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1991 Mercedes W126 SE Service and Repair Manual
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🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 SE Year: 1991 Codes Chassis Code: W126 Generation Generation Name: Second Generation S-Class Generation Years: 1979-1991 👋 Introduction Market Position Target Audience:...
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🏷️ Basic Information
Identification
Make:
Mercedes-Benz
Model:
W126 SE
Year:
1991
Codes
Chassis Code:
W126
Generation
Generation Name:
Second Generation S-Class
Generation Years:
1979-1991
👋 Introduction
Market Position
Target Audience:
Mercedes-Benz W126 owners, DIY enthusiasts, independent repair shops
Value Proposition:
Provides dealership-level repair and maintenance information for DIY use, saving time and money.
Competitive Analysis
Differentiation:
Vehicle-specific, not generic. Exact same information used by dealership technicians.
Key Features
Feature 1:
Comprehensive step-by-step instructions
Feature 2:
Detailed diagrams and illustrations
Feature 3:
Accurate wiring schematics
Feature 4:
Vehicle-specific technical specifications
Feature 5:
Digital format for easy access and printing
📋 Manual Details
Coverage Areas
Primary Coverage:
Service, Repair, Maintenance, Diagnostics
Model Variants Covered:
SE (Standard Wheelbase Sedan)
Repair Scope:
A-Z (All Repairs)
Page Count
Estimated Pages:
Extensive (Likely 1000+ pages based on depth)
Manual Type
Type:
Factory Service Manual / Repair Manual
Language
Language:
English
Format
Digital Format:
PDF
📖 Manual Coverage
Systems Covered
Engine:
Complete engine mechanicals, cooling system, lubrication system, fuel system, ignition system, emissions control system
Control System:
Engine Control Unit (ECU) diagnostics and parameters
Mechanical:
General mechanical repairs and adjustments
Fuel Service:
Fuel delivery, injection systems, fuel tank and lines, specifications
Emission Control:
Exhaust systems, catalytic converters, emission control devices and diagnostics
Intake Exhaust Cooling:
Intake manifolds, exhaust manifolds, radiators, water pumps, thermostats, hoses
Lube:
Lubrication system components, oil filters, oil pump, specifications
Ignition Starting Charging:
Spark plugs, ignition coils, distributor (if applicable), starter motor, alternator, battery, charging system diagnostics
Auto Transmission:
Automatic transmission service, repair, fluid specifications, internal components, shift control
Manual Transmission:
Manual transmission service, repair, fluid specifications, internal components (if applicable to SE model)
Drive Shaft Differential:
Driveshaft, universal joints, differential service, fluid specifications
Axle Suspension:
Front and rear suspension components, shock absorbers, springs, control arms, bushings, wheel bearings
Tire Wheel:
Tire pressure specifications, wheel alignment, wheel balancing, lug nut torque
Brake Control:
Brake system hydraulics, ABS (Anti-lock Braking System) components and diagnostics, brake fluid specifications
Brake:
Brake pads, rotors, calipers, brake lines, bleeding procedures
Steering Column:
Steering column assembly, tilt and telescope mechanisms, ignition lock cylinder
Power Steering:
Power steering pump, reservoir, hoses, steering gear, fluid specifications
Air Condition:
HVAC system components, refrigerant, compressor, evaporator, condenser, controls, diagnostic procedures
Supplemental Restraint:
Airbag system components, SRS warning light diagnostics, seat belt pre-tensioners
Seat Belt:
Seat belt mechanisms, pretensioners, safety regulations
Engine Immobilizer:
Immobilizer system components and operation (if equipped)
Cruise Control:
Cruise control system operation, components, and diagnostics
Wiper Washer:
Wiper motor, blades, washer pump, fluid reservoir, linkages
Door Lock:
Door lock mechanisms, central locking system, vacuum boosters (if applicable)
Meter Audio Visual:
Instrument cluster components, gauges, audio system integration, speaker wiring
Horn:
Horn operation, wiring, and relay
Windshield Glass Mirror:
Windshield replacement, glass care, mirror adjustments and components
Instrument Panel:
Instrument panel removal and installation, lighting, gauge calibration
Seat:
Seat adjustments, heating elements (if equipped), upholstery care
Engine Hood Door:
Hood and door latch mechanisms, hinges, seals, alignment
Exterior Interior:
Body panel repair, trim, weatherstripping, interior trim panel removal
Electrical:
Complete vehicle electrical system, including power distribution, lighting, accessories, fuses, relays
Multiplex Can Communication:
Multiplex wiring systems, CAN communication protocols (if applicable to this year/model)
Procedures Included
Maintenance Procedures:
Scheduled maintenance, fluid changes, filter replacements, lubrication
Diagnostic Procedures:
Troubleshooting guides, symptom-based diagnostics, fault code interpretation
Repair Procedures:
Step-by-step repair instructions for all covered systems, including disassembly, reassembly, and adjustment
Component Replacement:
Detailed instructions for replacing major and minor components
Wiring Schematics:
Comprehensive electrical wiring diagrams for all vehicle systems
Technical Depth
Depth:
Factory level, comprehensive, from basic maintenance to complete engine and transmission rebuilds
Detail Level:
High detail with step-by-step instructions, diagrams, illustrations, and specifications
📊 Manual Specifications
File Format
Compatibility:
Windows (Vista 32/64, XP, ME, 98, NT, 2000) and Mac
Reader Requirement:
Adobe PDF Reader (Free)
Extraction Requirement:
Winzip (Free)
Print Quality
Printability:
Fully Printable
Image Scaling:
Blow-up images for enlarged printing
Binding Type
Binding:
N/A (Digital PDF)
Paper Type
Paper Type:
N/A (Digital PDF)
⚙️ Engine Specifications
Primary Engine
Engine Type:
Inline-6 or V8 (specific engine variant for 1991 SE needs confirmation, commonly M103 or M116/M117)
Performance
Fuel System Type:
Bosch K-Jetronic or KE-Jetronic Fuel Injection (depending on specific engine)
Fuel System
Fuel Type:
Unleaded Gasoline
🔧 Transmission
Standard
Transmission Type:
4-speed automatic (common for SE models)
Optional
Transmission Options:
5-speed manual (less common for SE, more for SEC)
Features
Automatic Transmission Control:
Hydraulic control, potentially with electronic assists for later models.
📐 Dimensions
Exterior
Wheelbase:
Approx. 2935 mm (115.6 inches) for SE (Standard Wheelbase)
Weights
Curb Weight:
Varies by engine, approx. 1700-1850 kg (3750-4080 lbs)
🛡️ Safety Features
Ratings
Safety Standards:
Designed to meet 1990s automotive safety standards, featuring crumple zones and reinforced safety cage.
Active Features
ABS:
Anti-lock Braking System (standard on most models).
Passive Features
Airbags:
Driver airbag standard, passenger airbag optional/later standard depending on market.
💡 Technology Features
Infotainment
Audio System:
Factory premium sound systems, often with cassette player and external amplifier.
Driver Assistance
Cruise Control Type:
Electronic cruise control.
🔧 Maintenance
Service Intervals
Oil Change Interval:
Typically every 7,500 to 10,000 miles or 12 months, depending on driving conditions and oil type.
Major Service Interval:
Various intervals for spark plug replacement, transmission fluid, differential fluid, coolant, brake fluid (e.g., 30,000-60,000 miles for major services).
Fluid Specifications
Engine Oil Specification:
MB 229.1 or MB 228.3 (e.g., 10W-40, 15W-40 depending on climate and specific engine). Manual will specify exact grade.
Transmission Fluid Specification:
Dexron III or equivalent approved by Mercedes-Benz (e.g., MB 236.1).
Coolant Specification:
Ethylene glycol based antifreeze with corrosion inhibitors, typically a 50/50 mix with distilled water.
Known Issues
Common Problems:
Vacuum system leaks (affecting door locks, central locking, climate control), SRS system faults, fuel distributor issues (K-Jetronic), suspension bushings wear, window regulator failures, rust on specific body areas.
📚 Vehicle History
Brand Heritage
Brand Reputation:
Mercedes-Benz renowned for engineering, build quality, comfort, and safety.
Model Evolution
W126 Development:
Successor to the W116, introduced in 1979. The 1991 model year represents the final production year of this highly successful generation.
Production
Production Period:
1979-1991
🏆 Awards & Recognition
Recognitions
Historical Recognition:
The W126 chassis was widely acclaimed as one of the best luxury sedans of its era, known for its robustness and sophisticated engineering.