Target Audience:
Owners of Mercedes-Benz W123 280S models from 1976-1985 who wish to perform maintenance and repairs themselves, saving on labor costs.
Manual Authenticity:
Actual Genuine Factory Repair Manuals, not third-party publications, ensuring accuracy and completeness.
Benefit Labor Savings:
$50 - $60 per hour savings on shop labor costs by enabling DIY servicing.
Instructional Method:
Step-by-step instructions, detailed illustrations, diagrams, photos, notes, cautions, and warnings to guide users through procedures.
Search Functionality:
Searchable PDF format allows for quick location of specific information.
Digital Convenience:
Downloadable PDF eliminates the need for shipping and waiting for physical copies, offering instant access.
Covered Model Years:
1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985
Covered Trim Levels:
280S (All Styles Covered)
Estimated Page Count:
Hundreds (exact count not specified, but described as 'hundreds of pages')
Manual Type:
Factory Service Repair Manual
File Format:
PDF (Downloadable)
Engine Service Repair:
Detailed procedures for engine maintenance, repair, and overhaul.
Transmission Service Repair:
Comprehensive coverage of automatic and manual transmission maintenance and repair.
Brake System:
Inspection, maintenance, and repair of the hydraulic brake system.
Wiring Diagram:
Detailed electrical wiring diagrams for all vehicle systems.
Electrical System:
Troubleshooting and repair of all electrical components and circuits.
Suspension:
Repair and maintenance of front and rear suspension systems.
Periodic Lubrication:
Guidelines and specifications for lubrication points and intervals.
Steering:
Service and repair of the steering system, including power steering.
Cooling System:
Maintenance and repair of the radiator, thermostat, water pump, and hoses.
Fuel Injection Fuel System:
Detailed information on the fuel delivery and injection system.
Emission System:
Information related to emission control systems and their maintenance.
Heater Air Conditional:
Service and repair of the climate control system.
Engine Control System:
Diagnostics and repair of engine management systems.
Chassis Body:
Body repair, chassis maintenance, and structural information.
Restraint System:
Information on seat belts and other restraint components.
Interior:
Details on interior trim, upholstery, and components.
Differential Drive:
Maintenance and repair of the rear axle and differential.
Axle:
Service procedures for front and rear axles.
General Maintenance:
Routine service and preventative maintenance procedures.
Troubleshooting:
Diagnostic guides and common problem solutions.
Repair Procedures:
Step-by-step instructions for all repair operations.
Rebuild Refurbish Restore:
Comprehensive guidance for major overhauls and restorations.
Diagnostics:
Advanced diagnostic techniques for identifying faults.
Tuning:
Information on engine tuning and performance adjustments.
Depth Of Coverage:
Complete official factory level detail, covering everything from basic maintenance to full rebuilds and diagnostics. Mimics information available to factory-trained technicians.
File Format Details:
PDF, downloadable. Compatible with all PC-based Windows operating systems and Mac. Can be saved to hard drive or burned to CD-ROM.
Printability:
Fully printable without restriction. Users can print individual pages, chapters, or the entire manual.
Binding Type:
N/A (Digital Download - Printable)
Paper Type:
N/A (Digital Download - Printable)
Required Software:
Adobe PDF Reader
Delivery:
Download link provided on checkout page after payment.
Engine Model:
M110 (inline-6 cylinder)
Engine Displacement:
2.8 Liters (2785 cc)
Engine Configuration:
Inline 6-Cylinder, SOHC
Horsepower Approx:
140-155 hp (depending on market and specific year/tuning)
Torque Approx:
165-175 lb-ft (depending on market and specific year/tuning)
Fuel Delivery:
Bosch K-Jetronic (CIS) Fuel Injection
Fuel Type:
Unleaded Gasoline (Octane rating as per Mercedes-Benz specification)
Safety Era Context:
While specific modern crash ratings are not available for this era, the W123 was known for its robust construction and safety features for its time.
Braking System:
Four-wheel disc brakes (front ventilated) with servo assistance, typically ABS optional/later models.
Chassis Construction:
Reinforced safety cage, crumple zones, safety steering column.
Seat Belts:
Front 3-point inertia reel seat belts, rear lap and diagonal belts.
Infotainment System:
Basic: AM/FM Radio, Cassette Player. Optional: Air Conditioning (manual or optional climate control).
ABS:
Anti-lock Braking System (ABS) was an optional feature, particularly on later models.
Connectivity Features:
None (vehicles of this era predate modern connectivity features like Bluetooth or USB).
Oil Change Interval:
Typically every 10,000-15,000 km or 6-12 months, depending on driving conditions (check manual for specific recommendation).
Transmission Fluid Service:
Recommended service interval typically around 50,000-80,000 km for automatic transmissions (refer to manual).
Engine Oil Specification:
MB 228.0, MB 228.1, MB 229.1, or API SG/CD (check manual for exact viscosity and spec for the specific engine variant and climate).
Coolant Specification:
Mercedes-Benz coolant concentrate (e.g., G48 or equivalent) mixed with distilled water, typically 50/50 ratio.
Common Maintenance Items:
Regular maintenance of the fuel injection system (K-Jetronic), vacuum hoses, ignition system, and cooling system are critical for optimal performance and longevity.
Common Wear Items:
Wear of suspension bushings, ball joints, tie rod ends, and fuel lines are common on higher mileage vehicles.
Mercedes Benz Legacy:
Mercedes-Benz has a long-standing reputation for engineering excellence, durability, and luxury. The W123 continued this legacy.
W123 Introduction:
The W123 chassis was introduced in 1976, replacing the W114/W115 'Stroke 8' models. It was praised for its build quality, reliability, and comfort.
W123 Variants:
The W123 series was offered in a wide range of body styles and engine configurations, becoming one of Mercedes-Benz's most successful platforms.
Production Years:
1975-1986 (W123 chassis overall), with 280S production within this range.
Production Locations:
Primarily Germany (e.g., Bremen, Sindelfingen), with some assembly in other countries.
