Positioning:
The Mercedes-Benz W140 S-Class represented the pinnacle of luxury and engineering for its era, positioning the 400 SE as a high-performance, technologically advanced executive sedan.
Competitors:
Competed with other flagship luxury sedans of the early 1990s, such as the BMW 7 Series (E32), Lexus LS 400, and Jaguar XJ.
Distinguishing Features:
Known for its robust build quality, advanced safety features for the time, powerful V8 engine, and opulent interior. The 400 SE specifically offered a balance of performance and refinement.
Systems Covered:
Engine mechanical, engine electrical, fuel system, ignition system, cooling system, lubrication system, exhaust system, drivetrain, transmission (automatic), brakes, steering, suspension, chassis, body, electrical system, climate control, infotainment, safety systems.
Type:
Complete Workshop Service Repair Manual
Format:
Downloadable Digital File (PDF)
Engine Mechanical:
Detailed disassembly, inspection, repair, and reassembly of all engine components including cylinder head, block, pistons, connecting rods, crankshaft, camshafts, valves, timing system.
Engine Electrical:
Troubleshooting and repair of starting system, charging system, ignition system (including distributorless ignition system components for this era), engine control unit (ECU) diagnostics and wiring.
Fuel System:
Bosch KE-Jetronic fuel injection system details, fuel pump, injectors, fuel pressure regulator, air flow meter, troubleshooting fuel delivery and mixture issues.
Transmission:
Detailed procedures for the 4-speed automatic transmission (e.g., 722.3 or 722.4 series), including hydraulic control, torque converter, valve body, and shift control system.
Brakes:
ABS (Anti-lock Braking System) operation and troubleshooting, hydraulic brake system, brake pad and rotor replacement, brake fluid specifications and bleeding procedures.
Suspension Steering:
Front and rear suspension component identification, replacement (e.g., control arms, shock absorbers, springs), power steering system diagnosis and repair, wheel alignment specifications.
Electrical Body:
Comprehensive wiring diagrams, lighting systems, power windows, power seats, central locking, exterior and interior trim removal and installation, body panel repair.
Maintenance:
Routine scheduled maintenance, oil changes, filter replacements, spark plug replacement, coolant flushes, brake fluid changes, lubrication points.
Troubleshooting:
Systematic diagnostic procedures for common and uncommon faults, fault code interpretation (where applicable for the era), electrical system troubleshooting charts.
Repair:
Detailed step-by-step instructions for component replacement, overhaul, and repair across all vehicle systems.
Depth:
Comprehensive, from basic routine maintenance to complete engine and transmission overhauls, advanced electrical diagnostics, and bodywork.
Quality:
High-resolution, optimized for readability and printing. Likely contains searchable text for efficient navigation.
Printability:
Fully printable, allowing users to print individual pages, chapters, or the entire manual.
Digital Binding:
N/A (Digital format, user can bind printed copy)
Digital Paper Type:
N/A (Digital format)
Configuration:
4.2L V8 SOHC (later DOHC in some variants, but the 1992 400 SE typically featured the SOHC M119)
Horsepower:
Approx. 270-280 hp (SAE net)
Torque:
Approx. 280-290 lb-ft (SAE net)
Injection Type:
Bosch KE-Jetronic Electronic Fuel Injection with Lambda control
Fuel Type:
Premium Unleaded Gasoline (91+ octane recommended)
Ratings:
While official NHTSA ratings for this specific year/model are scarce, the W140 was engineered with a strong emphasis on structural integrity and safety features. Expected to perform well in era-appropriate crash testing.
Features:
Anti-lock Braking System (ABS), Traction Control System (ASR - Acceleration Skid Control, standard on some later W140 models, might be optional or absent on early 400 SE).
Features:
Driver and front passenger airbags, reinforced safety cage, crumple zones, side-impact protection beams, seatbelt pre-tensioners.
System:
Basic AM/FM stereo with cassette player, often with premium sound system options. Navigation systems were nascent and rare at this price point for 1992. Climate control system with automatic temperature regulation.
Features:
ABS, cruise control. Limited advanced driver-assistance systems compared to modern vehicles. Features like automatic climate control and power seat memory were considered high-tech for the era.
Features:
N/A in the modern sense (no Bluetooth, USB, or integrated smartphone connectivity)."
Oil Change:
Every 7,500-10,000 miles or 12 months, whichever comes first, depending on driving conditions. Consult manual for specific recommendations.
Transmission Fluid Change:
Every 30,000-60,000 miles (dependent on manufacturer recommendation and fluid type used; often considered 'lifetime' but regular changes are recommended for longevity).
Coolant Change:
Every 2-3 years or 30,000-40,000 miles.
Engine Oil Type:
API SJ or higher, viscosity 0W-40 or 5W-40 synthetic oil recommended for optimal performance and protection.
Transmission Fluid Type:
MB 236.6 (e.g., Dexron III or equivalent)
Coolant Type:
Mercedes-Benz Approved Antifreeze/Coolant (e.g., G05 or G48 equivalent), typically a 50/50 mix with distilled water.
Common Wear Items:
Vacuum hose degradation (leading to central locking/door lock issues), ignition coil failure, spark plug wire deterioration, suspension component wear (ball joints, bushings), OVP relay failure, catalytic converter issues, MAF sensor issues.
Heritage:
Mercedes-Benz has a long-standing reputation for luxury, engineering excellence, and automotive innovation, particularly with its S-Class line, which has consistently represented the brand's technological and comfort apex.
Predecessor:
W126 S-Class
Production Years:
1991-1998 (for W140 generation)
Manufacturing Location:
Germany
