This comprehensive Mercedes 350SD Turbo 1991 Service Repair Manual is your essential guide for maintaining and repairing your vehicle. It covers a wide range of topics, designed to help you diagnose and resolve issues with your car, as well as providing detailed instructions for various maintenance procedures. The manual includes detailed instructions for inspecting the condition of key components, including lines, hoses, suspension systems, body structure, and for identifying signs of water leakage and corrosion. You'll find step-by-step instructions for essential maintenance tasks like engine oil and filter changes, valve clearance adjustments, and fuel filter replacements. In addition to routine maintenance, this manual provides thorough guidance on more complex procedures like adjusting injection timing, replacing spark plugs, checking and replacing cooling system components, and performing fluid changes for the transmission, transfer case, and axles. Further, it covers the braking system, including brake fluid checks, pad and disk inspections, and adjustments of the parking brake. The manual also includes detailed instructions for checking and adjusting steering components, as well as for maintaining and repairing the fuel system, exhaust system, and electrical systems. This manual provides detailed instructions for inspecting and maintaining various features and accessories, including the air conditioning system, heating and ventilation system, windshield wipers, headlights, and safety belts. You'll find thorough guidance on cleaning and lubricating components like door hinges, door locks, and side mirrors, ensuring your car stays in top condition. With its extensive coverage and detailed instructions, this manual is a valuable resource for anyone who wants to maintain and repair their Mercedes 350SD Turbo. Whether you're a seasoned mechanic or a DIY enthusiast, this comprehensive guide will empower you to keep your vehicle running smoothly.

The 1991 Mercedes-Benz 350 SD Turbo, a testament to German engineering excellence, was a flagship diesel sedan that exemplified both luxury and performance. This model was part of the W126 series, known for its robust construction, timeless design, and advanced features for its era. The 350 SD Turbo was powered by a 3.0-liter inline-five-cylinder turbocharged diesel engine, a unit renowned for its smooth operation and impressive torque delivery. This engine, mated to a four-speed automatic transmission, generated a respectable 143 horsepower, allowing the 350 SD Turbo to accelerate with surprising agility for a diesel-powered car of its time. The 350 SD Turbo came equipped with features that set it apart, including air conditioning, power steering, power windows, and a luxurious interior appointed with leather upholstery and wood accents. This combination of performance, comfort, and refinement made the 350 SD Turbo a popular choice for discerning drivers who valued both practicality and prestige. However, the 1991 Mercedes-Benz 350 SD Turbo also inherited some quirks inherent to its age and technology. The injection system, while sophisticated for its time, could be prone to issues if not maintained properly, and the turbocharger system, while powerful, required regular inspection and maintenance to ensure optimal performance. Moreover, the car's complex electrical system, while offering various amenities, could be a source of frustration if components failed. Despite these potential issues, the 350 SD Turbo remained a reliable and durable vehicle, capable of lasting for many years with proper care and attention. The 1991 Mercedes-Benz 350 SD Turbo represented a significant milestone in automotive history, blending the practicality of diesel technology with the luxury and prestige associated with the Mercedes-Benz brand. Today, these vehicles remain sought after by collectors and enthusiasts who appreciate their timeless design, engineering excellence, and unique blend of performance and refinement.