1968-1976 Mercedes-Benz W114/W115 Workshop Service Repair Manual Best

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Basic Information Identification Make: Mercedes-Benz Model: W114/W115 Generation Generation Name: Stroke-8 (Neue Klasse) Generation Years: 1968-1976 Codes Chassis Code: W114 (6-cylinder), W115 (4-cylinder) Introduction Market Position Positioning: The W114/W115 series,...

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Description

Basic Information
Identification
Make:	Mercedes-Benz
Model:	W114/W115
Generation
Generation Name:	Stroke-8 (Neue Klasse)
Generation Years:	1968-1976
Codes
Chassis Code:	W114 (6-cylinder), W115 (4-cylinder)

Introduction
Market Position
Positioning:	The W114/W115 series, also known as the 'Stroke-8' or 'Neue Klasse', represented Mercedes-Benz's entry into the mid-size luxury sedan market, offering a balance of robust engineering, comfort, and reliability, becoming a global success.
Competitive Analysis
Competitors:	Competed against vehicles like the BMW E116/E12, Audi 100, and Citroën DS in its respective market segments.
Key Features
Distinguishing Features:	Monocoque construction (a first for Mercedes-Benz in this class), excellent ride comfort, robust drivetrain options (including the durable OM615/OM616 diesels), and a timeless design.

Manual Details
Coverage Areas
Primary Coverage:	Workshop Service and Repair
Page Count
Estimated Page Count:	Extensive (typical workshop manuals of this era are 500+ pages)
Manual Type
Type:	Digital Workshop Service Repair Manual
Language
Language:	English
Format
Format:	PDF, HTML (downloadable)

Manual Coverage
Systems Covered
Engine Mechanical:	Detailed procedures for engine disassembly, inspection, and reassembly, including torque specifications and clearances.
Engine Lubrication:	Covers oil pump, oil cooler, oil filter, lubrication passages, and oil pressure testing.
Engine Cooling:	Radiator, water pump, thermostat, coolant passages, fan operation, and pressure testing.
Engine Control:	Ignition system (points, condenser, coil, distributor), carburetion (Stromberg, Zenith, Solex depending on model), and fuel injection (Bosch D-Jetronic for some models).
Fuel System:	Fuel tank, fuel pump (mechanical/electric), fuel lines, filters, and carburetor/injection system maintenance and adjustment.
Exhaust System:	Exhaust manifolds, pipes, mufflers, catalytic converters (if applicable for later models), and mounting hardware.
Clutch:	Clutch disc, pressure plate, release bearing, flywheel, and hydraulic clutch system components and bleeding.
Manual Transmission:	Gearbox disassembly, rebuild, shifting mechanisms, and lubricant specifications.
Automatic Transmission:	Hydraulic control systems, torque converter, planetary gear sets, valve body, and fluid specifications for models like the 722.X series.
Front Axle:	Suspension components (control arms, ball joints, bushings), steering knuckles, wheel bearings, and alignment specifications.
Rear Axle:	Differential housing, drive shafts, U-joints, rear wheel bearings, and axle lubrication.
Front Suspension:	Independent front suspension design, shock absorbers, coil springs, sway bars, and mounting components.
Rear Suspension:	Semi-trailing arm rear suspension (W114/W115), shock absorbers, coil springs, bushings, and alignment.
Road Wheels And Tires:	Wheel specifications, tire pressure recommendations, and wheel alignment procedures.
Brake System:	Hydraulic disc brakes (front) and drum brakes (rear) or optional all-around discs, master cylinder, brake lines, calipers, wheel cylinders, and rotor/pad specifications.
Parking Brake:	Parking brake mechanism, cables, and adjustment procedures.
Brake Control System:	Brake booster (if equipped) operation and testing, proportioning valves.
Power Steering:	Hydraulic power steering system components (pump, steering box, hoses), fluid type, and troubleshooting.
Steering System:	Steering box, steering column, tie rods, and steering linkage components.
Seat Belts:	Installation, maintenance, and adjustment of seat belt systems.
Srs:	Not applicable for this generation; Supplemental Restraint Systems (airbags) were not standard or widely available.
Body Lock Security:	Door locks, ignition lock, trunk lock mechanisms, and key systems.
Glasses Windows Mirrors:	Window regulators, seals, door glass, windshield, rear window, and mirror installation and adjustment.
Roof:	Headliner, sunroof mechanisms (if equipped), and roof panel maintenance.
Exterior Interior:	Body trim, bumpers, interior panels, dashboard, seats, and carpeting.
Instrument Panel:	Gauges, warning lights, dashboard disassembly, and repair.
Air Conditioning:	Components of the A/C system (compressor, condenser, evaporator, blower), refrigerant types (R12 for this era), and system servicing.
Wiring Diagrams:	Comprehensive, high-quality electrical wiring diagrams for all vehicle systems, essential for diagnostics.
Starting Charging:	Starter motor, battery, alternator/generator operation, and testing.
Lighting System:	Headlights, taillights, turn signals, interior lighting, and bulb specifications.
Driver Information:	Instrument cluster functions, warning lamps, and trip computer (if equipped on later models).
Wiper Washer Horn:	Wiper motor, linkages, washer pump, and horn operation.
Body Control System:	Relays, fuses, and basic body electrical control modules (limited compared to modern vehicles).
Lan System:	Not applicable; Local Area Network systems were not present in vehicles of this era.
Audio Visual Navigation Telephone:	Radio installation and basic troubleshooting, early cassette players (optional).
Auto Cruise Control:	Operation and troubleshooting for optional cruise control systems.
Power Supply Ground Circuit Elements:	Battery management, grounding points, circuit protection (fuses, circuit breakers).
Procedures Included
Preventative Maintenance:	Regular service checks, fluid changes, filter replacements, lubrication points.
Troubleshooting:	Systematic diagnostic procedures for common and uncommon faults, symptom-based fault finding.
Repair Rebuild:	Step-by-step instructions for component removal, overhaul, and reinstallation for all major vehicle systems.
Refurbishment Restoration:	Guidance on restoring original specifications, replacing worn components, and addressing age-related deterioration.
Technical Depth
Depth:	Comprehensive; covers from basic adjustments to complete engine and transmission rebuilds, including detailed electrical schematics and torque values.

Manual Specifications
File Format
File Type:	PDF
Print Quality
Image Quality:	High Quality Photos, Illustrations And Diagrams. Assumed to be clear and legible for printing.
Binding Type
Binding:	Digital Download (Not physically bound)
Paper Type
Paper Type:	Digital (printable on standard paper)

Engine Specifications
Primary Engine
Engine Variants Covered:	2.2L Inline-4 (M115), 2.0L Diesel Inline-4 (OM615), 2.4L Diesel Inline-4 (OM616), 2.5L Inline-6 (M114), 2.8L Inline-6 (M110), 3.0L Diesel Inline-5 (OM617).
Performance
Typical Horsepower Range:	Ranging from approximately 70 hp for the 220D to 130 hp for the 280/280C models. Specific output varied by year and emissions regulations.
Fuel System
Carburetor Types:	Stromberg 175CDT, Zenith 35/40 INAT, Solex 40 PDIT.
Fuel Injection Type:	Bosch D-Jetronic mechanical fuel injection for some gasoline models (e.g., 280E, 280CE).

Transmission
Standard
Standard Transmission:	4-speed manual transmission was standard on many models. 5-speed manual was optional on later models.
Optional
Optional Transmission:	3-speed automatic transmission (e.g., 722.1) was a popular option, particularly on higher-spec models.
Features
Transmission Features:	Robust and durable transmissions, with clear procedures for fluid changes and seal replacement.

Dimensions
Exterior
Body Styles:	4-door Sedan (W114/W115), 2-door Coupe (C114/C115).
Wheelbase:	W114/W115: 2710 mm (106.7 in)
Weights
Curb Weight Range:	Approximately 1400-1600 kg (3100-3500 lbs) depending on engine and options.

Safety Features
Ratings
Crash Test Info:	Vehicle safety standards of the era were different; crash test ratings as understood today were not prevalent. Focus was on passive safety features inherent in Mercedes-Benz engineering.
Active Features
Active Safety:	Four-wheel disc brakes (on some models), power steering, advanced suspension geometry for its time.
Passive Features
Passive Safety:	Collapsible steering column, reinforced safety cage, padded dashboard, and seat belts. Robust body structure.

Technology Features
Infotainment
Infotainment Features:	Primarily AM/FM radio (optional cassette players available), analog gauges.
Driver Assistance
Driver Assistance Systems:	Optional cruise control. No electronic driver assistance systems (ABS, traction control, etc.) as understood today.
Connectivity
Connectivity Features:	No modern connectivity features like Bluetooth or USB. Original connectivity was limited to analog radio signals.

Maintenance
Service Intervals
Oil Change Interval:	Typically every 5,000-10,000 km (3,000-6,000 miles) or annually, depending on driving conditions and oil type used. Consult manual for precise intervals.
Tune Up Interval:	Points and condenser replacement, spark plug replacement, and ignition timing adjustment typically every 15,000-25,000 km (10,000-15,000 miles).
Fluid Specifications
Engine Oil Type:	SAE 10W-30 or 10W-40 (API SE/SF or equivalent for gasoline engines); SAE 15W-40 or 20W-50 for diesel engines. Consult manual for exact viscosity and API ratings.
Coolant Type:	Ethylene glycol based antifreeze mixed with distilled water (50/50 ratio).
Transmission Fluid:	Manual: SAE 75W-90 or 80W-90 GL-4 gear oil. Automatic: Dexron II (or equivalent) for 722.X transmissions.
Known Issues
Common Wear Items:	Kingpins, ball joints, control arm bushings, vacuum lines (prone to cracking), fuel lines (rubber), exhaust system components, and carburetor diaphragm issues.
Common Diesel Issues:	Glow plug reliability, injection pump seals, and the tendency for early OM615/OM616 engines to be somewhat underpowered if not well-maintained.

Vehicle History
Brand Heritage
Heritage:	Mercedes-Benz has a long-standing reputation for engineering excellence, safety, and longevity, which the W114/W115 series upheld.
Model Evolution
Evolution Summary:	Introduced as the 'Neue Klasse' (New Class), it was a significant departure for Mercedes-Benz, aiming for a more modern and accessible luxury segment. It evolved through engine updates and minor styling tweaks during its production run.
Production
Production Years:	1968-1976
Production Locations:	Germany (primarily Sindelfingen), with assembly plants in other countries as well.

Awards & Recognition
Recognitions
Historical Accolades:	While specific 'awards' are not commonly documented for individual vehicle models of this era, the W114/W115 series was widely praised for its engineering, durability, and comfort, contributing significantly to Mercedes-Benz's reputation for quality and luxury in the global market.