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Mercedes-Benz 300 1975-1976 Factory Workshop Service Repair Manual
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Basic Information Identification Make: Mercedes-Benz Model: 300 D Chassis Code: W114/W115 Production Years Covered By Manual: 1975-1976 Codes Engine Code: OM615 (typically) Introduction Market Position Vehicle Class: Mid-size luxury sedan...
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SKU: 143791
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| Basic Information | |
| Identification | |
| Make: | Mercedes-Benz |
| Model: | 300 D |
| Chassis Code: | W114/W115 |
| Production Years Covered By Manual: | 1975-1976 |
| Codes | |
| Engine Code: | OM615 (typically) |
| Introduction | |
| Market Position | |
| Vehicle Class: | Mid-size luxury sedan and coupe. |
| Target Audience: | Individuals seeking reliable, durable, and comfortable luxury transportation. |
| Competitive Analysis | |
| Competitors: | BMW 3 Series (E21), Audi 100, Volvo 240 Series, Jaguar XJ6. |
| Key Features | |
| Engineering Philosophy: | Mercedes-Benz's renowned build quality, safety, and engineering excellence. |
| Durability: | Known for exceptional longevity and robust construction, particularly the diesel variants. |
| Manual Value: | Provides factory-level insight, crucial for maintaining and repairing these classic vehicles. |
| Manual Details | |
| Coverage Areas | |
| Primary Coverage: | Comprehensive service and repair |
| Secondary Coverage: | Maintenance, diagnostics, and troubleshooting |
| Page Count | |
| Estimated Page Count: | Extensive (typically 1000+ pages for a full factory manual) |
| Manual Type | |
| Type: | Factory Workshop Service Repair Manual |
| Language | |
| Language: | English |
| Format | |
| Digital Format: | HTML/Flash menu with PDF files |
| Compatibility: | Windows (95/98/ME/XP/Vista/7), Linux, MAC |
| Manual Coverage | |
| Systems Covered | |
| Engine: | Detailed overhaul, tuning, fuel system, cooling system, lubrication system, ignition system (where applicable for diesel), exhaust system. |
| Transmission: | Manual and automatic transmission service, repair, fluid changes, and adjustments. |
| Brakes: | Hydraulic system, disc and drum brake service, parking brake, master cylinder, wheel cylinders, brake lines, troubleshooting. |
| Suspension: | Front and rear suspension components, shock absorbers, springs, bushings, alignment procedures, troubleshooting. |
| Steering: | Steering gear, power steering system, tie rods, steering linkage, troubleshooting. |
| Electrical System: | Wiring diagrams, battery, charging system (alternator), starting system (starter), lighting, instrumentation, fuses, relays, troubleshooting. |
| Body: | Exterior trim, body panels, doors, hood, trunk, glass, interior components, seats, upholstery, HVAC system. |
| Chassis: | Frame, body mounting, driveline, rear axle, driveshaft, universal joints. |
| Procedures Included | |
| Maintenance: | Oil changes, filter replacements, fluid checks and top-offs, lubrication, tune-ups, spark plug replacement (if applicable to gasoline variants), glow plug service (diesel). |
| Repair: | Complete engine rebuilds, transmission overhauls, brake system repairs, suspension component replacement, electrical component repair, body panel repair. |
| Diagnostics: | Troubleshooting guides for common issues, diagnostic charts, fault finding procedures. |
| Technical Depth | |
| Depth: | Extremely high; covers basic maintenance to complete component overhauls and rebuilds, suitable for professional technicians and advanced DIYers. |
| Manual Specifications | |
| File Format | |
| Primary File Type: | |
| Navigation: | HTML/Flash menu for easy access to PDF sections. |
| Print Quality | |
| Printability: | Printable pages (user-dependent on printer capabilities). |
| Binding Type | |
| Binding: | Digital (N/A for physical binding) |
| Paper Type | |
| Paper Type: | Digital (N/A for physical paper type) |
| Engine Specifications | |
| Primary Engine | |
| Engine Type: | Inline 4-cylinder Diesel (OM615 series) |
| Displacement: | 2.4 Liters (2404 cc) |
| Bore X Stroke: | 87.0 mm x 100.0 mm (typical) |
| Compression Ratio: | 21.0:1 (typical for OM615) |
| Horsepower Net: | Approx. 70-75 hp @ 4000 rpm (varies slightly by year and specific tune) |
| Torque Net: | Approx. 108-112 lb-ft @ 2400 rpm (varies slightly) |
| Fuel System | |
| Fuel Type: | Diesel fuel |
| Injection System: | Bosch inline injection pump with mechanical governors. |
| Intake: | Naturally aspirated |
| Performance | |
| 0-60 Mph: | Approx. 17-19 seconds (for diesel variant) |
| Transmission | |
| Standard | |
| Type: | 4-speed manual transmission |
| Optional | |
| Type: | Optional 4-speed automatic transmission (e.g., 'Slick Shift') |
| Features | |
| Gear Ratios: | Detailed in manual, specific ratios vary by transmission type. |
| Fluid Type: | Refer to manual for specific ATF or manual transmission fluid specifications (e.g., MB spec 236.2 for manual, 236.6 for automatic). |
| Dimensions | |
| Exterior | |
| Wheelbase: | 2750 mm (108.3 in) |
| Length: | 4765 mm (187.6 in) |
| Width: | 1750 mm (68.9 in) |
| Height: | 1430 mm (56.3 in) |
| Weights | |
| Curb Weight: | Approx. 1450-1550 kg (3197-3417 lbs) depending on configuration. |
| Gross Vehicle Weight: | Refer to VIN plate and manual for exact specification. |
| Safety Features | |
| Ratings | |
| Crash Test Performance: | Designed to meet rigorous safety standards of its era, focusing on passive safety features. Official ratings from modern agencies may not be directly applicable but represent a benchmark for its time. |
| Active Features | |
| Brakes: | Four-wheel disc brakes on many models, dual-circuit hydraulic system. |
| Passive Features | |
| Body Construction: | Reinforced safety cage, crumple zones, padded interior surfaces. |
| Steering Column: | Collapsible steering column. |
| Seat Belts: | Standard front seat belts, often lap/shoulder combination. |
| Technology Features | |
| Infotainment | |
| Radio: | Factory-optional AM/FM radio, often with cassette player in later years or aftermarket upgrades. |
| Driver Assistance | |
| Cruise Control: | Optional on some models. |
| Connectivity | |
| Central Locking: | Optional vacuum-operated central locking system. |
| Comfort Features | |
| Air Conditioning: | Optional factory-installed or dealer-installed air conditioning system. |
| Power Windows: | Optional power windows. |
| Maintenance | |
| Service Intervals | |
| Oil Change Interval: | Typically 3,000-5,000 miles or 6 months, whichever comes first (consult manual for precise diesel spec). |
| Filter Replacement: | Oil filter, fuel filter, air filter as per service intervals in manual. |
| Transmission Fluid Change: | Automatic: 20,000-30,000 miles or as per manual. Manual: much longer intervals or as needed. |
| Fluid Specifications | |
| Engine Oil Type: | API CD or CE rated diesel engine oil, SAE 10W-40 or 15W-40 recommended (check manual for specific viscosity based on climate). |
| Coolant Type: | Ethylene glycol-based antifreeze, typically a 50/50 mix with distilled water (Mercedes spec 325.0 or equivalent). |
| Brake Fluid Type: | DOT 3 or DOT 4 brake fluid (consult manual for exact specification). |
| Known Issues | |
| Common Wear Items: | Rubber hoses and bushings (due to age), vacuum lines for central locking/accessories, glow plug reliability, injection pump maintenance, front suspension components (ball joints, tie rod ends). |
| Diesel Specific Concerns: | Injector pump seals, carbon buildup in intake manifold and exhaust ports, potential for cylinder head gasket issues if overheated. |
| Part Numbers | |
| Oil Filter Example: | e.g., Mann-Filter W 114/1 or equivalent OEM part number (consult manual). |
| Fuel Filter Example: | e.g., Mann-Filter WK 80 or equivalent OEM part number (consult manual). |
| Vehicle History | |
| Brand Heritage | |
| Philosophy: | Mercedes-Benz has a long-standing reputation for engineering, quality, and safety since its inception. |
| Model Evolution | |
| W114/W115 Introduction: | Introduced in 1968 as a completely new design, replacing the W110 'Fintail' models. W114 designated for 6-cylinder engines, W115 for 4-cylinder engines. The 300 D falls into the W115 designation. |
| Facelift: | Received a significant facelift in 1973, which included updated styling (larger grille, revised headlights), improved interior, and mechanical refinements. The 1975-1976 models are part of this post-facelift generation. |
| Production | |
| Production Period: | 1968-1976 (for W114/W115 series) |
| Manufacturing Locations: | Primarily Germany, with production also occurring in other global facilities under license or direct manufacturing. |
| Awards & Recognition | |
| Recognitions | |
| Industry Acclaim: | The W114/W115 series received critical acclaim for its robust engineering, safety features, and luxurious ride quality, solidifying Mercedes-Benz's reputation in the luxury segment. |
| Ratings | |
| Reliability Perception: | Consistently ranked among the most reliable vehicles of their era, especially the diesel models, often exceeding 500,000 miles with proper maintenance. |
| Certifications | |
| Manual Quality: | Factory-produced documentation, meeting Mercedes-Benz's stringent internal standards for technical accuracy and completeness. |