1972 Mercedes W114 and W115 Service and Repair Manual

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Basic Information Identification Make: Mercedes-Benz Model: W114 / W115 Year: 1972 Codes Chassis Code W114: W114 Chassis Code W115: W115 Introduction Market Position Positioning: Essential resource for owners and independent...

Type: Cars

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Sku: 165081

Tags: Mercedes W115

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Description

Basic Information
Identification
Make:	Mercedes-Benz
Model:	W114 / W115
Year:	1972
Codes
Chassis Code W114:	W114
Chassis Code W115:	W115

Introduction
Market Position
Positioning:	Essential resource for owners and independent mechanics seeking authentic, detailed repair information for classic Mercedes-Benz vehicles.
Competitive Analysis
Advantage:	Offers vehicle-specific, factory-level detail, unlike generic repair guides, ensuring accuracy and efficiency in maintenance and repair.
Key Features
Key Features List:	Step-by-step instructions, diagrams, illustrations, wiring schematics, specifications, comprehensive A-Z coverage, digital format for ease of use and portability.
Ease Of Use:	Combines all necessary information into a single, easily navigable PDF, eliminating the need to consult multiple physical volumes.

Manual Details
Coverage Areas
Primary Coverage:	Service and Repair
Model Coverage:	All W114 and W115 models for 1972
Page Count
Estimated Page Count:	Not specified, but described as comprehensive 'everything you will ever need'
Manual Type
Type:	Factory-level Service and Repair Manual
Additional Manual Types Covered:	Implied coverage for diagnostic, maintenance, and repair procedures. Could also be considered a workshop manual.
Language
Language:	English
Format
Format:	Digital (PDF)
Digital Benefit:	Easy to search, bookmark, and print specific sections; avoids wear and tear of physical manuals.

Manual Coverage
Systems Covered
Engine:	Detailed coverage including maintenance, repair, diagnosis, and specifications.
Fuel System:	Service and repair of fuel injection (Bosch) and carbureted systems (where applicable), fuel pump, lines, and tank.
Cooling System:	Radiator, fan, water pump, thermostat, coolant specifications, and leak detection.
Lubrication System:	Oil pump, filter, oil specifications, capacity, and lubrication points.
Ignition System:	Distributor, coil, spark plugs, timing, and troubleshooting.
Charging System:	Alternator, voltage regulator, battery, and charging circuit diagnostics.
Transmission Automatic:	Service, repair, adjustments, and fluid specifications for the automatic transmission.
Transmission Manual:	Service, repair, and adjustments for the manual transmission.
Drivetrain:	Propeller shaft, universal joints, differential, axles, and wheel bearings.
Suspension Front:	Independent front suspension, control arms, ball joints, springs, shock absorbers, and alignment.
Suspension Rear:	Semi-trailing arm rear suspension, shock absorbers, springs, and bush replacement.
Steering:	Steering box, linkages, power steering system (if equipped), column, and wheel.
Brakes Hydraulic:	Master cylinder, brake lines, calipers/wheel cylinders, pads/shoes, fluid specifications, and bleeding procedures.
Brakes Parking:	Parking brake mechanism, cables, and adjustments.
Wheels Tires:	Tire sizes, inflation pressures, wheel specifications, and hub maintenance.
Electrical System:	Comprehensive coverage of wiring, lights, switches, gauges, and auxiliary components.
Lighting System:	Headlights, taillights, interior lights, and bulb specifications.
Instrument Panel:	Gauges, warning lights, and instrument cluster removal/repair.
Body Exterior:	Door mechanisms, window regulators, hood and trunk latches, exterior trim, and glass replacement.
Body Interior:	Seat adjustment and removal, upholstery, door panels, and dashboard components.
HVAC:	Air conditioning system (if equipped) service, refrigerant, and blower motor.
Wiper Washer:	Wiper motor, linkage, blades, and washer system operation.
Cruise Control:	Service and diagnosis of the cruise control system.
Emission Control:	Details on emission control systems relevant to 1972 models.
Control System:	Engine control systems (ignition timing, fuel delivery), transmission control, and chassis systems.
Mechanical:	Comprehensive mechanical system coverage across engine, transmission, drivetrain, suspension, and brakes.
Intake Exhaust Cooling:	Detailed procedures for intake manifold, exhaust system, and cooling system components.
Supplemental Restraint System:	N/A (No SRS systems in this era)
Seat Belt:	Installation, adjustment, and maintenance of seat belts.
Engine Immobilizer:	N/A (No engine immobilizer systems in this era)
Meter Audio Visual:	Instrument cluster, gauges, and any factory-installed audio systems.
Horn:	Horn circuit diagnosis and repair.
Windshield Glass Mirror:	Windshield, side glass, rear glass, and mirror replacement and adjustment.
Engine Hood Door:	Hood and door latch mechanisms, hinges, and alignment.
Multiplex Can Communication:	N/A (These communication protocols were not in use during this era).
Procedures Included
Maintenance Procedures:	Regular maintenance tasks, fluid changes, lubrication, filter replacements.
Diagnosis Troubleshooting:	Systematic troubleshooting guides for common problems and diagnostic procedures.
Repair Rebuild:	Step-by-step instructions for component removal, repair, and reassembly.
Installation:	Instructions for installing new or reconditioned parts.
Adjustments:	Specific procedures for adjusting various systems, e.g., carburetor, ignition timing, brakes.
Wiring Schematics:	Complete and detailed wiring schematics for all electrical systems, crucial for diagnosis and repair.
Technical Depth
Depth:	Factory-level, covering routine maintenance to complete engine and transmission overhauls, including detailed diagnostics and electrical schematics.

Manual Specifications
File Format
Compatibility:	Windows Vista 32/64, XP, ME, 98, NT, 2000, and Mac OS.
Requirements:	Adobe PDF Reader and Winzip (free online).
Print Quality
Printability:	All pages are printable, with the ability to enlarge images.
Binding Type
Binding Description:	Digital format (PDF) eliminates physical binding issues; print-on-demand for specific pages.
Paper Type
Paper Type Description:	N/A (Digital format); printed pages can be on any desired paper type.

Engine Specifications
Primary Engine W115
Engine Family W115:	M115 (Inline 4-cylinder petrol) and OM615 (Inline 4-cylinder diesel)
Primary Engine W114
Engine Family W114:	M114 (Inline 6-cylinder petrol) and OM617 (Inline 5-cylinder diesel, often found in later W115 models but may apply to some W114 variants)
Performance Petrol W114 230
Engine Displacement 2.3L:	2306 cc
Horsepower 230:	Approx. 118-120 hp (DIN)
Performance Petrol W115 200
Engine Displacement 2.0L:	1988 cc
Horsepower 200:	Approx. 95 hp (DIN)
Performance Diesel W115 220D
Engine Displacement 2.2L Diesel:	2197 cc
Horsepower 220D:	Approx. 60 hp (DIN)
Fuel System
Fuel Delivery Petrol:	Bosch D-Jetronic fuel injection (230.6, 250, 250C, 250CE) or Solex/Zenith carburetors (200, 220)
Fuel Delivery Diesel:	Bosch inline injection pump
Engine Oil
Oil Viscosity Recommended:	Varies by climate, typically SAE 10W-40 or 15W-40 for diesel, 20W-50 or 10W-40 for petrol (consult manual for precise specs).
Oil Capacity 4 Cyl:	Approx. 4.5 - 5.0 liters (with filter)
Oil Capacity 6 Cyl:	Approx. 6.0 - 6.5 liters (with filter)

Transmission
Standard
Standard Transmission Type:	4-speed or 5-speed manual transmission
Optional
Optional Transmission Type:	4-speed automatic transmission (optional)
Features
Automatic Transmission Features:	Hydraulic torque converter, selector positions (P, R, N, D, 2, 1).
Fluid Specifications
Automatic Transmission Fluid Type:	Dexron II or equivalent (check manual for exact specification).
Manual Transmission Fluid Type:	Hypoid gear oil, API GL-4, SAE 80W-90 (check manual for exact specification).

Dimensions
Exterior W114 Sedan
Length W114 Sedan:	Approx. 4740 mm (186.6 in)
Exterior W115 Sedan
Length W115 Sedan:	Approx. 4710 mm (185.4 in)
Exterior Width
Width All Models:	Approx. 1750 mm (68.9 in)
Exterior Height
Height Sedan:	Approx. 1420 mm (55.9 in)
Wheelbase
Wheelbase All Models:	Approx. 2710 mm (106.7 in)
Weights
Curb Weight Approx:	1350 - 1500 kg (2976 - 3307 lbs), depending on engine and equipment

Safety Features
Ratings
Safety Ratings Era:	Designed to contemporary safety standards of the early 1970s. Comprehensive crash test data from this era is limited by modern standards.
Active Features
Active Safety Features:	Four-wheel disc brakes (standard on W114, optional/standard on some W115 models), independent suspension, effective steering system.
Passive Features
Passive Safety Features:	Reinforced passenger cell, safety steering column, padded dashboard, laminated windshield.

Technology Features
Infotainment
Infotainment System:	Basic car radio (AM/FM, optional with cassette), manual antenna operation.
Driver Assistance
Driver Assistance Features:	Primarily limited to effective braking and steering systems. Cruise control was an optional addition.
Connectivity
Connectivity Features:	N/A

Maintenance
Service Intervals Oil
Oil Change Interval:	Typically every 5,000 - 7,500 km (3,000 - 4,500 miles) or annually, depending on driving conditions (consult manual).
Service Intervals Filters
Filter Replacement Interval:	Oil filter with every oil change; air filter and fuel filter every 15,000 - 30,000 km (9,000 - 18,000 miles) or as specified.
Service Intervals Tune Up
Tune Up Frequency:	Spark plugs, ignition timing, and carburetor/fuel injection adjustments typically every 15,000 - 30,000 km (9,000 - 18,000 miles).
Fluid Specifications
Coolant Type:	Ethylene glycol based antifreeze mixed with distilled water (50/50 ratio recommended), compatible with Mercedes-Benz specifications of the era.
Brake Fluid Type:	DOT 3 or DOT 4 glycol-based brake fluid (check manual for exact specification).
Known Issues
Common Issues List:	Carburetor wear and tuning issues, fuel distributor problems (D-Jetronic), vacuum leak diagnosis, aging rubber components (hoses, bushings), rust in common areas, potential for Mercedes-Benz specific electrical gremlins. The manual is crucial for diagnosing and addressing these.

Vehicle History
Brand Heritage
Mercedes Benz Heritage:	Reputation for engineering excellence, durability, and build quality, established through decades of automotive innovation.
Model Evolution
W114 W115 Lineage:	Introduced in 1968, succeeding the W108/W109 and W110/W111 'Fintail' models. Represented a significant step in Mercedes-Benz's mid-size and executive car offerings, known for their robustness and refinement. The W114 designation was for the six-cylinder models, while W115 was for the four-cylinder models. The 1972 models represent a mid-cycle update with minor styling and feature enhancements.
Production
Production Period:	1968-1976
Production Locations
Manufacturing Sites:	Primarily Germany (Sindelfingen, Bremen), with assembly plants in other international locations.

Awards & Recognition
Recognitions
Industry Recognition:	The W114/W115 series was widely praised for its build quality, comfort, and durability, contributing significantly to Mercedes-Benz's reputation as a manufacturer of reliable, long-lasting vehicles.