Mercedes Benz W114 250C 1968-1972 Service Repair Manual

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The Mercedes-Benz W114 250C, produced from 1968 to 1972, represents the first generation of this esteemed model line. This coupe variant, built upon the W114 chassis code, features a robust...

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Sku: 157641

Tags: 1968 1969 1970 1971 1972 Car Cars Mercedes Mercedes-benz W114 W114 250C

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Description

The Mercedes-Benz W114 250C, produced from 1968 to 1972, represents the first generation of this esteemed model line. This coupe variant, built upon the W114 chassis code, features a robust M114 Inline-6 gasoline engine with overhead cam design and a displacement of 2496 cc. Known for its pillarless door design and sporty aesthetic, the 250C embodies Mercedes-Benz's legacy of engineering excellence, durability, and luxury motoring. Its advanced features for the era, including the Bosch D-Jetronic fuel injection system and optional power steering, contributed to its reputation as a sophisticated and reliable automobile. This comprehensive workshop service repair manual, written in English, provides in-depth guidance for the Mercedes-Benz W114 250C models from 1968 to 1972. It covers all essential aspects of maintenance, diagnosis, and repair, including complete engine overhaul, fuel injection system servicing, transmission work for both manual and automatic variants, brake systems, electrical diagnostics with detailed wiring diagrams, suspension, and steering systems. The manual is designed for do-it-yourself enthusiasts and professional mechanics alike, offering hundreds of photos and illustrations to facilitate understanding and execution of procedures, from routine maintenance to complex component rebuilds, ensuring the longevity and optimal performance of your vehicle.

🏷️ 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:

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.