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Mercedes Benz

Mercedes Benz 260 280 300 350 380 420 500 560 W126 1981-1991 Full Service & Repair Manual

Mercedes Benz 260 280 300 350 380 420 500 560 W126 1981-1991 Full Service & Repair Manual

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Vehicle data plateRef 160395
Brand
Mercedes Benz
Vehicle
Car
Models covered
260, 280, 300, 350, 380, 420, 500, 560, EBOOK, Mercedes, W126
Years
1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991
Format
PDF, searchable, print-ready
Delivery
Instant download after checkout
Language
English

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🏷️ Basic Information
Identification
Make:
Mercedes-Benz
Model:
W126 S-Class
Product Name:
Mercedes Benz 260 280 300 350 380 420 500 560 W126 1981-1991 Full Service & Repair Manual
Covered Models:
260 SE, 280 SE, 300 SE, 300 SDL, 350 SD, 350 SDL, 380 SE, 380 SEL, 420 SE, 420 SEL, 500 SE, 500 SEL, 560 SE, 560 SEL, 560 SEC
Codes
Chassis Code:
W126
👋 Introduction
Market Position
Segment:
Full-size Luxury Sedan/Coupe
Target Audience:
Owners of W126 Mercedes-Benz vehicles seeking to perform their own maintenance and repairs, professional independent mechanics.
Competitive Analysis
Competitors 1980S:
BMW 7 Series (E23), Audi V8, Cadillac DeVille/Fleetwood, Lincoln Continental.
Key Features
Manual Value Proposition:
Provides the same level of detail and accuracy as official Mercedes-Benz factory manuals, enabling professional-level service and repair.
Visuals:
Includes hundreds of detailed photos, diagrams, and exploded views.
📋 Manual Details
Coverage Areas
Primary Coverage:
North America, Europe, Global Markets
Page Count
Estimated Pages:
Hundreds (specific count not provided, but described as extensive)
Manual Type
Type:
Factory Service Repair Workshop Manual
Language
Language:
English
Format
Format:
Downloadable PDF
📖 Manual Coverage
Systems Covered
Engine Mechanical:
Detailed overhaul, assembly, and troubleshooting for all W126 engine variants (M103, M110, M116, M117, OM603).
Engine Electrical:
Ignition systems, fuel injection systems (Bosch KE-Jetronic, K-Jetronic, EDC for diesels), engine control units (ECU), sensors, wiring diagrams.
Transmission Manual:
Overhaul, adjustment, and troubleshooting for all manual transmissions used in the W126.
Transmission Automatic:
Detailed procedures for servicing, repair, and troubleshooting of the 722.3, 722.4, and 722.5 automatic transmissions.
Suspension Steering:
Front and rear suspension systems, hydraulic self-leveling suspension (SLS) for some models, steering gearbox, power steering system.
Brakes:
Hydraulic brake system, ABS (Anti-lock Braking System) diagnosis and repair, brake pad/rotor replacement, brake bleeding, parking brake.
Electrical System:
Complete electrical system coverage including lighting, power windows, sunroof, central locking, climate control, dashboard instruments, wiring diagrams for all circuits.
Body And Chassis:
Body panel repair, door and latch mechanisms, convertible top operation (for SEC models with sunroof), interior trim, underbody corrosion protection.
Climate Control:
Air conditioning system service, diagnosis, refrigerant handling, heater core replacement, climate control module operation.
Procedures Included
Scheduled Maintenance:
Routine service checks, oil changes, filter replacements, spark plug replacement, tune-up procedures.
Troubleshooting:
Systematic diagnostic procedures for common and uncommon faults across all vehicle systems.
Repair And Rebuild:
Detailed step-by-step instructions for component removal, overhaul, and reinstallation, from minor repairs to major engine and transmission rebuilds.
Component Replacement:
Instructions for replacing specific parts like alternators, starters, fuel pumps, radiators, brake calipers, etc.
Diagnostic Codes:
Explanation and interpretation of diagnostic trouble codes (DTCs) where applicable, particularly for engine management systems.
Technical Depth
Depth:
Comprehensive (from basic maintenance to complete engine and transmission rebuilds, including electrical system diagnostics).
📊 Manual Specifications
File Format
Format:
PDF
Print Quality
Printability:
Printable (single pages or entire manual)
Binding Type
Binding:
N/A (Digital Download)
Paper Type
Paper Type:
N/A (Digital Download)
Searchability
Search Functionality:
Likely searchable PDF content (standard for professional manuals).
Access
Access Method:
Instant download, usable on multiple devices (computer, tablet, smartphone).
Licensing
License:
Lifetime usage, no expiry, no renewal fees.
⚙️ Engine Specifications
Primary Engine
260 Se (M103.941):
2.6L Inline-6, 160 hp @ 5800 rpm, 177 lb-ft @ 4250 rpm
280 Se/Sel (M110.984/985):
2.8L Inline-6, 185 hp @ 5800 rpm, 181 lb-ft @ 4250 rpm
300 Se/Sel (M103.980/982):
3.0L Inline-6, 188 hp @ 5700 rpm, 195 lb-ft @ 4400 rpm
300 Sdl (Om603.961):
3.0L Inline-5 Turbo Diesel, 148 hp @ 4400 rpm, 221 lb-ft @ 2400 rpm
350 Sd/Sdl (Om603.970/971):
3.5L Inline-5 Turbo Diesel (some markets), 136 hp, 207 lb-ft
380 Se/Sel (M116.962/963):
3.8L V8, 155 hp @ 4750 rpm, 200 lb-ft @ 2500 rpm
420 Se/Sel (M116.964/967):
4.2L V8, 180 hp @ 4700 rpm, 220 lb-ft @ 3000 rpm
500 Se/Sel (M117.963/968):
5.0L V8, 177 hp @ 4000 rpm, 240 lb-ft @ 2500 rpm (US Spec)
560 Se/Sel/Sec (M117.967/968/970):
5.6L V8, 238 hp @ 4750 rpm, 317 lb-ft @ 3250 rpm (US Spec)
Fuel System
Injection Type:
Bosch K-Jetronic (CIS), KE-Jetronic (CIS-E), Bosch EDC (Diesel) for various models.
Ignition
System:
Electronic Ignition (CDI - Capacitor Discharge Ignition) for petrol engines.
🔧 Transmission
Standard
Transmission Types:
4-speed Automatic (722.3/722.4), 5-speed Automatic (722.5), 4-speed Manual (less common in US).
Optional
Optional Transmissions:
5-speed manual available on some European models.
Features
Torque Converter Lockup:
Lock-up torque converter in 4-speed and 5-speed automatics for improved efficiency.
Fluid Specs
Automatic Transmission Fluid:
MB 236.6 (e.g., Mobil ATF 220, Pentosin ATF 1).
Manual Transmission Fluid:
MB 235.0 (e.g., SAE 80W/90 gear oil).
📐 Dimensions
Exterior
Length:
Approximately 197.9-200.2 inches (4-door sedan).
Width:
Approximately 70.5 inches.
Height:
Approximately 56.0 inches.
Wheelbase
Wheelbase:
116.1 inches (standard wheelbase).
Weights
Curb Weight:
Approximately 3,500 - 4,200 lbs depending on engine and options.
🛡️ Safety Features
Ratings
NHTSA Ratings:
While NHTSA ratings from this era are less comprehensive, the W126 was engineered with a strong emphasis on passive safety for its time.
Active Features
ABS:
Standard or optional depending on model year and market; Bosch ABS system.
Passive Features
Airbags:
Driver's side airbag introduced as an option in later years (late 1980s), becoming more common on higher trims.
Crumple Zones:
Advanced front and rear crumple zones designed for energy absorption.
Seatbelts:
Pre-tensioned front seatbelts in later models.
💡 Technology Features
Infotainment
Audio System:
Original Becker or Blaupunkt radio/cassette systems, often with optional amplifier and multiple speakers.
Navigation:
Optional early navigation systems were available in some markets towards the end of the W126's production, but not widespread.
Driver Assistance
Cruise Control:
Standard feature on most models.
Vacuum Door Locks:
Central locking system operated via vacuum.
Connectivity
Antenna System:
Power antenna for radio reception.
🔧 Maintenance
Service Intervals
Oil Change:
Typically every 5,000-7,500 miles or 6-12 months, depending on driving conditions and oil used.
Major Service:
Around 30,000, 60,000, 90,000 miles, involving inspection and replacement of various fluids, filters, spark plugs, belts, and hoses.
Fluid Specifications
Engine Oil Petrol:
MB 229.1 or 229.3 compliant, typically 15W-40 or 20W-50 depending on climate (consult specific model year for exact spec).
Engine Oil Diesel:
MB 228.1 or 228.3 compliant, typically 15W-40 diesel engine oil.
Coolant:
MB 325.0 (Ethylene Glycol based, green color).
Brake Fluid:
DOT 3 or DOT 4.
Known Issues
Wiring Harness Degradation:
Biodegradable insulation on engine wiring harnesses can become brittle and fail, especially in the engine bay.
Fuel System Leaks:
Aging rubber fuel lines and seals can degrade, leading to leaks.
Hydropneumatic Suspension Leaks:
Self-leveling suspension (SLS) accumulators and lines can develop leaks, causing the rear end to sag.
Climate Control Actuators:
Vacuum-operated actuators for HVAC system can fail, leading to improper airflow or temperature control.
Mass Air Flow Sensor:
The air flow meter (for K-Jetronic) can become dirty or fail, affecting fuel delivery and engine performance.
Transmission Behavior:
Early automatic transmissions can exhibit rough shifting or delayed engagement due to worn solenoids or fluid issues.
📚 Vehicle History
Brand Heritage
Mercedes Benz Legacy:
Mercedes-Benz's long-standing reputation for engineering excellence, safety, and luxury.
Model Evolution
W126 Introduction:
Introduced in 1979 as the successor to the W116, it was a significant step forward in design, aerodynamics, and safety technology.
Mid-Cycle Refresh:
Received a significant facelift and technical update in 1985, introducing new engines (M103, M117 5.6L), revised aerodynamics, and updated interior features. Diesel models also saw updates.
Production
Production Years:
1979-1991
Production Locations
Manufacturing Plants:
Sindelfingen, Germany; various assembly plants globally.
🏆 Awards & Recognition
Recognitions
Car And Driver 10Best:
The W126 S-Class was frequently named to Car and Driver's 10Best list throughout its production run.
Motor Trend Car Of The Year:
While not explicitly winning 'Car of the Year', its consistent critical acclaim cemented its status as a benchmark luxury car.
Certifications
Engineering Acclaim:
Widely recognized for its advanced engineering, comfort, and build quality of its era.

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