Mercedes Benz W126 1979-1992 Workshop Repair Service Manual

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🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 S-Class Chassis Code: W126 Body Styles: SE (Standard wheelbase sedan), SEL (Long wheelbase sedan), SEC (Coupé) 👋 Introduction Market Position Class: Full-size luxury sedan and coupé Target Audience: Affluent consumers seeking comfort, safety, and performance. Competitive Analysis Key Competitors: BMW 7 Series, Audi V8, Jaguar XJ, Cadillac Fleetwood Key Features Design Philosophy: Timeless design, robust engineering, and advanced comfort features for its era. Build Quality: Renowned for exceptional build quality and durability. Technology Integration: Incorporated early forms of electronic fuel injection, ABS, and climate control systems. 📋 Manual Details Coverage Areas Covered Years: 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992 Page Count Total Pages: 7289 Manual Type Type: Workshop Service Manual Language Language: English Format File Format: PDF 📖 Manual Coverage Systems Covered Engine: Comprehensive coverage of engine overhaul, tune-ups, and diagnostics. Fuel System: Detailed information on fuel injection, carburetors (early models), fuel pumps, lines, and filters. Ignition System: Diagnosis and repair of ignition coils, distributors, spark plugs, and electronic ignition modules. Lubrication System: Oil pump, oil filter, oil cooler, and lubrication circuit maintenance. Cooling System: Radiator, water pump, thermostat, hoses, and climate control integration. Exhaust System: Catalytic converters, mufflers, exhaust manifolds, and emission control systems. Electrical System: Complete wiring diagrams, component testing, troubleshooting of charging system, starting system, lighting, and accessories. Transmission Manual: Repair and overhaul procedures for manual transmissions (less common). Transmission Automatic: Detailed diagnosis, repair, and adjustment of automatic transmissions, including hydraulic systems and valve bodies. Drivetrain: Driveshafts, CV joints, differentials, and axle shafts. Suspension: Front and rear suspension components, shock absorbers, springs, and bushings. Steering: Power steering system, steering column, tie rods, and steering gear. Brakes: Hydraulic brake system, ABS (Anti-lock Braking System), brake calipers, discs, pads, lines, and master cylinder....

Tipo: Car

Proveedor:

SKU: 422698

Colecciones: ALL

Etiquetas: 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 Car Cars Mercedes Mercedes-benz W126

Variantes de producto

Descripción

🏷️ Basic Information

Identification

Make:

Mercedes-Benz

Model:

W126 S-Class

Chassis Code:

Body Styles:

SE (Standard wheelbase sedan), SEL (Long wheelbase sedan), SEC (Coupé)

👋 Introduction

Market Position

Class:

Full-size luxury sedan and coupé

Target Audience:

Affluent consumers seeking comfort, safety, and performance.

Competitive Analysis

Key Competitors:

BMW 7 Series, Audi V8, Jaguar XJ, Cadillac Fleetwood

Key Features

Design Philosophy:

Timeless design, robust engineering, and advanced comfort features for its era.

Build Quality:

Renowned for exceptional build quality and durability.

Technology Integration:

Incorporated early forms of electronic fuel injection, ABS, and climate control systems.

📋 Manual Details

Coverage Areas

Covered Years:

1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992

Page Count

Total Pages:

Manual Type

Type:

Workshop Service Manual

Language

Language:

English

Format

File Format:

📖 Manual Coverage

Systems Covered

Engine:

Comprehensive coverage of engine overhaul, tune-ups, and diagnostics.

Fuel System:

Detailed information on fuel injection, carburetors (early models), fuel pumps, lines, and filters.

Ignition System:

Diagnosis and repair of ignition coils, distributors, spark plugs, and electronic ignition modules.

Lubrication System:

Oil pump, oil filter, oil cooler, and lubrication circuit maintenance.

Cooling System:

Radiator, water pump, thermostat, hoses, and climate control integration.

Exhaust System:

Catalytic converters, mufflers, exhaust manifolds, and emission control systems.

Electrical System:

Complete wiring diagrams, component testing, troubleshooting of charging system, starting system, lighting, and accessories.

Transmission Manual:

Repair and overhaul procedures for manual transmissions (less common).

Transmission Automatic:

Detailed diagnosis, repair, and adjustment of automatic transmissions, including hydraulic systems and valve bodies.

Drivetrain:

Driveshafts, CV joints, differentials, and axle shafts.

Suspension:

Front and rear suspension components, shock absorbers, springs, and bushings.

Steering:

Power steering system, steering column, tie rods, and steering gear.

Brakes:

Hydraulic brake system, ABS (Anti-lock Braking System), brake calipers, discs, pads, lines, and master cylinder.

Body:

Body panel removal and installation, door mechanisms, window regulators, sealing, and interior trim.

Climate Control:

HVAC system diagnosis, repair, refrigerant handling, and component replacement.

Safety Systems:

Seat belts, airbags (if equipped on later models), and structural integrity.

Procedures Included

Maintenance:

Routine maintenance procedures, fluid changes, filter replacements, and lubrication.

Troubleshooting:

Diagnostic procedures for identifying and resolving common and complex faults across all systems.

Repair:

Step-by-step repair instructions for virtually all components and systems.

Overhaul:

Detailed procedures for complete disassembly, inspection, repair, and reassembly of major components like engines and transmissions.

Removal Installation:

Instructions for removing and installing major components and sub-assemblies.

Adjustments:

Procedures for setting clearances, calibrations, and alignments for various systems.

Technical Depth

Depth:

Advanced, suitable for professional technicians and experienced DIY enthusiasts.

Detail Level:

Emphasizes special aspects of Mercedes-Benz products and proprietary component repairs.

Special Tools:

Identification and illustration of required or recommended Mercedes-Benz special tools.

Warnings Cautions Notes:

Clear highlighting of safety warnings, cautions, and important notes.

📊 Manual Specifications

File Format

Format:

Readability:

High quality, printable

Searchability:

Likely searchable text within PDF for efficient information retrieval.

Print Quality

Printable:

Binding Type

Binding:

N/A (Digital PDF)

Paper Type

Paper Type:

N/A (Digital PDF)

⚙️ Engine Specifications

Primary Engine

Engine Families:

M110 (2.8L, 3.0L Inline-6), M117 (3.8L, 4.2L, 5.0L V8), M119 (5.0L V8 - later models)

Engine Variants

Common Engines:

300SE/SEL (3.0L I6), 380SE/SEL/SEC (3.8L V8), 420SE/SEL (4.2L V8), 500SE/SEL/SEC (5.0L V8), 560SE/SEL/SEC (5.6L V8)

Performance

Horsepower Range:

Approximately 145 HP (early 3.0L I6) to 240 HP (late 5.6L V8)

Torque Range:

Approximately 170 lb-ft to 330 lb-ft

Fuel System

Injection Type:

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

Fuel Requirements

Octane Rating:

Premium unleaded gasoline (91+ octane) generally recommended.

Engine Management

Engine Control Module (ECM) or Electronic Control Unit (ECU) for fuel and ignition management on later models.

🔧 Transmission

Standard

Transmission Type:

4-speed automatic transmission (722.3/722.4) was standard on most models. 5-speed manual was optional on some earlier models.

Optional

Manual Transmission:

Rare, typically a 4-speed manual found on base European models.

Features

Automatic Features:

Hydraulically controlled, with comfort-oriented shift points. Some models featured 'Economy' and 'Sport' modes.

Fluid Specifications

Automatic Transmission Fluid:

MB Specification 236.1 (e.g., Dexron II or equivalent).

📐 Dimensions

Exterior

Wheelbase Standard:

Approx. 114.9 inches (2920 mm)

Wheelbase Long:

Approx. 121.3 inches (3080 mm) for SEL models

Length:

Varies by body style, but generally around 197-203 inches (5000-5160 mm)

Weights

Curb Weight:

Approx. 3,700 - 4,400 lbs (1680 - 2000 kg) depending on engine and configuration.

Gross Vehicle Weight Rating:

Varies by model, typically around 5,000 lbs.

🛡️ Safety Features

Ratings

Crash Safety:

Designed to high Mercedes-Benz safety standards of the era, with a strong unibody construction and safety cell.

Active Features

Anti-lock Braking System (ABS) was available and standard on later models.

Traction Control:

ASR (Acceleration Slip Regulation) was introduced on some later models.

Passive Features

Airbags:

Driver airbag became optional and then standard in later years of production.

Seat Belts:

Pre-tensioning front seat belts.

Crumple Zones:

Engineered with front and rear crumple zones for impact energy absorption.

💡 Technology Features

Infotainment

Audio System:

Factory-installed AM/FM radio with cassette player, often with multiple speakers and amplifier systems.

Driver Assistance

Cruise Control:

Standard cruise control on most models.

Parking Assistance:

Early parking assistance systems (e.g., parking sensors) were not common but may have been aftermarket additions.

Connectivity

Auxiliary Input:

No factory auxiliary input; aftermarket solutions often involve cassette adapters or FM transmitters.

Other Features

Power Seats:

Power-adjustable front seats with memory functions were available.

Power Windows Locks:

Standard power windows and door locks.

🔧 Maintenance

Service Intervals

Oil Change:

Typically every 5,000 - 7,500 miles or 12 months, whichever comes first, using synthetic or high-quality conventional oil.

Transmission Service:

Fluid and filter change recommended every 30,000 - 60,000 miles.

Spark Plugs:

Intervals vary by engine type; consult manual. Typically 30,000 - 60,000 miles for standard plugs, longer for iridium/platinum.

Fluid Specifications

Engine Oil:

API SJ or higher; viscosity typically 10W-30 or 15W-40 depending on climate. Refer to owner's manual for precise specifications.

Coolant:

Ethylene glycol-based antifreeze with corrosion inhibitors. MB Specification 325.0 or equivalent.

Brake Fluid:

DOT 3 or DOT 4.

Known Issues

Wiring Harness:

Cracking insulation on older wiring harnesses, particularly in the engine bay and under the dashboard, can lead to electrical faults.

Fuel Injector Seals:

Leaking fuel injector seals on K-Jetronic systems can cause rough idling and fuel smell.

Climate Control:

Climate control unit failures, vacuum leaks, and blower motor issues are common.

Head Gasket:

While generally robust, head gasket leaks can occur on high-mileage engines.

Suspension Components:

Wear in ball joints, tie rod ends, and control arm bushings is common due to age and mileage.

Window Regulators:

Electric window regulators can fail, often due to plastic gear wear or motor issues.

📚 Vehicle History

Brand Heritage

Manufacturer:

Daimler-Benz AG (now Mercedes-Benz Group AG)

Model Evolution

Generation:

Second generation S-Class.

Facelift:

Received a significant facelift in 1985 (model year 1986), introducing updated engines (e.g., 5.6L V8), aerodynamic improvements, revised interior, and available ABS and airbags.

Production

Production Years:

1979-1991 (for the W126 chassis itself)

Manufacturing Location:

Sindelfingen, Germany.

🏆 Awards & Recognition

Recognitions

Consumer Reports:

Consistently ranked highly by automotive publications for reliability and comfort during its production run.

Automotive Journalism:

Widely praised for setting benchmarks in luxury, engineering, and safety for its time.

Certifications

Safety Standards:

Met and exceeded prevailing automotive safety standards of its era.