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Mercedes Benz W114 250C 1968-1972 Service Repair Manual
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Basic Information Identification Make: Mercedes-Benz Model: W114 250C Model Variant: Coupe Chassis Code: W114.023 Generation Generation Designation: First Generation Codes Engine Code Primary: M114 (Inline-6) Engine Type Primary: Gasoline, Overhead...
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SKU: 157641
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| Basic Information | |
| Identification | |
| Make: | Mercedes-Benz |
| Model: | W114 250C |
| Model Variant: | Coupe |
| Chassis Code: | W114.023 |
| Generation | |
| Generation Designation: | First Generation |
| Codes | |
| Engine Code Primary: | M114 (Inline-6) |
| Engine Type Primary: | Gasoline, Overhead Cam (OHC), Inline-6 Cylinder |
| Introduction | |
| Market Position | |
| Target Audience: | Do-it-yourself enthusiasts and experienced mechanics seeking comprehensive factory repair information. |
| Competitive Analysis | |
| Value Proposition: | Inexpensive way to maintain and repair the vehicle; avoids costly dealership labor. |
| Key Features | |
| Completeness: | COMPLETE official full factory service repair manual, covering ALL STYLES. |
| Format Flexibility: | Printable in its entirety or only the needed pages; digital download convenience. |
| Manual Details | |
| Coverage Areas | |
| Applicable Years: | 1968, 1969, 1970, 1971, 1972 |
| Regions Covered: | Global (factory specifications) |
| Page Count | |
| Estimated Page Count: | Hundreds (specific number not provided, but described as comprehensive) |
| Manual Type | |
| Manual Type: | Workshop Service Repair Manual |
| Language | |
| Language: | English |
| Format | |
| File Format: | |
| Manual Coverage | |
| Systems Covered | |
| Engine Service Repair: | Complete engine overhaul, internal components, timing, valve train, lubrication system, cooling system. |
| Fuel Injection System: | Bosch D-Jetronic system diagnostics, calibration, component testing, and repair. |
| Fuel System: | Fuel tank, fuel pump, fuel lines, fuel filter replacement and inspection. |
| Transmission Service Repair: | Manual and automatic transmission overhaul, clutch service, driveshaft, and differential. |
| Brake System: | Front disc brakes, rear drum brakes, hydraulic system, parking brake, fluid replacement, and bleeding procedures. |
| Electrical System: | Complete electrical system diagnosis, starter, alternator, battery, ignition system, lighting, and accessories. |
| Wiring Diagrams: | Detailed, color-coded wiring diagrams for all electrical circuits. |
| Suspension System: | Front and rear suspension components, shock absorbers, springs, bushings, and alignment. |
| Steering System: | Steering gearbox, tie rods, steering linkage, power steering system (if equipped). |
| Cooling System: | Radiator, fan, water pump, thermostat, hoses, and coolant specifications. |
| Chassis Body: | Body structure, frame, doors, hoods, trunk, glass, and seals. |
| Interior Systems: | Seats, dashboard, trim panels, HVAC system controls, and upholstery. |
| Restraint Systems: | Seat belts, structural integrity related to occupant safety. |
| Emission Control System: | Component identification and basic maintenance related to emissions. |
| Heater Air Conditioning: | HVAC system components, operation, and basic service. |
| Engine Control System: | Diagnosis and troubleshooting of engine management components. |
| Differential Drive Axle: | Rear axle components, lubrication, and repair. |
| Procedures Included | |
| General Maintenance: | Oil changes, filter replacements, fluid level checks, lubrication points. |
| Troubleshooting: | Diagnostic procedures for common faults and symptoms, fault code interpretation (where applicable). |
| Repair Procedures: | Step-by-step instructions for disassembly, repair, and reassembly of all major components. |
| Component Replacement: | Detailed guidance on replacing parts like alternators, starters, fuel pumps, brake pads, etc. |
| Periodic Lubrication: | Specific lubrication points and recommended lubricants with intervals. |
| Electrical Troubleshooting: | Integrated troubleshooting and electrical service procedures with wiring diagrams. |
| Diagnostic Procedures: | Systematic approaches to identifying and resolving mechanical and electrical issues. |
| Technical Depth | |
| Rebuild Instructions: | Complete disassembly and rebuild instructions for engines, transmissions, and other major units. |
| Diagnostic Capabilities: | Advanced diagnostic techniques for complex systems like fuel injection and electrical faults. |
| Illustration Quality: | Hundreds of photos, detailed illustrations, drawings, and enlarged inset views for clarity. |
| Instructional Format: | Numbered instructions, detailed substeps, notes, cautions, and warnings for critical information. |
| Information Access: | Numbered table of contents for quick information retrieval. |
| Manual Specifications | |
| File Format | |
| File Format: | |
| Compatibility: | Compatible with all PC-based Windows operating systems and Mac. |
| Print Quality | |
| Printability: | Printable without any restriction; individual pages or the entire manual. |
| Digital Delivery: | Download link available on checkout page after payment. |
| Binding Type | |
| Binding Type: | Digital Download (implies printable for physical binding by user) |
| Paper Type | |
| Paper Type: | N/A (Digital product, user prints on desired paper) |
| Software Requirements | |
| Required Software: | Adobe PDF Reader |
| Engine Specifications | |
| Primary Engine | |
| Engine Model: | M114 |
| Engine Configuration: | Inline-6 Cylinder |
| Displacement: | 2496 cc (2.5 Liters) |
| Bore X Stroke: | 82.0 mm x 77.8 mm |
| Compression Ratio: | 8.0:1 or 8.2:1 (depending on market/variant) |
| Performance | |
| Horsepower Net: | Approx. 150 PS (148 hp, 110 kW) at 5600 rpm |
| Torque Net: | Approx. 213 Nm (157 lb-ft) at 3600 rpm |
| Fuel System | |
| Fuel Delivery: | Bosch D-Jetronic Electronic Fuel Injection |
| Fuel Type: | Unleaded gasoline (recommendation for octane rating in manual) |
| Transmission | |
| Standard | |
| Standard Transmission: | 4-speed Manual Transmission |
| Optional | |
| Optional Transmission: | 3-speed Automatic Transmission (e.g., 4G-TRONIC) |
| Features | |
| Clutch Type: | Single dry plate (for manual transmission) |
| Transmission Fluid Spec: | Specific Mercedes-Benz specification (e.g., MB 236.6 for automatic, gear oil for manual - detailed in manual). |
| Dimensions | |
| Exterior | |
| Wheelbase: | 2750 mm (108.3 inches) |
| Length: | 4720 mm (185.8 inches) |
| Width: | 1770 mm (69.7 inches) |
| Height: | 1340 mm (52.8 inches) |
| Weights | |
| Curb Weight: | Approx. 1450-1550 kg (3197-3417 lbs) depending on configuration |
| Gross Vehicle Weight Rating: | Varies by model, typically around 1900-2000 kg |
| Safety Features | |
| Ratings | |
| Crash Test Data: | Era-appropriate safety standards; comprehensive data for this period may be limited but structural integrity is detailed in the manual. |
| Active Features | |
| Braking System: | Power-assisted front disc brakes, rear drum brakes; dual-circuit hydraulic system. |
| Passive Features | |
| Seatbelts: | Standard front seatbelts, often with optional rear seatbelts available. |
| Body Construction: | Integrated body-frame construction offering good structural rigidity for its era. |
| Technology Features | |
| Infotainment | |
| Radio System: | Period-appropriate AM/FM radio, often with an optional cassette player. |
| Driver Assistance | |
| Power Steering: | Optional power steering was available, significantly improving low-speed maneuverability. |
| Connectivity | |
| Vintage Features: | Features like automatic climate control (optional on some trims), power windows (optional), and cruise control (optional) represented the era's advanced technology. |
| Maintenance | |
| Service Intervals | |
| Oil Change Interval: | Typically every 5,000 - 7,500 km (3,000 - 4,500 miles) or 6-12 months, depending on driving conditions. Specifics in manual. |
| Transmission Fluid Change: | Automatic: Every 40,000 - 60,000 km (25,000 - 37,500 miles). Manual: Infrequent, check for leaks. Specifics in manual. |
| Coolant Change Interval: | Typically every 2 years or 40,000 km (25,000 miles). |
| Fluid Specifications | |
| Engine Oil Specification: | API SG or higher (e.g., SAE 10W-40 or 15W-40 depending on climate), with specific Mercedes-Benz approvals mentioned in manual. |
| Brake Fluid Specification: | DOT 3 or DOT 4, depending on the brake system's seal compatibility and original specification. |
| Coolant Specification: | Ethylene glycol-based antifreeze mixed with distilled water (50/50 ratio), meeting Mercedes-Benz specifications. |
| Known Issues | |
| Common Wear Items: | Rubber bushings in suspension and engine mounts, vacuum hoses for ancillary systems, fuel injection system components (especially fuel distributor and injectors), ignition components. |
| Rust Prone Areas: | Wheel arches, rocker panels, door bottoms, trunk floor, and jacking points due to age and materials. |
| Electrical Quirks: | Corrosion on electrical connectors, aging wiring insulation, and malfunctioning vacuum-operated accessories (e.g., central locking, headlight range adjustment). |
| Vehicle History | |
| Brand Heritage | |
| Brand Philosophy: | Mercedes-Benz legacy of engineering excellence, durability, and luxury motoring. |
| Model Evolution | |
| W114 W115 Introduction: | Introduced in 1968 as a replacement for the W110 'Fintail' series, offering a more modern design and improved engineering. |
| W114 Vs W115: | W114 designated for 6-cylinder engines (like the 250C), while W115 was for 4-cylinder engines. |
| Coupe Variant: | The 'C' in 250C denotes the coupe body style, known for its pillarless design and sporty appeal. |
| Production | |
| Production Years: | 1968-1976 (W114/W115 generation) |
| Manufacturing Location: | Germany (primarily Sindelfingen plant) |
| Awards & Recognition | |
| Recognitions | |
| Automotive Press Reviews: | The W114 chassis was widely praised for its build quality, ride comfort, and engineering sophistication upon its release, often considered a benchmark in its class. |
| Ratings | |
| Durability Reputation: | The Mercedes-Benz brand in this era was synonymous with exceptional durability and longevity, making these vehicles highly sought after. |