1991 Mercedes W126 SEL Service and Repair Manual

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🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 SEL Year: 1991 Generation Generation Designation: Second Generation (Facelifted) Codes Chassis Code: W126 Body Style Code: SEL (Special Long Sedan) 👋 Introduction...

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Taper: Car

Distributeur:

UGS: 459782

Mots clés: 1991 Car Cars Mercedes W126 W126 SEL

Variantes de produits

Description

🏷️ Basic Information

Identification

Make:

Mercedes-Benz

Model:

W126 SEL

Year:

Generation

Generation Designation:

Second Generation (Facelifted)

Codes

Chassis Code:

Body Style Code:

SEL (Special Long Sedan)

👋 Introduction

Market Position

Target Audience:

Enthusiasts, DIY mechanics, and professional technicians seeking definitive repair information for the W126 SEL.

Value Proposition:

Provides dealership-level repair accuracy and completeness, empowering users to maintain and repair their vehicle efficiently.

Competitive Analysis

Advantage:

Vehicle-specific, factory-authorized content, offering superior accuracy over generic repair guides.

Key Features

Feature 1:

Step-by-step instructions with clear diagrams and illustrations.

Feature 2:

Comprehensive wiring schematics for accurate electrical troubleshooting.

Feature 3:

All information contained in a single, easy-to-navigate PDF.

Feature 4:

Printable pages for use in the workshop without damaging the original file.

📋 Manual Details

Coverage Areas

Primary Coverage:

Comprehensive service, repair, diagnostic, and maintenance for 1991 Mercedes-Benz W126 SEL models.

Secondary Coverage:

All models and all repairs from A-Z, including specific sub-systems.

Page Count

Estimated Page Count:

Estimated 1500-2500 pages (typical for factory service manuals of this era).

Manual Type

Type:

Factory Service and Repair Manual

Language

Language:

English

Format

Digital Format:

📖 Manual Coverage

Systems Covered

Engine:

Detailed coverage of engine systems, including diagnostics, repair, and overhaul.

Control System:

Engine control unit (ECU) diagnostics and calibration.

Mechanical:

In-depth mechanical system repair and overhaul.

Fuel Service:

Fuel system diagnostics, repair, and specifications.

Emission Control:

Emission control systems, diagnostics, and adjustment procedures.

Intake Exhaust Cooling:

Complete coverage of intake, exhaust, and cooling systems.

Lube:

Lubrication system maintenance and specifications.

Ignition Starting Charging:

Ignition, starting, and charging system diagnostics and repair.

Auto Transmission:

Automatic transmission service, repair, and troubleshooting.

Manual Transmission:

Coverage for manual transmission variants (if applicable to the specific W126 SEL).

Drivetrain:

Transfer case, propeller shaft, drive shaft, differential, and axle maintenance and repair.

Suspension:

Axle, suspension, and wheel alignment procedures and specifications.

Tire Wheel:

Tire and wheel specifications and service.

Brake Control:

Brake control systems, including ABS diagnostics and repair.

Brakes:

Complete brake system service and repair.

Parking Brake:

Parking brake system maintenance and adjustment.

Steering Column:

Steering column and tilt/telescope mechanisms.

Power Steering:

Power steering system diagnostics, repair, and fluid specifications.

Air Conditioning:

Air conditioning system service, recharge, and repair.

Restraint System:

Supplemental Restraint System (SRS) components and diagnostics (airbags).

Seat Belt:

Seat belt system maintenance and repair.

Immobilizer:

Engine immobilizer system diagnostics and repair (if equipped).

Cruise Control:

Cruise control system diagnostics and repair.

Wiper Washer:

Wiper and washer system maintenance and repair.

Door Lock:

Door lock and central locking system service.

Meter Audio Visual:

Instrument cluster, meter functions, and audio/visual system diagnostics.

Horn:

Horn system diagnosis and repair.

Windshield Glass Mirror:

Windshield, glass, and mirror replacement and service.

Instrument Panel:

Instrument panel removal, installation, and component repair.

Seat:

Seat adjustment mechanisms and upholstery repair.

Engine Hood Door:

Hood and door mechanisms, hinges, and latches.

Exterior Interior:

Exterior trim, interior trim, and body panel repair.

Electrical:

Comprehensive electrical system diagnosis and repair.

Multiplex Can Communication:

Multiplex and CAN communication systems diagnostics (if applicable to this year/model).

Procedures Included

Maintenance:

Regular scheduled maintenance, fluid checks, filter replacements.

Diagnostics:

Troubleshooting guides, fault code interpretation, diagnostic procedures.

Repair:

Step-by-step repair instructions for all covered systems.

Rebuilds:

Complete engine, transmission, and major component rebuild procedures.

Specifications:

Torque specifications, clearances, fluid capacities, electrical values.

Wiring Schematics:

Detailed factory wiring diagrams for all electrical systems.

Illustrations Diagrams:

High-quality illustrations, exploded views, and diagrams for clarity.

Technical Depth

Depth:

Factory level technical depth, covering everything from basic maintenance to advanced diagnostics and complete overhauls.

📊 Manual Specifications

File Format

File Type:

Compatibility:

Windows (Vista 32/64, XP, ME, 98, NT, 2000) and Mac compatible.

Requirements:

Adobe PDF Reader and WinZip (free online).

Print Quality

Printability:

All pages are printable.

Image Scaling:

Images and diagrams can be blown up and printed in enlarged copies.

Binding Type

Binding:

Digital (PDF) - No physical binding.

Paper Type

Paper Type:

N/A (Digital format).

⚙️ Engine Specifications

Primary Engine

Engine Code Typical:

M116 (4.2L V8) or M117 (5.0L V8) - common for W126 SEL models.

Engine Code Typical

Displacement Typical:

4196 cc (4.2L) or 4973 cc (5.0L)

Performance

Horsepower Typical:

Approx. 200-240 hp (depending on specific engine variant and market).

Torque Typical:

Approx. 240-290 lb-ft (depending on specific engine variant and market).

Fuel System

Fuel Injection Type:

Bosch K-Jetronic or KE-Jetronic (CIS-E) fuel injection.

Fuel Type:

Premium Unleaded Gasoline

🔧 Transmission

Standard

Transmission Type:

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

Optional

Optional Transmission:

Manual transmission was generally not offered on SEL models.

Features

Transmission Fluid Spec:

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

📐 Dimensions

Exterior

Wheelbase In:

121.1 inches (3075 mm)

Overall Length In:

201.1 inches (5108 mm)

Weights

Curb Weight Lbs Typical:

Approx. 4,000-4,300 lbs (1814-1950 kg)

🛡️ Safety Features

Ratings

Safety Standard:

Designed to meet contemporary safety standards of the era.

Active Features

Active Safety Features:

Anti-lock Braking System (ABS), power-assisted steering.

Passive Features

Passive Safety Features:

Reinforced safety cage, crumple zones, driver and front passenger airbags (often optional or standard depending on market and date of manufacture within 1991), seatbelt pretensioners.

💡 Technology Features

Infotainment

Audio System:

Factory premium audio systems (e.g., Becker units), often with cassette player. Optional CD changer might be available.

Driver Assistance

Driver Assistance Features:

ABS, Cruise Control. Limited electronic driver aids compared to modern vehicles.

Connectivity

Connectivity Features:

Basic analog connectivity for power windows, locks, mirrors, and climate control. No digital network connectivity like CAN bus in the modern sense.

🔧 Maintenance

Service Intervals

Oil Change Interval Typical:

Every 5,000-10,000 miles or 12 months, whichever comes first (check manual for specific recommendation).

Major Service Intervals Typical:

Major services typically recommended at 30,000, 60,000, 90,000 miles, etc.

Fluid Specifications

Engine Oil Spec:

Mobil 1 15W-50 synthetic or equivalent (API SG classification, MB-Approval 229.1 for later specs, or equivalent for the period).

Coolant Spec:

Mercedes-Benz approved coolant (e.g., G05, or equivalent silicate-free coolant).

Brake Fluid Spec:

DOT 3 or DOT 4 brake fluid.

Known Issues

Typical Issues:

Component wear (e.g., fuel distributors, idle control valves, blower motor resistors), vacuum hose leaks, wiring harness deterioration, headliner sagging, potential for rust in certain areas.

📚 Vehicle History

Brand Heritage

Brand Philosophy:

Mercedes-Benz known for engineering excellence, durability, and luxury.

Model Evolution

W126 Introduction:

The W126 S-Class was introduced in 1979 as the successor to the W116.

W126 Facelift:

Received a significant facelift in 1985, introducing updated styling, improved aerodynamics, and enhanced features, which this 1991 model represents.

Sel Designation:

The 'SEL' designation signifies the long-wheelbase version, providing increased rear legroom and a more luxurious passenger experience.

Production

Production Years:

W126 production ran from 1979 to 1991.

🏆 Awards & Recognition

Recognitions

General Recognition:

The W126 S-Class is widely regarded as one of the finest sedans of its era, celebrated for its build quality, comfort, and durability.