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 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: PDF 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...
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.
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.