1971 Mercedes W114 and W115 Service and Repair Manual

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Basic Information Identification Make: Mercedes-Benz Model: W114 / W115 Model Years Covered: 1971 Codes Chassis Code: W114 (Sedan/Coupe), W115 (Sedan) Introduction Market Position Market Position: Essential resource for owners and...

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Labels: Mercedes W115

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Description

Basic Information
Identification
Make:	Mercedes-Benz
Model:	W114 / W115
Model Years Covered:	1971
Codes
Chassis Code:	W114 (Sedan/Coupe), W115 (Sedan)

Introduction
Market Position
Market Position:	Essential resource for owners and independent mechanics of 1971 Mercedes-Benz W114/W115 models seeking to maintain, diagnose, and repair their vehicles.
Competitive Analysis
Competitive Analysis:	This manual is presented as the exact same resource used by dealership technicians, offering superior specificity and accuracy compared to generic repair guides.
Key Features
Key Features:	Vehicle-specific, comprehensive A-Z coverage, step-by-step instructions, diagrams, illustrations, wiring schematics, printable pages, digital format for ease of use and preservation.
Target Audience
Target Audience:	Classic Mercedes-Benz owners, DIY mechanics, automotive restoration enthusiasts, and professional workshops specializing in vintage Mercedes-Benz vehicles.

Manual Details
Coverage Areas
Coverage Areas:	All Models & All Repairs A-Z
Page Count
Page Count:	Not Specified (Comprehensive)
Manual Type
Manual Type:	Service and Repair Manual
Language
Language:	English
Format
Format:	PDF
Digital Benefits
Digital Benefits:	Easy searching, zoomable images, printable specific sections, protection from grease and damage compared to paper manuals.
Searchability
Searchability:	PDF format allows for text searching of keywords, enhancing ease of finding specific information.

Manual Coverage
Systems Covered
Systems Covered:	Engine, Control System, Mechanical, Fuel Service Specifications, Emission Control, Intake Exhaust Cooling, Lube, Ignition Starting Charging, Auto Transmission, Clutch, Manual Transmission, Transfer Propeller Shaft, Drive Shaft, Differential, Axle Suspension, Tire & Wheel, Brake Control, Brake, Parking Brake, Steering Column, Power Steering, Air Condition, Suppl Restraint System, Seat Belt, Engine Immobilizer, Cruise Control, Wiper & Washer, Door Lock, Meter Audio/Visual, Horn, Windshield/Glass Mirror, Instrument Panel, Seat, Engine Hood/ Door, Exterior & Interior, Electrical, Multiplex/Can Communication
Procedures Included
Procedures Included:	Maintenance, Service, Diagnosis, Repair, Troubleshooting, Component Replacement, Adjustment, Overhaul
Technical Depth
Technical Depth:	Vehicle Specific, Factory High Detail, Complete Step-by-Step Instructions, Diagrams, Illustrations, Wiring Schematics, Specifications
Electrical Systems
Electrical Systems Covered:	Detailed wiring schematics for all vehicle systems including lighting, ignition, charging, instruments, wipers, horn, radio, power windows (if equipped), and HVAC controls.
Engine Overhaul
Engine Overhaul Procedures:	Complete engine disassembly, inspection, measurement of clearances, piston/ring replacement, bearing replacement, cylinder head repair, valve job, timing chain/gear inspection and replacement, lubrication system overhaul.
Fuel System Repair
Fuel System Repair Procedures:	Carburetor (Zenith/Solex) overhaul and adjustment, fuel pump testing and replacement, fuel line inspection and replacement, fuel tank cleaning and inspection.
Brake System
Brake System Procedures:	Brake pad/shoe replacement, brake disc/drum inspection and replacement, caliper/wheel cylinder overhaul, brake fluid flush and bleeding, brake line inspection and replacement, parking brake adjustment.
Suspension Steering
Suspension Steering Procedures:	Ball joint replacement, tie rod end replacement, shock absorber replacement, spring inspection, power steering pump and gearbox overhaul/adjustment, steering linkage inspection.
Cooling Heating
Cooling Heating Procedures:	Radiator inspection and cleaning, water pump replacement, thermostat replacement, fan clutch inspection, heater core replacement, blower motor repair, coolant hose replacement.
Transmission Repair
Transmission Repair Procedures:	Manual transmission clutch adjustment and replacement, transmission fluid change, automatic transmission fluid change and filter replacement, torque converter inspection, basic troubleshooting of transmission shifting issues.
Diagnostic Procedures
Diagnostic Procedures:	Troubleshooting guides for common problems, checking engine compression, fuel system pressure testing, ignition system diagnostics, electrical system testing using multimeters.
Body And Chassis
Body Chassis Procedures:	Door panel removal, window regulator repair, seat adjustment and repair, trunk lid repair, hood adjustment, bumper replacement, minor body panel repair, rust prevention and treatment guidance.
Climate Control
Climate Control Procedures:	Air conditioning system servicing (charging, leak detection, component replacement), heater blower motor repair, control cable adjustment, defroster system inspection.
Electrical Component Repair
Electrical Component Repair:	Alternator testing and replacement, starter motor testing and replacement, battery charging system diagnostics, headlight and taillight assembly replacement, wiper motor repair, horn repair.
Troubleshooting Guides
Troubleshooting Guides:	Comprehensive guides for diagnosing and resolving issues across all vehicle systems, including no-start conditions, poor performance, electrical faults, and braking problems.

Manual Specifications
File Format
File Format:	PDF
Print Quality
Print Quality:	High Quality, Printable Pages, Enlargable Images
Binding Type
Binding Type:	Digital (PDF) - No physical binding
Paper Type
Paper Type:	N/A (Digital File)
Compatibility
Compatibility:	Windows Vista32/64, XP, ME, 98, NT, 2000; Mac Compatible
Software Requirements
Software Requirements:	Adobe PDF Reader, Winzip (Free Online)

Engine Specifications
Primary Engine
Engine Options 1971:	W114: M114 2.3L (Inline-6), W115: M115 2.0L/2.2L (Inline-4 Gasoline), OM615 2.0L/2.2L (Inline-4 Diesel)
Performance
Typical Horsepower Range:	Gasoline: 95-120 hp; Diesel: 55-65 hp (Model Dependent)
Fuel System
Fuel System Types:	Carbureted (Zenith, Solex), Bosch Mechanical Fuel Injection (for some diesel variants)
Engine Codes
Engine Codes:	M114 (Inline-6 gasoline), M115 (Inline-4 gasoline), OM615 (Inline-4 diesel)
Bore Stroke
Bore Stroke Typical Gasoline:	M115: 87.0 mm x 83.6 mm; M114: 82.0 mm x 72.8 mm
Compression Ratio
Typical Compression Ratio:	Gasoline: 8.0:1 - 9.0:1; Diesel: 21.0:1 - 22.5:1 (Model Dependent)
Valve Train
Valve Train Type:	Overhead Camshaft (OHC) for gasoline engines, Overhead Valve (OHV) for diesel engines (driven by chain or belt depending on specific engine variant).

Transmission
Standard
Standard Transmission Options:	4-speed Manual (floor or column shift), 3-speed Automatic (optional)
Optional
Optional Transmission Options:	4-speed Automatic (later introduced), 4-speed Manual
Features
Transmission Features:	Overdrive gear (on some automatic transmissions), robust construction for the era.
Gear Ratios
Gear Ratios Manual 4Spd:	Refer to manual for specific ratios, typically around 3.65:1 for 1st gear, 2.30:1 for 2nd, 1.47:1 for 3rd, 1.00:1 for 4th. Differential ratios vary.

Dimensions
Exterior
Wheelbase:	W114 Sedan/Coupe: 2720 mm (107.1 in); W115 Sedan: 2720 mm (107.1 in)
Length:	W114 Sedan: Approx. 4750 mm (187.0 in); W115 Sedan: Approx. 4730 mm (186.2 in)
Width:	Approx. 1760 mm (69.3 in)
Height:	Approx. 1430 mm (56.3 in)
Weights
Curb Weight Range:	Approx. 1300-1500 kg (2866-3307 lbs) depending on engine and body style
Gross Vehicle Weight Rating:	Refer to vehicle data plate; typically around 1800-2000 kg (3968-4409 lbs)

Safety Features
Ratings
Safety Ratings:	No formal crash test ratings (as per modern standards) for this era, but designed with Mercedes-Benz's focus on occupant safety for the time.
Active Features
Active Safety Features:	Four-wheel disc brakes (front), drum brakes (rear) on most models, power steering (optional on some), independent front suspension.
Passive Features
Passive Safety Features:	Reinforced passenger cell, safety steering column, padded dashboard (optional), seat belts (standard or optional depending on configuration).

Technology Features
Infotainment
Infotainment Features:	Basic AM/FM radio, optional cassette player. Focus on functionality and durability rather than advanced features.
Driver Assistance
Driver Assistance Features:	Minimal. Primarily mechanical systems like power steering (optional) and automatic transmission. No electronic driver aids.
Connectivity
Connectivity Features:	None (pre-digital era).
Instrument Panel
Instrument Panel Features:	Speedometer, tachometer (optional), fuel gauge, oil pressure warning light, temperature gauge, battery charge indicator, turn signal indicators, high beam indicator.

Maintenance
Service Intervals
Typical Oil Change Interval:	Every 5,000-7,500 km (3,000-4,500 miles) or 6 months, whichever comes first (refer to manual for specific engine and oil type).
Fluid Specifications
Engine Oil Specification:	Refer to manual; typically SAE 10W-30 or 10W-40 for gasoline engines, and specific diesel engine oil for OM615. API service classifications appropriate for the era.
Transmission Fluid Automatic:	Dexron-III or equivalent (refer to manual for exact specification as fluids evolved)
Transmission Fluid Manual:	GL-4 Gear Oil, SAE 75W-90 or 80W-90
Coolant Specification:	Ethylene Glycol based antifreeze mixed with distilled water (50/50 ratio). Refer to manual for specific approvals.
Brake Fluid Specification:	DOT 3 or DOT 4 (Refer to manual for precise recommendation)
Known Issues
Common Issues For Model:	Rusting (especially around wheel wells, door bottoms, and trunk), carburetor tuning issues, vacuum hose degradation, fuel line deterioration, potential for oil leaks, wear on suspension bushings. Diesel engines are generally robust but can have injector issues.
Tune Up Components
Tune Up Components Covered:	Spark plugs, ignition points, condenser, distributor rotor, spark plug wires, fuel filter, air filter, oil filter, PCV valve (if equipped).
Filter Part Numbers
Oil Filter Example Part Number:	Mann Filter W922/1, Mahle OC10, Bosch 0451103027 (These are examples, actual part numbers may vary by specific engine and revision. Manual is definitive.)
Air Filter Example Part Number
Air Filter Example Part Number:	Mann Filter C1510, Mahle LX2, Bosch 1457433013 (Examples, refer to manual.)
Spark Plug Recommendation
Typical Spark Plug Type:	Bosch W10P, Champion N5C (Gasoline engines, refer to manual for specific type and gap)
Lubrication Points
Lubrication Points Covered:	Chassis lubrication points (grease nipples), door hinges, hood latches, steering linkage.

Vehicle History
Brand Heritage
Brand Heritage:	Mercedes-Benz, established in 1926, renowned for engineering excellence, durability, and pioneering automotive innovations.
Model Evolution
Model Evolution:	The W114/W115 series (often called the 'Stroke Eight' due to their introduction in 1968) represented a significant step in Mercedes-Benz's lineup, offering more compact, modern styling and a wider range of engine options than previous models. They established the foundation for Mercedes-Benz's mid-size offerings for decades.
Production
Production Period:	1968-1976
Model Codes Explanation
Model Codes Explanation:	W114: designated for 6-cylinder engines and longer wheelbase; W115: designated for 4-cylinder engines and standard wheelbase. Both shared many components and styling cues.
Manufacturing Locations
Manufacturing Locations:	West Germany (primary)

Awards & Recognition
Recognitions
Recognitions:	While specific awards for the 1971 models are not widely documented in modern terms, the W114/W115 series was critically acclaimed for its build quality, comfort, and reliability, cementing Mercedes-Benz's reputation in the mid-size luxury segment.