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Introduction
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Market Position
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Positioning:
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Premium mid-size luxury automobile, a significant step in Mercedes-Benz's evolution towards more modern unibody construction and styling.
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Competitive Analysis
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Competitors:
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BMW 2000/2002 series, Audi 100, Jaguar XJ6, Volvo 140 series, and other European luxury sedans and coupes of the era.
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Key Features
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Chassis Design:
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First Mercedes-Benz model to utilize unibody construction, a departure from body-on-frame designs of earlier large sedans.
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Styling:
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Designed by Paul Bracq, it featured a more modern, cleaner aesthetic compared to previous Mercedes models, with a focus on safety and passenger comfort.
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Engine Options:
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Initially offered with a 2.5-liter inline-six engine, with later variants and diesel options becoming available in the W115 chassis.
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Value Proposition
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Manual Utility:
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Essential for owners and technicians seeking accurate, dealer-level repair and maintenance information for these classic Mercedes-Benz vehicles.
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Manual Coverage
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Systems Covered
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Engine:
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Complete engine overhaul, tuning, troubleshooting, fuel injection systems (e.g., Bosch D-Jetronic), carburetion (if applicable), cooling system, lubrication system.
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Transmission:
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Manual and automatic transmission service, repair, overhaul, fluid specifications, clutch service.
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Brakes:
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Front disc brake systems, rear drum brake systems (potentially disc on some later models), hydraulic systems, brake fluid specifications, troubleshooting.
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Suspension:
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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.
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Electrical:
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Wiring diagrams, starter system, charging system (alternator), ignition system, lighting, instruments, switches, fuses, battery specifications.
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Bodywork And Trim:
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Body panel removal and installation, door mechanisms, window regulators, interior trim components, seats, upholstery, exterior trim pieces, bumpers.
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HVAC:
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Heating and ventilation systems, potential air conditioning system service (if factory-equipped).
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Fuel System:
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Fuel tank, fuel lines, fuel pump, fuel filters, injection/carburetion system diagnostics and repair.
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Cooling System:
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Radiator, thermostat, water pump, hoses, coolant specifications, troubleshooting.
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Procedures Included
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Maintenance:
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Routine maintenance schedules, oil change procedures, filter replacements, lubrication points, fluid level checks.
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Troubleshooting:
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Diagnostic procedures for common and uncommon issues across all systems.
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Repair:
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Detailed step-by-step repair instructions for virtually all components and systems.
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Overhaul Rebuild:
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Complete engine rebuild, transmission overhaul, differential repair, brake system rebuilding.
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Installation:
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Component installation and removal procedures.
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Technical Depth
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Depth:
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Comprehensive: Covers everything from basic adjustments and maintenance to complete component teardown and rebuilding, including detailed diagnostic procedures and specifications.
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Engine Specifications
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Primary Engine
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Engine Code And Type:
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M114 (inline-six, SOHC, gasoline), OM615 (inline-four, OHC, diesel) for W115 models.
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Displacement:
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2496 cc (for M114 engine)
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Performance
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Horsepower:
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Approximately 130-150 hp (SAE Gross) for gasoline variants, depending on specific engine tune and market.
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Torque:
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Approximately 205 Nm (151 lb-ft) for gasoline variants.
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Fuel System
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Fuel Delivery:
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Bosch D-Jetronic electronic fuel injection (for most gasoline models) or Zenith carburetors.
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Recommended Fuel:
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Premium Unleaded Gasoline (Octane rating suitable for the era, e.g., 91-98 RON / 87-93 AKI)
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Lubrication System
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Oil Capacity:
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Approximately 5.0 - 5.5 liters (with filter) for inline-six engines.
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Cooling System
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Coolant Capacity:
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Approximately 7.0 - 8.0 liters.
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Maintenance
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Service Intervals
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Oil Change Interval:
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Typically every 5,000 - 7,500 miles (8,000 - 12,000 km) or annually.
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Tune Up Interval:
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Spark plug replacement, ignition timing checks, and carburetor/fuel injection adjustments typically recommended every 15,000 - 25,000 miles (24,000 - 40,000 km).
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Transmission Service:
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Fluid and filter change for automatic transmissions every 20,000 - 30,000 miles (32,000 - 48,000 km).
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Fluid Specifications
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Engine Oil Type:
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SAE 10W-40 or 20W-50 API SG or SF classification (consult specific manual for precise recommendation).
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Coolant Type:
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Ethylene glycol-based antifreeze with corrosion inhibitors, typically mixed 50/50 with distilled water.
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Brake Fluid Type:
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DOT 3 or DOT 4 hydraulic brake fluid.
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Known Issues
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Common Wear Items:
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Front suspension bushings, ball joints, tie rod ends, exhaust system components, vacuum lines.
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Engine Specific:
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Potential for timing chain wear on higher mileage inline-six engines, fuel injection system maintenance for D-Jetronic.
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Bodywork Corrosion:
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Prone to rust in typical areas such as wheel wells, rocker panels, door bottoms, and strut towers, especially in humid or salty climates.
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