Target Audience:
Owners of the 1989 Mercedes-Benz W126 SEL, DIY mechanics, automotive enthusiasts.
Differentiation:
Vehicle-specific, factory-level documentation, offering direct insights used by dealership technicians, superior to generic repair guides.
Convenience:
Single, easy-to-use PDF manual; print-on-demand pages; searchable content.
Accessibility:
Digital format allows for easy storage, access, and portability (when printed).
Primary Coverage:
All models and all repairs A-Z for the 1989 Mercedes-Benz W126 SEL.
Diagnostic Coverage:
Diagnosis, maintenance, service, and repair procedures.
Estimated Pages:
Likely extensive, consistent with factory-level service manuals for this era; specific count not provided but described as comprehensive.
Type:
Factory Service and Repair Manual
Engine And Control:
Engine, Control System, Fuel Service Specifications, Emission Control, Intake Exhaust Cooling, Lube, Ignition Starting Charging.
Drivetrain:
Auto Transmission, Manual Transmission (if applicable to SEL models), Clutch, Transfer Propeller Shaft, Drive Shaft, Differential, Axle Suspension.
Chassis And Brakes:
Tire & Wheel, Brake Control, Brake, Parking Brake, Steering Column, Power Steering.
Electrical And Body:
Electrical, Air Condition, Suppl Restraint System, Seat Belt, Engine Immobilizer, Cruise Control, Wiper & Washer, Door Lock, Meter Audio/Visual, Horn, Windshield/Glass Mirror, Instrument Panel, Seat, Engine Hood/ Door, Exterior & Interior, Multiplex/ Can Communication.
Repair Procedures:
Complete step-by-step instructions for all repairs, diagnosis, and servicing.
Maintenance Procedures:
Detailed maintenance schedules and procedures.
Diagnostic Procedures:
Diagnostic strategies and troubleshooting guides.
Depth:
Vehicle-specific, factory-level detail, not generic information.
Illustrations:
Diagrams, illustrations, wiring schematics.
Specifications:
Comprehensive technical specifications for all components and systems.
Compatibility:
Windows Vista (32/64), XP, ME, 98, NT, 2000, and Mac compatible.
Software Requirements:
Adobe PDF Reader, Winzip (free online).
Printability:
All pages are printable; ability to blow-up images and print enlarged copies.
Binding Format:
Digital (PDF) - no physical binding.
Digital Paper Experience:
No greasy or torn pages; safe storage on PC.
Engine Type:
For 1989 W126 SEL, likely the M117 V8 engine (e.g., 5.6L).
Displacement:
Approximately 5.6 liters (5549 cc) for the SEL model in 1989.
Horsepower:
Typically around 238-260 hp (SAE net) depending on specific market and tuning for the 5.6L M117.
Torque:
Approximately 330-340 lb-ft for the 5.6L M117.
Fuel Injection:
Bosch KE-Jetronic or similar fuel injection system, with electronic control for ignition timing.
Fuel Type:
Premium Unleaded Gasoline (Octane Rating as specified by Mercedes-Benz).
Oil Specification:
API SG or higher, SAE 15W-40 or 10W-30 depending on climate. Refer to manual for exact MB specification (e.g., MB 229.1).
Coolant Specification:
Ethylene glycol-based coolant mixed 50/50 with distilled water. Refer to manual for specific MB coolant type.
Transmission Type:
4-speed automatic transmission (722.3 or 722.4 series).
Manual Option:
Manual transmission was not typically offered on the SEL (long-wheelbase) models.
Shift Modes:
Comfort (C) and Sport (S) modes.
Transmission Fluid Spec:
Dexron III or equivalent ATF (refer to manual for specific MB approval, e.g., MB 236.6).
Wheelbase:
Approximately 115.9 inches (2945 mm) for the SEL long-wheelbase model.
Overall Length:
Approximately 201.6 inches (5120 mm) for the SEL.
Curb Weight:
Around 3900-4100 lbs (1770-1860 kg) depending on options.
Gross Vehicle Weight Rating:
Refer to vehicle's compliance plate; typically around 5100-5300 lbs (2300-2400 kg).
Crash Test Data:
While specific NHTSA ratings for 1989 might be limited, the W126 was known for its robust safety cage and engineered crumple zones for its era. Manual will detail safety systems.
Brake System:
Anti-lock Braking System (ABS) standard on most 1989 models.
Airbags:
Driver's airbag (SRS - Supplemental Restraint System) was standard on 1989 models.
Seatbelts:
Front and rear seat belts, with automatic tensioners for front belts.
Audio System:
Factory fitted Becker brand stereo systems, often with cassette player and AM/FM radio. Optional CD changer.
Cruise Control:
Standard cruise control system. Manual covers operation and troubleshooting.
Multiplex Communication:
While not 'CAN bus' in the modern sense, the manual covers multiplex communication systems and wiring for various electronic modules.
Oil Change Interval:
Typically every 5,000 to 7,500 miles or annually, whichever comes first. Manual will specify exact intervals based on driving conditions.
Transmission Service:
Fluid and filter change typically recommended every 30,000 to 50,000 miles. Manual will provide precise interval.
Major Tune Up:
Spark plugs, fuel filter, air filter replacement generally around 30,000 miles. Manual provides detailed schedule.
Brake Fluid:
DOT 3 or DOT 4 hydraulic brake fluid (refer to manual for precise specification).
Power Steering Fluid:
Hydraulic fluid meeting MB specification (often Pentosin CHF 11S or similar).
Common Wear Items:
Fuel accumulator, OVP relay (Over Voltage Protection), vacuum hoses, climate control system components, window regulators, seat heater elements.
Engine Specific Notes:
M117 V8 engines are generally robust but can have issues with timing chain guides over high mileage. The K-Jetronic fuel system requires precise adjustment and clean components.
Mercedes Benz Legacy:
Mercedes-Benz has a long-standing reputation for luxury, engineering excellence, and safety, which the W126 epitomizes.
W126 Generation:
The W126 was the second generation of the S-Class, produced from 1979 to 1992. The 1989 model is part of the facelifted version introduced in 1985, featuring improved aerodynamics, updated interiors, and revised powertrains.
Production Period:
W126 production ran from 1979 to 1991/1992. The SEL variant was a long-wheelbase version of the sedan.
