Target Audience:
Professional Mercedes-Benz technicians, independent repair shops, and dedicated enthusiasts/owners with mechanical aptitude.
Comparative Value:
Offers superior technical depth and accuracy compared to generic repair manuals. Directly from Mercedes-Benz or authorized publishers.
Diagnostic Emphasis:
Strong emphasis on systematic troubleshooting and understanding the underlying principles of operation for each system.
Historical Importance:
The W123 chassis is revered for its build quality and durability, making a comprehensive manual essential for long-term preservation.
Manual Type:
Workshop Manual (WSM) / Service and Repair Manual
Format:
Likely a digital format (PDF, digital download) given the listing context, but original was print.
Estimated Page Count:
Comprehensive, typically 500+ pages for full WSMs of this era.
Powertrain:
Engine (M110), Fuel System (Bosch K-Jetronic), Ignition System, Cooling System, Exhaust System, Transmission (Manual & Automatic)
Chassis:
Suspension (Front & Rear), Steering System, Brakes (Hydraulic, Disc/Drum configurations), Drivetrain (RWD, Driveshaft, Differential)
Electrical:
Complete Wiring Diagrams, Lighting System, Starting & Charging System, Instrumentation, HVAC Controls, Power Accessories
Bodywork:
Body Panel Removal/Installation, Interior Trim, Door Mechanisms, Glass Replacement, Seals
Maintenance:
Scheduled Maintenance (Oil Changes, Filter Replacements, Tune-ups), Fluid Checks and Replacements, Belt Adjustments
Troubleshooting:
Diagnostic Procedures for Engine Performance, Electrical Faults, Braking Issues, and other Common Problems; Fault Code Interpretation (where applicable for the era)
Repair:
Step-by-step instructions for component removal, overhaul, and reinstallation (e.g., Engine rebuilds, Transmission overhauls, Brake caliper replacement, Steering box rebuild)
Technical Specifications:
Torque values, P-Codes/Sympt codes for diagnostics, Alignment specifications, Timing settings, Engine clearances
Diagnostic Capabilities:
Advanced diagnostics leveraging mechanical knowledge and basic electrical testing. No OBD-II coverage as it predates the standard.
Overhaul Procedures:
Detailed procedures for complete engine and transmission overhauls, including disassembly, inspection, and reassembly.
Special Tools:
Identification and usage of specialized Mercedes-Benz tools required for specific repairs and adjustments.
Digital Format Notes:
Searchable text, clear illustrations, printable pages.
Original Print Quality:
High-quality, durable paper stock with clear diagrams and photographs.
Original Binding:
Typically case-bound or spiral-bound for ease of use in workshop environments.
Original Paper Type:
Heavy-duty, often glossy paper for illustrations and durability.
Engine Type:
Inline 6-Cylinder, SOHC
Displacement:
2746 cc (2.8 Liters)
Bore X Stroke:
86.0 mm x 79.0 mm
Compression Ratio:
8.0:1 or 8.2:1 (depending on market/variant)
Horsepower Net:
Approx. 136-145 hp @ 5500 rpm (DIN)
Torque Net:
Approx. 217-220 Nm (160-162 lb-ft) @ 3500-4000 rpm (DIN)
Fuel Delivery:
Bosch CIS (Continuous Injection System) / K-Jetronic Mechanical Fuel Injection
Fuel Type:
Unleaded Premium Gasoline (91-93 Octane)
Ignition Type:
Breakerless Electronic Ignition (CDI or similar)
Cooling Type:
Water-cooled
Oil Capacity With Filter:
Approx. 7.5 Liters (8 US Quarts)
Transmission Type:
4-Speed Manual Transmission (often denoted as 717.4)
Transmission Type:
4-Speed Automatic Transmission (722.1)
Automatic Features:
Torque converter, hydraulic control, selector positions (P, R, N, D, 2, 1)
Manual Transmission Fluid:
API GL-4 or GL-5, SAE 75W-90 or 80W-90
Automatic Transmission Fluid:
MB 236.3 specification (e.g., Dexron II)
Length:
Approx. 4730 mm (186.2 in)
Width:
Approx. 1790 mm (70.5 in)
Height:
Approx. 1430 mm (56.3 in)
Wheelbase:
Approx. 2810 mm (110.6 in)
Curb Weight:
Approx. 1450 - 1550 kg (3197 - 3417 lbs), varies by equipment
Crash Test Era:
Pre-dates modern standardized crash testing (NHTSA, Euro NCAP). Safety focused on structural integrity and passive restraint.
Braking System:
Front Ventilated Discs, Rear Discs or Drums (depending on year/market), Hydraulic Power Assist
Steering System:
Recirculating Ball with Power Assist (optional on some early models)
Body Structure:
Reinforced passenger cell, crumple zones, safety door beams
Restraints:
Seat belts (3-point front, 2-point rear typical), padded dashboard and steering wheel
Audio System:
Typically an AM/FM radio with optional cassette player. Analog tuning, basic speaker configuration.
Cruise Control:
Optional, mechanical cruise control system available on some models.
Early Automation:
Power windows, power locks, and climate control (HVAC) were available as options, representing the era's premium features.
Oil Change Interval:
Typically every 5,000 - 7,500 miles or annually, depending on driving conditions and oil quality used.
Filter Replacement:
Oil filter with every oil change. Air filter and fuel filter every 15,000 - 30,000 miles. Spark plugs every 30,000 miles.
Transmission Service:
Automatic transmission fluid and filter service every 30,000 - 50,000 miles. Manual transmission fluid check annually, change every 60,000 miles.
Coolant Change:
Every 2-3 years or 30,000 miles.
Engine Oil:
API SG/SH or ACEA A2/A3 rated, SAE 10W-40 or 15W-40 (check manual for precise recommendation based on climate)
Coolant:
Ethylene Glycol based antifreeze, mixed 50/50 with distilled water.
Brake Fluid:
DOT 3 or DOT 4.
Common Wear Items:
Ball joints, tie rod ends, control arm bushings, flex discs (driveshaft), fuel distributor seals, idle control valve, ignition components.
K Jetronic Quirks:
Sensitivity to vacuum leaks, fuel pressure issues, potential need for injector cleaning or rebuilding.
Body Corrosion:
Prone to rust, especially in common areas like wheel wells, rocker panels, and around window seals. Requires diligent inspection and preventative measures.
Mercedes Benz Legacy:
Renowned for engineering excellence, durability, and luxury from its inception. Established a benchmark for automotive quality.
W123 Introduction:
Introduced in 1976, succeeded the W114/W115 series. The 280E was positioned as a more powerful, refined gasoline variant.
280E Positioning:
Offered a balance of performance and smooth operation from the inline-six engine, targeting executives and discerning buyers.
Production Duration:
1976-1985
Manufacturing Locations:
Various Mercedes-Benz plants globally, primarily in Germany.
Industry Acclaim:
The W123 chassis was widely praised upon release for its durability, comfort, and build quality. Often cited as one of the most over-engineered cars of its time, contributing to exceptional longevity.
Consumer Reputation:
Consistently ranked highly by automotive journalists and owners for its reliability and timeless design, fostering a strong enthusiast following.
