1990 Mercedes W126 SE Service and Repair Manual

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🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 SE Year: 1990 Codes Chassis Code: W126 👋 Introduction Market Position Target Audience: Mercedes-Benz W126 SE owners, DIY enthusiasts, independent repair shops...

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Taper: Car

Distributeur:

UGS: 459767

Mots clés: 1990 Car Cars Featured Mercedes W126 W126 SE

Variantes de produits

Description

🏷️ Basic Information

Identification

Make:

Mercedes-Benz

Model:

W126 SE

Year:

Codes

Chassis Code:

👋 Introduction

Market Position

Target Audience:

Mercedes-Benz W126 SE owners, DIY enthusiasts, independent repair shops

Key Features

Authenticity:

Exact same manual used by dealership technicians

Completeness:

Covers all models and all repairs A-Z

Usability:

Digital PDF format for easy access, printing, and storage; eliminates need for greasy physical manuals

Content Quality:

Vehicle-specific, not generic; includes step-by-step instructions, diagrams, illustrations, wiring schematics, and specifications

📋 Manual Details

Coverage Areas

General:

Complete Service and Repair for 1990 Mercedes-Benz W126 SE

Page Count

Estimated:

Extensive (Exact count not provided, but described as 'everything you will ever need' and 'complete step-by-step instructions')

Manual Type

Primary:

Factory Service and Repair Manual

Language

Primary:

English

Format

Digital:

📖 Manual Coverage

Systems Covered

Engine Mechanical:

Complete engine overhaul, diagnostics, repair, and specifications

Engine Control System:

Engine management, fuel injection, ignition system, diagnostics

Fuel System:

Fuel delivery, injectors, pumps, lines, fuel tank service

Emission Control:

Emission system components, diagnosis, and repair

Intake Exhaust Cooling:

Cooling system, radiators, hoses, thermostats, exhaust systems

Lube System:

Lubrication system, oil pump, oil filter, oil specifications

Ignition Starting Charging:

Ignition system, starter motor, alternator, battery systems

Automatic Transmission:

Automatic transmission service, overhaul, diagnostics, fluid specifications

Manual Transmission:

Manual transmission service, overhaul, diagnostics, fluid specifications (if applicable to SE model)

Drivetrain:

Driveshaft, propeller shaft, differential, axle components

Suspension:

Front and rear suspension components, diagnosis, and repair

Wheels Tires:

Tire specifications, wheel alignment, balancing

Brake Control:

Brake system hydraulics, ABS (if equipped), diagnostics

Brakes:

Brake pad replacement, rotor service, caliper repair

Parking Brake:

Parking brake system inspection, adjustment, and repair

Steering Column:

Steering column components, ignition switch service

Power Steering:

Power steering system diagnosis, pump, rack and pinion service

Air Conditioning:

HVAC system, refrigerant handling, component service

Supplemental Restraint System:

SRS system components, airbag service (with safety precautions)

Seat Belts:

Seat belt system inspection and repair

Engine Immobilizer:

Immobilizer system (if equipped) diagnosis and service

Cruise Control:

Cruise control system diagnosis and repair

Wiper Washer:

Wiper and washer system components and repair

Door Locks:

Door lock mechanisms, central locking system service

Instrument Panel Gauges:

Instrument cluster, gauges, warning lights diagnosis and repair

Seats:

Seat adjustment mechanisms, power seat systems

Doors Hood Body:

Engine hood, doors, exterior and interior trim service

Electrical Systems:

Complete vehicle electrical system troubleshooting, component repair

Multiplex Can Communication:

Information on vehicle communication networks (if applicable to the 1990 W126 model's complexity)

Procedures Included

Maintenance:

Routine maintenance, scheduled servicing, fluid changes, filter replacements

Diagnostics:

Troubleshooting guides, fault code interpretation, symptom-based diagnosis

Repair:

Detailed step-by-step repair procedures for all covered systems

Rebuilding:

Engine and transmission rebuilding procedures

Overhaul:

Complete overhaul procedures for major components

Installation:

Component installation and replacement instructions

Adjustment:

Precise adjustment procedures for various systems

Technical Depth

Scope:

Comprehensive, from basic maintenance to advanced diagnostics and complete rebuilds

Detail Level:

Factory-level detail with step-by-step instructions, diagrams, illustrations, and wiring schematics

📊 Manual Specifications

File Format

Type:

Searchable:

Implied by digital format, but not explicitly stated as text-searchable.

Print Quality

Reproducibility:

High, pages are printable and can be enlarged

Binding Type

Physical:

N/A (Digital PDF)

Paper Type

Physical:

N/A (Digital PDF)

Software Requirements

Reader:

Adobe PDF Reader

Decompression:

Winzip (or similar ZIP utility)

Compatibility

Operating Systems:

Windows Vista (32/64-bit), XP, ME, 98, NT, 2000, and Mac

⚙️ Engine Specifications

Primary Engine

Engine Type:

Likely M103 Inline-6 (2.6L or 3.0L) or M117 V8 (4.2L or 5.0L) for a 1990 W126 SE. Specific engine variant not explicitly stated, but SE typically refers to the standard wheelbase sedan.

Performance

Horsepower:

Varies by specific engine. M103 3.0L approximately 180-190 hp. M117 4.2L approximately 180-200 hp. M117 5.0L approximately 240 hp.

Torque:

Varies by specific engine. M103 3.0L approximately 185-195 lb-ft. M117 4.2L approximately 210-225 lb-ft. M117 5.0L approximately 275-300 lb-ft.

Fuel System

Injection Type:

Bosch KE-Jetronic (CIS-E) or later variants of electronic fuel injection depending on specific engine code.

🔧 Transmission

Standard

Type:

4-speed automatic transmission (e.g., 722.4 or 722.3)

Optional

Type:

Manual transmission was not commonly offered on the SE model for the US market, but might have been available elsewhere or in specific configurations.

Features

Fluid Type:

Dexron III or equivalent ATF (refer to specific manual for exact MB specification number, e.g., MB 236.1)

📐 Dimensions

Exterior

Length:

Approx. 196.4 inches (5000 mm) for standard wheelbase sedan

Width:

Approx. 70.5 inches (1790 mm)

Height:

Approx. 55.1 inches (1400 mm)

Weights

Curb Weight:

Approx. 3,700 - 4,100 lbs (1680 - 1860 kg) depending on engine and options

🛡️ Safety Features

Ratings

Crash Test Results:

While specific NHTSA/IIHS ratings for 1990 may be limited, the W126 was engineered with a focus on occupant safety for its era, featuring a strong unibody structure and designed crumple zones.

Active Features

Anti-lock Braking System (ABS) was standard or optional depending on market and specific model year.

Passive Features

Airbags:

Driver airbag was becoming standard on luxury vehicles in this era, likely optional or standard on the 1990 SE. Passenger airbag availability may vary.

Seat Belts:

Three-point inertia-reel seat belts for all occupants.

💡 Technology Features

Infotainment

Audio System:

Factory-installed premium audio systems were available, often with cassette players. Radio reception and speaker quality might be dated by modern standards.

Driver Assistance

Cruise Control:

Standard electronic cruise control system.

Connectivity

Bluetooth Usb:

Not available on original factory equipment.

🔧 Maintenance

Service Intervals

Oil Change:

Typically every 7,500 - 10,000 miles (12,000 - 16,000 km) or annually, whichever comes first. Refer to manual for precise intervals.

Major Service:

Major service intervals often around 30,000 miles (48,000 km) or 50,000 miles (80,000 km) for comprehensive checks and replacements (e.g., spark plugs, transmission service, coolant).

Fluid Specifications

Engine Oil:

SAE 5W-30, 5W-40, or 10W-40 synthetic or semi-synthetic oil meeting MB 229.1 or MB 229.3 specifications (check manual for precise viscosity and spec).

Coolant:

Ethylene glycol-based antifreeze, typically a 50/50 mix with distilled water, meeting MB-Approval 325.0 (e.g., Mercedes-Benz Premium Coolant).

Brake Fluid:

DOT 3 or DOT 4 brake fluid meeting MB-Approval 331.0.

Known Issues

Wiring Harness:

Degradation of insulation on certain wiring harnesses is a known issue with older Mercedes-Benz vehicles due to material aging.

Cooling System:

Plastic components in the cooling system (e.g., expansion tank, thermostat housing) can become brittle and leak over time.

Fuel System:

OMEGA fuel pressure regulators and aging fuel lines can be sources of leaks or performance issues.

Headliner:

Saggy headliner due to adhesive failure is a common interior cosmetic issue.

📚 Vehicle History

Brand Heritage

Legacy:

Mercedes-Benz has a long-standing reputation for engineering excellence, safety, and luxury vehicle manufacturing, with the S-Class (W126) being a pinnacle of this reputation in the late 20th century.

Model Evolution

Generation:

The W126 chassis was produced from 1979 to 1991, representing the second generation of the S-Class. The 1990 model year falls towards the end of its production lifecycle, often featuring minor updates and refinements.

Production

Manufacturing Location:

Sindelfingen, Germany

🏆 Awards & Recognition

Recognitions

Industry Acclaim:

The W126 S-Class was widely praised for its luxury, comfort, engineering, and safety, often regarded as one of the finest sedans of its era and a benchmark for automotive design and build quality.