Positioning:
The 560SEC represented the pinnacle of Mercedes-Benz engineering and luxury in the mid-1980s, a grand tourer coupe designed for discerning clientele.
Competitors:
Competed with other high-end luxury coupes of the era such as the BMW 7 Series Coupe (E24 635CSi), Jaguar XJ-S, and possibly some higher-spec models from Cadillac and Lincoln.
Features Highlight:
Powerful V8 engine, sophisticated independent suspension, luxurious interior appointments, advanced safety features for its time (e.g., ABS), and iconic coupe styling.
Value For Owner:
Empowers owners to perform maintenance and repairs, saving significant costs and enabling informed discussions with professional mechanics. Facilitates understanding of complex systems.
Coverage Scope:
All models, all configurations for 1986 Mercedes-Benz 560SEC
Estimated Page Count:
> 1000
Type:
Service and Repair Manual
Digital Format:
PDF (over 70 separate sections)
Compatibility:
Windows, Mac (requires Adobe Acrobat Reader)
Engine Mechanical:
Complete coverage of the M117 V8 engine, including disassembly, inspection, repair, and reassembly.
Engine Management:
Detailed diagnostics and repair procedures for the Bosch KE-Jetronic fuel injection system, ignition system, and emission control systems.
Transmission:
Repair and maintenance of the 4-speed automatic transmission (722.3).
Brakes:
Service and repair for the Anti-lock Braking System (ABS), brake fluid, calipers, rotors, and lines.
Suspension Steering:
Maintenance and repair of the independent front and rear suspension, power steering system, and steering components.
Electrical:
Comprehensive wiring schematics, diagnostic procedures for lighting, instrumentation, power windows, mirrors, seats, and climate control.
Body Chassis:
Bodywork repair, door mechanisms, glass replacement, interior trim, and structural components.
Maintenance:
Scheduled maintenance, fluid changes, filter replacements, lubrication, and inspection procedures.
Repair Rebuild:
Detailed step-by-step repair and overhaul instructions for all major mechanical and electrical components.
Troubleshooting:
Systematic diagnostic charts and troubleshooting guides for common and complex issues.
Part Identification:
Part layouts and identification of specific components and their corresponding part numbers.
Depth:
Comprehensive, covering basic maintenance to complete engine and transmission overhauls, electrical system diagnostics, and bodywork.
Displacement:
5.6 Liters (5549 cc)
Horsepower:
Approx. 238 hp @ 4750 rpm (European spec; US spec slightly lower due to emissions equipment)
Torque:
Approx. 330 lb-ft @ 3250 rpm (European spec)
Injection System:
Bosch KE-Jetronic (K-Jetronic with Lambda control)
Fuel Type:
Unleaded Gasoline (Premium)
Coolant Type:
Mercedes-Benz Specification 325.0 (or equivalent G05/G11 coolant)
Oil Type:
API SG/CD, SAE 15W-40 or 10W-40 recommended (check manual for specific MB approval numbers)
Length:
Approx. 4960 mm (195.3 in)
Width:
Approx. 1800 mm (70.9 in)
Height:
Approx. 1410 mm (55.5 in)
Curb Weight:
Approx. 1780 kg (3924 lbs)
Gross Vehicle Weight Rating:
Approx. 2200 kg (4850 lbs)
Historical Safety Context:
Designed in an era before standardized NCAP ratings. Focused on passive safety features and structural integrity.
ABS:
Standard Anti-lock Braking System (ABS)
Traction Control:
Optional ASD (Automatic Slip Differential) available on some later models, but likely not standard on 1986 560SEC.
Airbags:
Driver-side airbag standard; passenger airbag generally not available for this model year.
Seatbelts:
Three-point inertia-reel seatbelts for front and rear occupants.
Structure:
Reinforced passenger cell, crumple zones, and side-impact protection beams.
Audio System:
Original Becker Grand Prix or similar premium audio system, often with cassette player.
Cruise Control:
Standard cruise control system.
Seats:
Power-adjustable front seats with memory functions, heated seats often optional.
Windows Mirrors:
Power windows, power-adjustable and heated exterior mirrors.
Sunroof:
Power tilt/slide sunroof.
Oil Change Interval:
Typically every 10,000 km (6,000 miles) or 12 months, whichever comes first, under normal driving conditions (refer to manual for specifics).
Transmission Fluid Change:
Every 50,000 km (30,000 miles) or 24 months recommended, though some sources suggest longer intervals. Manual is definitive.
Spark Plugs:
Bosch Super Plus (e.g., W8AC or similar) or equivalent, replacement interval typically around 30,000-40,000 km.
Brake Fluid:
DOT 3 or DOT 4; always check manual for exact specification and bleeding procedures.
Power Steering Fluid:
MB Approved power steering fluid (often CHF 11S or similar, but manual is key).
Wiring Harness:
Degradation of wiring harness insulation, particularly in the engine bay and around the ECUs, can lead to electrical gremlins.
Fuel Distributor:
KE-Jetronic fuel distributors can develop issues with internal diaphragms or solenoids, affecting fuel delivery.
Hydropneumatic Suspension:
The self-leveling rear suspension (if equipped) can develop leaks in the accumulators or lines, leading to a saggy rear end.
Climate Control:
Behr climate control system issues, including blower motor failures, evaporator leaks, and control panel malfunctions.
Door Locks:
Vacuum-operated central locking system can develop leaks in hoses or actuators.
Mercedes Benz Legacy:
Mercedes-Benz has a long-standing reputation for engineering excellence, safety, and luxury vehicles, dating back to the late 19th century.
C126 Development:
The C126 coupe was based on the W126 S-Class sedan, offering a more stylish and personal luxury experience with a focus on performance and comfort.
560Sec Introduction:
The 560SEC was introduced in 1986 (as a 1986 model year) as the top-of-the-line variant, featuring the largest engine and the most luxury options.
Production Years C126:
1980-1991
Manufacturing Location:
Sindelfingen, West Germany
General Reputation:
While specific 'awards' for this exact model year are scarce, the C126 SEC chassis and the W126 S-Class generally received critical acclaim for their engineering, comfort, and luxury in automotive publications of the era.
Automotive Press:
Often lauded as one of the finest coupes of its generation, celebrated for its build quality, performance, and enduring style.
