This comprehensive Mercedes 350 SD Turbo 1991 Service Repair Manual provides detailed instructions for servicing and repairing your vehicle. It covers a wide range of maintenance procedures and repair tasks, empowering you to handle most repairs yourself. The manual encompasses a wide array of essential topics, including: * **Inspection and Maintenance:** Learn how to inspect the condition of various components, lines, and hoses, as well as perform essential maintenance tasks like engine oil and filter changes, adjusting valve clearance, and checking and adjusting idle speed. * **Engine Systems:** Dive into the intricacies of engine systems with detailed instructions on checking and adjusting injection timing, replacing fuel filters, and maintaining the air filtration system. * **Transmission and Drivetrain:** This section guides you through procedures like manual and automatic transmission fluid changes, checking and correcting fluid levels, and inspecting and lubricating the clutch system. * **Suspension and Steering:** Learn how to inspect and maintain your vehicle's suspension system, including self-leveling suspension, axle oil changes, and checking ball joints. * **Brakes and Wheels:** Obtain step-by-step instructions for inspecting and maintaining your braking system, including checking brake fluid levels, inspecting brake lines and pads, and adjusting the parking brake. * **Electrical and Lighting:** Gain insights into troubleshooting electrical components, checking and adjusting battery fluid levels, and inspecting warning and indicator lamps. * **Body and Interior:** This section covers procedures like cleaning water drains, lubricating door hinges and locks, inspecting safety belts, and maintaining the sunroof and soft top. * **Climate Control:** Learn how to maintain your vehicle's heating and ventilation system, including replacing dust filters, active charcoal filters, and recirculating air filters. * **Additional Systems:** The manual also includes instructions for inspecting and maintaining your vehicle's power steering system, fuel system, and exhaust system. This detailed and comprehensive manual serves as your ultimate guide to servicing and repairing your Mercedes 350 SD Turbo, enabling you to perform most maintenance and repair tasks with confidence.

The 1991 Mercedes-Benz 350 SD Turbo was a luxurious and powerful sedan, representing the pinnacle of German engineering at the time. It was part of the W126 model series, known for its robust construction, opulent interiors, and advanced technology. Under the hood, the 350 SD Turbo housed a 3.5-liter OM603 inline five-cylinder turbocharged diesel engine. This engine, renowned for its reliability and long lifespan, produced a respectable 143 horsepower and a substantial 258 lb-ft of torque, delivering ample power for effortless acceleration and smooth cruising. The Turbocharged diesel engine was a technological advancement for its time, offering both fuel efficiency and impressive performance. The 350 SD Turbo came equipped with a four-speed automatic transmission, sending power to the rear wheels. Its suspension, featuring independent front and rear setups, provided a comfortable yet controlled ride, making it suitable for both city driving and long-distance journeys. The 350 SD Turbo's interior was a testament to Mercedes-Benz's commitment to luxury and craftsmanship. It featured high-quality materials, including supple leather upholstery, wood trim, and plush carpets. The spacious cabin offered generous seating for five occupants, with ample headroom and legroom. Advanced features included air conditioning, power windows and locks, and a premium sound system. The 1991 350 SD Turbo also benefited from a comprehensive suite of safety features, including front disc brakes, rear drum brakes, and a robust chassis designed for maximum impact protection. Its combination of power, comfort, and safety made it a highly sought-after vehicle for discerning drivers seeking a blend of luxury and practicality. Although discontinued in 1991, the 350 SD Turbo remains a symbol of German automotive excellence and continues to hold a special place among car enthusiasts today.