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Mercedes-benz

Mercedes-Benz W114/W115 Factory Repair Manual 1968-1976

Mercedes-Benz W114/W115 Factory Repair Manual 1968-1976

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Vehicle data plateRef 132931
Brand
Mercedes-benz
Vehicle
Car
Models covered
Engines, Mercedes, Mercedes Benz, W114, W115
Years
1968, 1969, 1970, 1971, 1972, 1973, 1974, 1975, 1976
Format
PDF, searchable, print-ready
Delivery
Instant download after checkout
Language
English

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Basic Information
Identification
Make: Mercedes-Benz
Model: W114/W115
Chassis Code: W114 (Sedan/Coupe), W115 (Sedan)
Model Names Listed: 220, 220D, 230, 240D, 250, 250C, 280, 280C, 300D
Generation
Generation Name: Stroke Eight
Production Years: 1968-1976
Codes
Internal Project Code: Project 114/115
Introduction
Market Position
Positioning: The Mercedes-Benz W114/W115 series, often referred to as the 'Stroke Eight', represented a significant step in Mercedes-Benz's history, bridging the gap between earlier luxury sedans and the more modern designs that followed. It was positioned as a robust, reliable, and technologically advanced mid-size luxury car for its era, appealing to a discerning clientele valuing quality engineering and durability.
Competitive Analysis
Competitors: Competed with vehicles like the BMW Neue Klasse (1502-2002 series), Jaguar XJ, Audi 100, and Volvo 140 series. The W114/W115 distinguished itself through its superior build quality, advanced engineering (especially diesel engines and suspension), and comfort.
Key Features
Distinguishing Features: Monocoque construction, independent suspension on all four wheels, sophisticated multi-link rear suspension, powerful and efficient diesel engines (a Mercedes-Benz hallmark), advanced safety features for its time, and exceptional durability.
Model Evolution
Specific Model Variants Covered: 220, 220D, 230, 240D, 250, 250C, 280, 280C, 300D. Includes both gasoline and diesel variants across the specified years.
Manual Details
Coverage Areas
Countries Of Operation: Global (primarily Europe and North America)
Page Count
Estimated Pages: Likely 500+ pages (typical for factory-level service manuals of this era)
Manual Type
Type: Factory Authorized Service and Repair Manual
Scope: Comprehensive Service and Repair Manual
Language
Language: English
Format
Format: Digital Download (likely PDF)
Manual Coverage
Systems Covered
Engine: Complete engine overhaul, tuning, fuel injection systems (Bosch D-Jetronic, mechanical injection for diesels), ignition systems, cooling systems, lubrication systems.
Transmission: Manual and automatic transmission service, repair, overhaul, clutch replacement, driveline components.
Brakes: Hydraulic brake systems, disc brake overhaul (front and rear), drum brake service (rear), parking brake system, brake fluid specifications and bleeding procedures.
Suspension: Front suspension (independent, ball joints, control arms, springs, shock absorbers), rear suspension (independent, semi-trailing arms, springs, shock absorbers), steering system (steering gear, linkages, power steering).
Electrical: Complete wiring diagrams, starter system, charging system (alternator), battery, lighting systems (headlights, taillights, interior), instrumentation, wipers, horn, fuse panel diagnostics.
Bodywork: Body panel removal and installation, door mechanisms, window regulators, seals, trim, convertible top mechanisms (for coupe models), structural repair recommendations.
Climate Control: Heater core service, ventilation systems, optional air conditioning system diagnostics and repair (if equipped).
Exhaust System: Exhaust manifold, catalytic converter (if equipped on later models), muffler, and pipe replacement and repair.
Procedures Included
Maintenance: Scheduled maintenance intervals, oil changes, filter replacements, lubrication points, coolant flushes, tune-up procedures.
Troubleshooting: Diagnostic charts for common problems, fault finding for engine performance, electrical issues, braking system malfunctions.
Repair: Detailed step-by-step repair procedures for all major systems, including component removal, disassembly, inspection, reassembly, and installation.
Diagnostics: Component testing procedures, specifications for readings (e.g., compression, resistance, voltage), diagnostic tools required.
Engine Mechanical: Engine assembly, disassembly, piston ring replacement, bearing replacement, valve guide and seat service, crankshaft and camshaft inspection and alignment, timing chain and gear replacement.
Fuel System Gasoline: Carburetor overhaul and adjustment (e.g., Zenith Stromberg, Solex), fuel pump replacement, fuel filter service, fuel line routing and inspection. D-Jetronic system diagnostics, sensor testing, and control unit troubleshooting.
Fuel System Diesel: Injector pump timing and adjustment, injection nozzle testing and replacement, glow plug system service, fuel filter replacement, bleeding the fuel system.
Cooling System: Radiator removal and repair, water pump replacement, thermostat testing and replacement, coolant hose inspection and replacement, fan clutch service.
Transmission Manual: Gearbox removal and disassembly, synchromesh ring replacement, gear set inspection, clutch replacement, driveshaft and universal joint service.
Transmission Automatic: Automatic transmission overhaul, fluid and filter changes, torque converter testing, valve body diagnostics, kickdown cable adjustment.
Steering System: Steering box adjustment and repair, tie rod end and drag link replacement, power steering pump and cylinder service, bleeding the power steering system.
Electrical Diagnostics: Testing of starter motor, alternator output, voltage regulator, battery condition, and all lighting circuits using multimeter and wiring diagrams. Troubleshooting intermittent electrical faults.
Interior Trim: Removal and installation of door panels, dashboard components, headliner, and seats for access to underlying systems. Convertible top mechanism adjustments and fabric replacement guidance.
Body Hardware: Door lock mechanisms, window cranks/regulators, hood and trunk latches, exterior trim piece installation and removal.
Heating And Ventilation: Blower motor service, heater control valve operation, flap adjustments, and ductwork inspection.
Technical Depth
Depth: Comprehensive factory-level detail suitable for professional mechanics and advanced DIY enthusiasts. Covers everything from routine maintenance to complete engine and transmission rebuilds.
Torque Specifications: Precise torque values for all critical fasteners, including engine components, suspension parts, and wheel lug nuts.
Clearances: Specified bearing clearances, piston ring end gap, valve lash settings (if applicable), and other critical component clearances.
Catalogue References: Likely includes part number references for major components, facilitating parts sourcing.
Wiring Diagrams: Comprehensive, often color-coded, wiring diagrams for all electrical systems.
Diagnostic Charts: Systematic troubleshooting guides based on symptoms.
Diagnostic Troubleshooting Trees: Flowcharts and step-by-step guides to diagnose issues based on symptoms, leading to the likely cause and repair.
Manual Specifications
File Format
File Type: PDF
Searchability: Likely searchable PDF format, allowing for quick retrieval of information using keywords.
Print Quality
Quality: High-resolution scans of original factory documentation, ensuring clarity of text and diagrams. Searchable text capabilities are highly probable.
Binding Type
Binding: N/A (Digital Download)
Paper Type
Paper: N/A (Digital Download)
Engine Specifications
Primary Engine
Engine Options Listed: 2.2L Inline-4 (M115), 2.4L Diesel Inline-4 (OM615), 2.5L Inline-6 (M114), 2.8L Inline-6 (M110), 3.0L Diesel Inline-5 (OM617)
Performance
Power Output Range: Approximately 70 hp (220D) to 180 hp (280/280C with fuel injection).
Fuel System
Fuel Delivery: Carbureted (e.g., Solex, Zenith) for gasoline models, mechanical indirect injection (Bosch) for diesel models, and early Bosch D-Jetronic electronic fuel injection for higher-performance gasoline variants (like some 280 models).
Transmission
Standard
Standard Transmission: 4-speed manual transmission was common on lower-spec models.
Optional
Optional Transmission: Optional 4-speed and later 3-speed automatic transmissions (e.g., 'Hydrak' or typical Mercedes-Benz automatic).
Features
Transmission Features: Robust and smooth shifting for both manual and automatic options, designed for longevity and comfort.
Dimensions
Exterior
Body Styles: 4-door Sedan, 2-door Coupe (W114 only).
Wheelbase: Approximately 2710 mm (106.7 in) for Sedans, 2710 mm (106.7 in) for Coupes.
Weights
Curb Weight Range: Approximately 1400 - 1650 kg (3086 - 3638 lbs) depending on model and engine.
Safety Features
Ratings
Crash Test Data: Formal crash test ratings as we know them today were not as prevalent. However, the W114/W115 incorporated advanced safety features for its time, including a safety cell, deformable crumple zones, padded interior, and a safety steering column.
Active Features
Active Safety: Four-wheel disc brakes (on some later models, front discs standard on most), powerful hydraulic braking system, precise steering.
Passive Features
Passive Safety: Safety chassis design, laminated windshield, padded dashboard and steering wheel, dual-circuit braking system.
Technology Features
Infotainment
Audio System: Factory original radios were typically analog AM/FM units, often with a single speaker. Cassette players were rare and aftermarket additions.
Driver Assistance
Advanced Features: Features like cruise control were optional on higher-spec models. No electronic driver-assistance systems as known today.
Connectivity
Connectivity Options: None. This era of vehicle predates widespread automotive connectivity.
Maintenance
Service Intervals
Oil Change Interval: Typically every 5,000-7,500 miles (8,000-12,000 km) or annually, depending on usage and oil quality.
Tune Up Interval: Spark plug replacement, ignition timing adjustment, and carburetor/injection system checks were generally recommended every 15,000-25,000 miles (24,000-40,000 km).
Fluid Specifications
Engine Oil: SAE 10W-30 or 10W-40 API SF or SG rating for gasoline engines; SAE 15W-40 API CD or CE rating for diesel engines (consult manual for specific viscosity based on climate).
Coolant: Ethylene glycol based antifreeze mixed 50/50 with distilled water. Mercedes-Benz specifications should be followed if available.
Brake Fluid: DOT 3 or DOT 4 hydraulic brake fluid.
Transmission Fluid Auto: Dexron II or equivalent ATF (Automatic Transmission Fluid).
Differential Fluid: Typically GL-5 SAE 90 gear oil, though specific Mercedes-Benz specifications should be verified.
Power Steering Fluid: Specific power steering fluid or ATF, depending on the system type. Consult manual.
Known Issues
Common Problems: Rust on body panels (especially wheel arches, rocker panels, window sills), aging rubber seals and bushings, potential wear in steering and suspension components, fuel injection system maintenance (especially older D-Jetronic), vacuum line deterioration, overheating on high-mileage diesel engines.
Diesel Specific Issues: Glow plug reliability, injector pump maintenance, occasional wear in the OM617 engine's timing chain tensioner.
Ignition System: Distributor wear, coil failure, spark plug fouling (especially in older gasoline models).
Vehicle History
Brand Heritage
Mercedes Benz Legacy: Mercedes-Benz has a long-standing reputation for engineering excellence, safety, and durability, established throughout the 20th century. The W114/W115 continued this tradition.
Mercedes Benz Philosophy: Emphasis on building cars to last ('engineered like no other car in the world'), safety, and occupant comfort.
Model Evolution
Evolution Of Stroke Eight: Introduced in 1968, the W114 (6-cylinder) and W115 (4-cylinder) were designed to be modern, safe, and comfortable vehicles. They evolved through various engine updates and styling refinements over their production run, culminating in the 300D with the legendary OM617 five-cylinder diesel engine.
Production
Production Period: 1968 to 1976. Over 1.9 million units were produced across all variants.

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