1991 Mercedes-Benz 350SDL Service and Repair Manual

This factory service and repair manual for the 1991 Mercedes-Benz 350SDL covers a model listed in a single specification. Its diesel engine displaces 3.4 liters across six inline cylinders, uses one overhead camshaft and is turbocharged. The car is a four-door sedan, listed only in Base trim. The torque values, specifications and wiring diagrams here cover that turbodiesel sedan.

Engines covered

• 3.4L inline-six — SOHC, turbocharged, diesel

Body styles covered

• 4-door sedan

Trims covered

• Base

Known issues on the 1991 350SDL. Two owner complaints name this exact car, and between them they touch the diesel fuel system and the engine and its cooling. Separately, three complaints were filed against the wider 1991 W126-chassis models, one each for the air bags, the hydraulic service brakes and engine cooling. For the 3.4L turbodiesel, the manual supplies fuel system and cooling system procedures, specifications and torque values, plus diagnostics and wiring diagrams that reach the sedan's air bag and brake circuits.