Basic Information Identification Make: Mercedes-Benz Model: 250 Generation Chassis Code: W114/W115 Codes Internal Model Designation: W114 (sedan, coupe), W115 (sedan, diesel) Introduction Market Position Positioning: Premium mid-size luxury automobile, a significant step in Mercedes-Benz's evolution towards more modern unibody construction and styling. Competitive Analysis Competitors: BMW 2000/2002 series, Audi 100, Jaguar XJ6, Volvo 140 series, and other European luxury sedans and coupes of the era. Key Features Chassis Design: First Mercedes-Benz model to utilize unibody construction, a departure from body-on-frame designs of earlier large sedans. Styling: Designed by Paul Bracq, it featured a more modern, cleaner aesthetic compared to previous Mercedes models, with a focus on safety and passenger comfort. Engine Options: Initially offered with a 2.5-liter inline-six engine, with later variants and diesel options becoming available in the W115 chassis. Value Proposition Manual Utility: Essential for owners and technicians seeking accurate, dealer-level repair and maintenance information for these classic Mercedes-Benz vehicles. Manual Details Coverage Areas Vehicle Years Covered: 1968, 1969, 1970, 1971, 1972 Page Count Estimated Page Count: Extensive (typically 800-1500+ pages for a full factory manual) Manual Type Type: Factory Workshop Service and Repair Manual Language Language: English (presumed based on product description, original may be German) Format Format: HTML/Flash menu with PDF Manual Coverage Systems Covered Engine: Complete engine overhaul, tuning, troubleshooting, fuel injection systems (e.g., Bosch D-Jetronic), carburetion (if applicable), cooling system, lubrication system. Transmission: Manual and automatic transmission service, repair, overhaul, fluid specifications, clutch service. Brakes: Front disc brake systems, rear drum brake systems (potentially disc on some later models), hydraulic systems, brake fluid specifications, troubleshooting. Suspension: Front independent suspension (e.g., double wishbone, coil springs), rear independent suspension (e.g., swing axle, trailing arm, coil springs), steering system, shock absorbers, bushings, alignment specifications. Electrical: Wiring diagrams, starter system, charging system (alternator), ignition system, lighting, instruments, switches, fuses, battery specifications. Bodywork And Trim: Body panel removal and installation, door mechanisms, window regulators, interior trim components, seats, upholstery, exterior trim pieces, bumpers. HVAC: Heating and ventilation systems, potential air conditioning system service (if factory-equipped). Fuel System: Fuel tank, fuel lines, fuel pump, fuel filters, injection/carburetion system diagnostics and repair. Cooling System: Radiator, thermostat, water pump, hoses, coolant specifications, troubleshooting. Procedures Included Maintenance: Routine maintenance schedules, oil change procedures, filter replacements, lubrication points, fluid level checks. Troubleshooting: Diagnostic procedures for common and uncommon issues across all systems. Repair: Detailed step-by-step repair instructions for virtually all components and systems. Overhaul Rebuild: Complete engine rebuild, transmission overhaul, differential repair, brake system rebuilding. Installation: Component installation and removal procedures. Technical Depth Depth: Comprehensive: Covers everything from basic adjustments and maintenance to complete component teardown and rebuilding, including detailed diagnostic procedures and specifications. Manual Specifications File Format Digital Format: HTML/Flash menu with embedded PDF files for specific sections/chapters. Print Quality Digital Quality: Likely scanned from original print, quality can vary; expect clear text and diagrams if well-produced. Binding Type Binding Type: N/A (Digital Format) Paper Type Paper Type: N/A (Digital Format) Engine Specifications Primary Engine Engine Code And Type: M114 (inline-six, SOHC, gasoline), OM615 (inline-four, OHC, diesel) for W115 models. Displacement: 2496 cc (for M114 engine) Performance Horsepower: Approximately 130-150 hp (SAE Gross) for gasoline variants, depending on specific engine tune and market. Torque: Approximately 205 Nm (151 lb-ft) for gasoline variants. Fuel System Fuel Delivery: Bosch D-Jetronic electronic fuel injection (for most gasoline models) or Zenith carburetors. Recommended Fuel: Premium Unleaded Gasoline (Octane rating suitable for the era, e.g., 91-98 RON / 87-93 AKI) Lubrication System Oil Capacity: Approximately 5.0 - 5.5 liters (with filter) for inline-six engines. Cooling System Coolant Capacity: Approximately 7.0 - 8.0 liters. Transmission Standard Transmission Type: 4-speed manual transmission. Optional Transmission Type: Optional 4-speed automatic transmission (e.g., "Flexomatic"). Features Clutch Type: Single dry plate, diaphragm spring clutch for manual transmissions. Fluid Specifications Automatic Transmission Fluid: Dexron II or equivalent (consult manual for exact specification). Dimensions Exterior Wheelbase: W114 Sedan: 2750 mm (108.3 in); W114 Coupe: 2750 mm (108.3 in); W115 Sedan: 2750 mm (108.3 in). Length: W114 Sedan: approx. 4730 mm (186.2 in); W114 Coupe: approx. 4710 mm (185.4 in); W115 Sedan: approx. 4730 mm (186.2 in). Weights Curb Weight: Approximately 1400-1500 kg (3086-3307 lbs) depending on body style and equipment. Safety Features Ratings Crash Test Info: No formal crash test ratings from modern agencies like NHTSA or Euro NCAP available for this era. Safety was primarily achieved through robust construction, crumple zones, and advanced (for the time) passive restraint systems. Active Features Braking System: Front disc brakes with dual-circuit hydraulic system, rear drum brakes. Passive Features Body Structure: Reinforced passenger cell, energy-absorbing steering column, padded dashboard and interior surfaces. Seat Belts: Lap and shoulder belts often standard or optional, depending on market and year. Technology Features Infotainment Audio System: Period-appropriate AM/FM radio, possibly with a single speaker. Cassette or 8-track players were optional upgrades. Driver Assistance...