This comprehensive service and repair manual is specifically designed for the 1977-1978 Mercedes-Benz W123 Series 230, covering chassis type 123.023 and engine type 115.954. It provides detailed instructions and illustrations for all aspects of repair and maintenance, empowering you to tackle any project with confidence.

The manual covers a vast array of topics, encompassing everything from routine maintenance and service procedures to in-depth repair information. You'll find detailed explanations for:

* **General Maintenance & Service:** Covers essential topics like technical data, operating instructions, general considerations for service products, jacking-up, towing, and laying-up the vehicle.
* **Engine System:** Delve deep into the engine with sections covering removal and installation, crankcase, cylinder head, engine breathing, crank assembly, engine timing, valves, diesel injection systems, carburetor systems, mechanically and electronically controlled gasoline injection systems, electronically controlled gasoline injection systems, air cleaner, intake air preheater, exhaust gas turbocharger, air compressor, belt drives, intake manifold, exhaust manifold, engine brake, emission control system, electrical system engine (ignition system, preheating system, starter, alternator), engine lubrication, engine oil cooler, engine cooling system, coolant hoses, radiator, and engine mounting.
* **Transmission & Drivetrain:** Provides detailed information on the clutch, manual transmission, power take-offs, automatic transmission, transfer case, pedals, throttle control, and frame.
* **Suspension & Steering:** Explore the intricacies of the suspension system, front axle, rear axle, trailing axle, wheels, chassis measurements, propeller shaft, brakes (hydraulic, mechanical, and pneumatic), and steering system.
* **Fuel & Exhaust Systems:** Covers the fuel system, exhaust system, heat shield, outer, electrical system, equipment and instruments, speed control systems, auxiliary drives, hydraulic and articulated systems, and tools, test instruments, and equipment.
* **Body & Interior:** Get detailed information on the body, general, understructure, front end and front wall, side wall, rear wall and rear end, roof, glass (panes) and windows, interior equipment, doors, trunk lid, fuel flap, slide roof (sun roof), top, racks, electrical system body, radio, windshield washer system, light range regulator, climate control, emergency equipment, sanitary equipment, kitchen, attachments, outside flaps, seats, cots, restraint systems, body noises, sound insulation, body sealing, anti-corrosion protection, paintwork, and technical literature.

This comprehensive manual is your ultimate guide to maintaining, repairing, and restoring your 1977-1978 Mercedes-Benz W123 Series 230. It will help you save money on expensive repair costs and will provide you with the knowledge and confidence to tackle any project yourself.

The 1977-1978 Mercedes-Benz W123 230 is a classic example of German engineering and luxury, embodying a period when Mercedes-Benz was renowned for its robust build quality, timeless design, and unwavering reliability. This compact luxury sedan, part of the W123 series, represented a significant advancement over its predecessor, the W114/115 series. It was the first Mercedes-Benz series to feature a fully galvanized body, offering exceptional corrosion resistance for long-lasting durability. The W123 230's design was a departure from the more rounded curves of the W114/115, adopting clean lines and sharp angles that gave it a distinctive, sophisticated look that has aged gracefully. Power came from a 2.3-liter, four-cylinder engine, offering a balance of performance and fuel efficiency in the era of rising fuel prices.

The 1977-1978 W123 230 was equipped with a host of features that enhanced both driver comfort and safety. A spacious interior with comfortable seating, an intuitive dashboard layout, and a high level of build quality offered a luxurious driving experience. Safety was paramount, with advanced features like crumple zones, anti-lock brakes (ABS) as an optional extra, and a driver-oriented cockpit designed for maximum visibility. The W123 230's solid construction, combined with its well-engineered suspension and steering, provided a smooth and controlled ride, further solidifying its reputation for reliability and longevity. While its relatively small engine may not offer the same level of performance as its larger six-cylinder siblings, the 230 maintained the core values of the W123 series – practicality, elegance, and enduring quality, making it a highly sought-after classic car today.