Body panel repair, door mechanisms, glass replacement, interior trim, and seating adjustments.

Procedures Included

Routine Maintenance:

Oil changes, filter replacements, spark plug replacement, fluid checks and changes, belt inspections and replacement.

Diagnostics And Troubleshooting:

Step-by-step diagnostic procedures for common issues across all major systems.

Component Replacement:

Detailed instructions for replacing components such as alternators, starters, water pumps, fuel pumps, brake calipers, etc.

Engine Rebuilding:

Complete instructions for engine teardown, inspection, machining, and reassembly.

Transmission Overhaul:

Detailed procedures for the complete disassembly, repair, and reassembly of automatic and manual transmissions.

Electrical Component Repair:

Repair and replacement of electrical components like control modules, sensors, actuators, and wiring harnesses.

Specific Tool Requirements:

Identifies and describes the use of specialized Mercedes-Benz tools where necessary for certain procedures.

Technical Depth

Depth:

Extremely detailed, covering everything from basic fluid changes to complete engine and transmission overhauls. Includes diagnostic fault codes and procedures.

Diagrams Illustrations:

Extensive use of step-by-step diagrams, exploded view diagrams, and detailed technical illustrations.

Data Tables:

Includes essential technical data such as torque specifications, fluid capacities, valve clearances, and engine timing settings.

Wiring Diagrams Detail:

Detailed, often color-coded, wiring diagrams for all electrical systems, including component identification and circuit functions.

📊 Manual Specifications

File Format

Format:

Searchability:

Searchable text within PDF for quick access to information.

Distribution Method:

Digital download of PDF files.

Print Quality

Printability:

All pages are printable, allowing users to create physical copies of specific sections.

Binding Type

Binding:

N/A (Digital PDF Format)

Paper Type

Paper Type:

N/A (Digital PDF Format)

⚙️ Engine Specifications

Primary Engine

Common Engines:

M103 (2.6L, 3.0L I6), M110 (2.8L I6), M116 (3.8L V8), M117 (4.2L, 5.0L V8), M104 (3.0L, 3.2L I6 - later models).

Performance

Hp Range:

Approximately 150 hp (2.6L) to over 240 hp (5.6L AMG variants).

Torque Range:

Approximately 177 lb-ft (2.6L) to over 330 lb-ft (5.6L).

Fuel System

Injection Systems:

Bosch K-Jetronic (CIS), KE-Jetronic (CIS-E), and later LH-Jetronic fuel injection systems.

Fuel Type:

Unleaded gasoline (Premium).

Technical Data

Timing Belt Chain:

Timing chain for most M103, M116, M117 engines; timing belt for M104.

🔧 Transmission

Standard

Default Transmission:

4-speed automatic transmission (e.g., 722.3, 722.4) was standard on most models.

Optional

Optional Transmission:

5-speed manual transmission was available on some early models and specific engines (e.g., M110).

Features

Automatic Transmission Features:

Hydraulic control, torque converter lock-up, sport/economy modes on some variants.

Fluid Specifications

Automatic Transmission Fluid Type:

Typically Mercedes-Benz Specification 236.6 or 236.7 (e.g., Dexron II).

📐 Dimensions

Exterior

Body Styles:

4-door Sedan (Saloon) and 2-door Coupe.

Length Sedan Approx:

5020 mm (197.6 in)

Length Coupe Approx:

4965 mm (195.5 in)

Weights

Curb Weight Approx:

1650 kg - 1900 kg (3638 - 4189 lbs) depending on engine and options.

🛡️ Safety Features

Ratings

Passive Safety:

Designed with significant passive safety features including crumple zones, reinforced passenger cell, and dual-circuit braking.

Active Features

Antilock Braking System:

ABS (Antilock Braking System) was an option and became standard on later models.

Passive Features

Airbags:

Driver's side airbag became available as an option in later years of the W126 generation.

💡 Technology Features

Infotainment

Audio Systems:

Factory-installed AM/FM radio with cassette player, optional CD changer for later models.

Climate Control Technology:

Manual climate control or fully automatic climate control with electronic temperature regulation and air distribution on higher trims/later models.

Driver Assistance

Cruise Control:

Standard cruise control on most models.

Connectivity

Early Phone Integration:

Optional early mobile phone integration kits were available.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Typically every 15,000 km (9,300 miles) or 12 months, whichever comes first (refer to manual for specific engine/oil type).

Transmission Fluid Change:

Recommended every 40,000 - 60,000 km (25,000 - 37,000 miles) for automatic transmissions.

Fluid Specifications

Engine Oil Specification:

API SG or higher, SAE 10W-40 or 15W-40 (depending on climate). Consult manual for exact MB approval numbers (e.g., MB 229.1).

Coolant Type:

Mercedes-Benz approved antifreeze/coolant (e.g., G48, typically ethylene glycol based with specific inhibitors).

Brake Fluid Type:

DOT 3 or DOT 4.

Known Issues

Common Wear Items:

Engine mounts, suspension bushings, fuel distributor seals, climate control O-rings, SRS warning light (if equipped).

Electrical Common Problems:

Wire harness degradation in engine bay, vacuum leaks affecting climate control and idle, vacuum actuator failures.

📚 Vehicle History

Brand Heritage

Manufacturer:

Mercedes-Benz

Model Evolution

Production Years:

1979-1991

Facelifts:

Two significant facelifts: 1985 (major update to front/rear styling, engines, and interior) and 1989 (minor updates).

Production

Manufacturing Locations:

Germany (Sindelfingen plant).

Production Volume:

Approximately 818,000 units produced across all variants.

🏆 Awards & Recognition

Recognitions

Design Acclaim:

The W126 S-Class was widely praised for its elegant design, build quality, and technological advancements, setting a benchmark for luxury sedans.

Ratings

Industry Perception:

Considered a highly reliable and well-engineered vehicle, often referred to as 'the best car in the world' during its production era.