Target Audience:
Mercedes-Benz owners (DIY enthusiasts), independent repair shops, Mercedes-Benz technicians
Advantage:
Provides factory-level accuracy and detail, unlike generic aftermarket manuals.
Authenticity:
Directly mirrors the documentation used by authorized Mercedes-Benz service centers.
Comprehensiveness:
Covers all aspects of vehicle service and repair, ensuring no critical information is omitted.
Primary Coverage:
Service and Repair
Engine Systems:
Diesel Engine (OM603.960), Fuel System, Lubrication System, Cooling System, Air Intake and Exhaust, Emission Control
Drivetrain Systems:
Automatic Transmission (722.5), Drive Shaft, Differential
Chassis Systems:
Suspension (Front & Rear), Steering System, Brakes (Hydraulic System, ABS)
Electrical Systems:
Engine Management, Lighting, Instrumentation, Power Accessories, Climate Control, Battery, Charging System
Body And Interior:
Body Panels, Doors, Windows, Seats, Upholstery, Trim, HVAC Ducts
Estimated Page Count:
Over 1500 (estimated for comprehensive factory manual)
Type:
Factory Workshop Service Repair Manual
Format:
HTML/Flash Menu with PDF content
Compatibility:
Windows (95/98/ME/XP/Vista/7), Linux, macOS
Maintenance:
Scheduled maintenance, fluid changes, filter replacements, inspections
Diagnostics:
Troubleshooting charts, fault code interpretation, diagnostic procedures
Repair Procedures:
Engine component removal/installation/rebuild, transmission overhaul, brake system repair, suspension component replacement, electrical component repair
Adjustments:
Valve adjustments, timing adjustments, idle speed settings
Installation:
Accessory installation, component replacement guidelines
Depth:
Comprehensive - from basic maintenance to complete engine and transmission rebuilds
Diagnostic Tools:
Includes procedures for using specialized diagnostic tools and equipment common at Mercedes-Benz dealerships.
Engine Type:
Inline 6-Cylinder Turbocharged Diesel
Displacement:
3.5 Liters (3449 cc)
Bore X Stroke:
87.0 mm x 92.4 mm
Compression Ratio:
22.0:1
Horsepower Net:
134 hp @ 4600 rpm
Torque Net:
217 lb-ft @ 2400 rpm
Injection System:
Bosch Inline Injection Pump (VE type)
Oil Capacity With Filter:
7.5 Liters (8.0 US Quarts)
Recommended Oil Viscosity:
SAE 15W-40 Diesel Engine Oil (API CD or higher)
Coolant Capacity:
11.0 Liters (11.6 US Quarts)
Coolant Type:
Mercedes-Benz Specification 325.0 (Antifreeze/Coolant, Blue)
Emission Standards:
Federal Tier 1 (USA) / Euro 1 (Europe)
Type:
4-Speed Automatic (722.5)
Gear Ratios:
1st: 3.68, 2nd: 2.40, 3rd: 1.44, 4th: 1.00, Reverse: 4.20
Transmission Fluid Capacity:
8.0 Liters (8.5 US Quarts) (dry fill)
Transmission Fluid Type:
MB Spec 236.1 (Dexron II compatible)
Overdrive:
Yes (4th Gear)
Lock-Up Torque Converter:
Yes
NHTSA Rating 1991:
Driver Side: 4 Stars, Passenger Side: 4 Stars (for sedans of the era)
ABS:
Standard (Anti-lock Braking System)
Airbags:
Driver's Side Airbag (Standard)
Seatbelts:
Front Inertia Reel Seatbelts, Rear Three-Point Seatbelts
Crumple Zones:
Advanced crumple zones designed for occupant protection.
Oil Change Interval:
Every 10,000 km (6,000 miles) or 12 months, whichever comes first.
Air Filter Replacement:
Every 40,000 km (24,000 miles)
Fuel Filter Replacement:
Every 40,000 km (24,000 miles)
Transmission Fluid Change:
Every 60,000 km (36,000 miles)
Coolant Flush:
Every 60,000 km (36,000 miles) or 3-4 years
Power Steering Fluid:
MB Spec 236.3 (Dexron II compatible)
Brake Fluid:
DOT 3 or DOT 4 Hydraulic Brake Fluid
Diesel Specific:
Glow plug issues, injector pump timing, exhaust manifold cracks (common on older diesels), EGR system maintenance.
Common W126:
Headliner sagging, window regulator failures, vacuum line leaks (affecting central locking, climate control, door locks), SRS system warnings, climate control blower motor resistor failures, ABS sensor issues.
Oil Filter Example:
Mann Filter W102/2, Bosch 3323 (verify specific application)
Air Filter Example:
Mann Filter C32170 (verify specific application)
Mercedes Benz Legacy:
Renowned for engineering excellence, luxury, and durability.
W126 Generation:
Second generation of the S-Class (W126) produced from 1979 to 1991. The 1991 model year represents the final iteration of this highly successful platform.
Production Period:
W126: 1979-1991
Significant Updates For 1991:
The 1991 model year saw continued refinement of the W126 chassis, maintaining its position as a benchmark in luxury and engineering. Minor updates may include trim and feature adjustments.
