Mercedes-Benz Model 126 Service Repair Manual

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🏷️ Basic Information Identification Make: Mercedes-Benz Model: W126 Product Name: Mercedes-Benz W126 Service Repair Manual Codes Chassis Code: W126 👋 Introduction Market Position Segment: Full-size Luxury Sedan/Coupe Target Audience: Affluent...

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Description

🏷️ Basic Information

Identification

Make:

Mercedes-Benz

Model:

Product Name:

Mercedes-Benz W126 Service Repair Manual

Codes

Chassis Code:

👋 Introduction

Market Position

Segment:

Full-size Luxury Sedan/Coupe

Target Audience:

Affluent consumers seeking comfort, safety, and prestige.

Competitive Analysis

Key Competitors:

BMW 7 Series, Audi V8, Cadillac DeVille, Lincoln Town Car.

Key Features

Design Philosophy:

Elegance, refinement, advanced engineering, and superior build quality characteristic of Mercedes-Benz.

Innovations:

Early adoption of SRS airbags, ABS, and advanced safety features for its era.

📋 Manual Details

Coverage Areas

Coverage Scope:

Comprehensive workshop repair and service procedures

Page Count

Estimated Page Count:

Varies by specific model/year subset, but typically 2000+ pages for a complete set.

Manual Type

Type:

Workshop Service Manual / Repair Manual

Language

Language:

English (Primary), often available in German, French, etc. depending on original factory source.

Format

Format:

PDF (as described in product information)

📖 Manual Coverage

Systems Covered

Engine Mechanical:

Engine assembly, disassembly, overhaul, tuning, lubrication, cooling system, fuel system (carburetor & fuel injection).

Engine Management:

Engine control units (ECU), ignition systems, emissions control systems, sensor diagnostics.

Transmission Manual:

Manual gearbox operation, overhaul, clutch system, driveshafts, rear axle.

Transmission Automatic:

Automatic transmission (e.g., 722.3, 722.4, 722.5) operation, overhaul, hydraulic systems, torque converter.

Brakes:

Hydraulic system, ABS (Anti-lock Braking System) components and diagnostics, brake pad/disc replacement, caliper overhaul, parking brake.

Suspension:

Front and rear suspension components, shock absorbers, springs, bushings, alignment specifications, self-leveling suspension (if equipped).

Steering:

Power steering system, steering gear, linkages, steering column, steering wheel.

Electrical System:

Battery, charging system (alternator), starter motor, lighting systems (headlamps, taillamps, interior), instrumentation, wiring diagrams.

Body And Chassis:

Body panels, doors, hood, trunk, glass, interior trim, chassis frame, rust prevention, body repairs.

HVAC:

Heating, ventilation, and air conditioning (HVAC) system, climate control, refrigerant handling, blower motor, compressor.

Fuel System:

Fuel tank, fuel pump, fuel lines, fuel injectors (for fuel-injected models), fuel filters.

Exhaust System:

Exhaust manifold, catalytic converter, muffler, exhaust pipes, oxygen sensors.

Wheels And Tires:

Wheel specifications, tire sizes, pressure recommendations, mounting procedures.

Procedures Included

Preventative Maintenance:

Scheduled maintenance tasks, lubrication points, fluid changes, filter replacements.

Troubleshooting:

Diagnostic procedures for common problems, fault finding charts, symptom-based troubleshooting.

Repair And Overhaul:

Step-by-step instructions for component removal, disassembly, repair, assembly, and installation.

Engine Overhaul:

Complete engine rebuild procedures, including piston rings, bearings, valve seats, camshafts.

Transmission Rebuild:

Detailed steps for rebuilding both manual and automatic transmissions.

Brake System Repair:

Bleeding procedures, caliper replacement, master cylinder overhaul, ABS module diagnostics.

Electrical Diagnostics:

Testing circuits, diagnosing electrical faults, using multimeter and oscilloscopes, wiring harness repair.

Body Repair:

Panel replacement, dent repair, rust remediation, glass replacement.

HVAC Service:

Refrigerant recharging, leak detection, component replacement (compressor, evaporator, condenser).

Technical Depth

Depth:

In-depth, professional-level coverage suitable for experienced technicians and serious DIY enthusiasts.

Diagrams:

Detailed step-by-step diagrams, exploded views, and troubleshooting flowcharts.

Specifications:

Includes torque specifications, clearances, timing marks, electrical resistance values, fluid capacities, and diagnostic data.

📊 Manual Specifications

File Format

File Type:

Print Quality

Quality:

High-resolution scans, enabling clear viewing and printing of text and diagrams.

Binding Type

Binding:

N/A (Digital PDF format)

Paper Type

Paper Quality:

N/A (Digital PDF format)

⚙️ Engine Specifications

Primary Engine

Engine Displacement Range:

2.8L (170 cu in) to 5.6L (340 cu in) - M103, M110, M116, M117 inline-6 and V8 engines.

Performance

Horsepower Range:

Approx. 140 hp (2.8L) to 270 hp (5.6L) depending on variant and market.

Torque Range:

Approx. 200 Nm (148 lb-ft) to 450 Nm (332 lb-ft).

Fuel System

Injection Systems:

Bosch K-Jetronic (CIS), KE-Jetronic (CIS-E), and later Electronic Fuel Injection (EFI) depending on model and year.

Engine Code Examples

Example Codes:

M103.980 (3.0L I6), M117.962 (5.0L V8), M116.962 (3.8L V8).

🔧 Transmission

Standard

Standard Transmission:

4-speed automatic (e.g., 722.3) was most common. Manual transmissions were rare in most markets, often a 5-speed.

Optional

Optional Transmission:

5-speed manual transmission (e.g., G3/27) was available on some base models, notably in Europe. Later models offered a 4-speed automatic with electronic control (722.4) and a 5-speed automatic (722.5).

Features

Automatic Features:

Lock-up torque converter, often offered with a sport/economy mode selector.

📐 Dimensions

Exterior

Wheelbase:

2,935 mm (115.6 in)

Length:

4,965 mm (195.5 in) for Sedan, 5,010 mm (197.2 in) for SEL (long wheelbase)

Width:

1,790 mm (70.5 in)

Height:

1,420 mm (55.9 in) for Sedan, 1,412 mm (55.6 in) for SEL

Weights

Curb Weight Range:

Approx. 1,600 kg (3,527 lbs) to 1,900 kg (4,189 lbs)

🛡️ Safety Features

Ratings

Crash Test Results:

No standardized crash test ratings like modern NHTSA/Euro NCAP. However, known for robust construction and excellent passive safety for its era.

Active Features

Standard on most models from mid-production onwards. Anti-lock Braking System.

Traction Control:

Optional (ASR - Acceleration Slip Regulation) on later models, particularly V8 variants.

Passive Features

Airbags:

Driver's SRS airbag became standard in 1985. Passenger airbag optional on later models.

Seatbelts:

Three-point inertia-reel seatbelts front and rear.

Structure:

Reinforced safety cage, energy-absorbing crumple zones.

💡 Technology Features

Infotainment

Audio System:

Factory-installed Becker radios, often with cassette players. Some later models offered premium sound systems.

Driver Assistance

Cruise Control:

Standard on most models. Mechanical or vacuum-actuated.

Climate Control:

Optional automatic climate control (Thermotronic) on higher-end models.

Connectivity

Original Connectivity:

Limited to factory radio antenna and basic speaker connections. No modern connectivity features like Bluetooth or USB.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Typically every 10,000 km (6,000 miles) or 12 months for many models, depending on oil specification and driving conditions.

Major Service Intervals:

e.g., 50,000 km (30,000 miles) for spark plug replacement, transmission fluid service (check manual for exact spec).

Fluid Specifications

Engine Oil Spec:

API SG/SH or MB Approval 229.1, viscosity typically 10W-40 or 15W-40 depending on climate.

Transmission Fluid Auto:

MB 236.1, MB 236.6, or MB 236.7 (e.g., Dexron IIE for older units, specific MB fluids for later ones). Consult manual for specific transmission code.

Coolant Spec:

Mercedes-Benz approved coolant (e.g., G40 or G48) mixed 50/50 with distilled water.

Known Issues

Wiring Harness:

Degradation of insulation on early pre-facelift models ('biodegradable' wiring) leading to short circuits.

Headliner:

Sagging headliner fabric due to adhesive failure is common across many Mercedes models of this era.

Fuel System Leaks:

Degradation of fuel lines and O-rings, especially on K-Jetronic models.

Vacuum Lines:

Cracked or leaking vacuum lines affecting engine performance and climate control.

Rust:

Potential rust in wheel arches, sills, and around windows, particularly in areas with harsh winters.

📚 Vehicle History

Brand Heritage

Mercedes Benz Legacy:

Continued Mercedes-Benz's reputation for engineering excellence, durability, and luxury.

Model Evolution

Generation Span:

First Generation (1979-1985), Second Generation (1985-1991). The manual likely covers both phases of development.

Facelift:

Significant facelift occurred in 1985, introducing a lower profile grille, new bumpers, revised interior, and updated engines (e.g., M103).

Production

Production Period:

1979 to 1991

Manufacturing Location:

Sindelfingen, West Germany.

🏆 Awards & Recognition

Recognitions

Reputation:

Widely regarded as one of the most well-engineered and durable sedans of its time, often referred to as a 'modern classic' or 'future classic'.

Ratings

Reliability Perception:

High, when properly maintained, though specific components can be costly to repair.