The BMW 335i Drive Belt is responsible for the vital engine components such as the alternator, water pump, steering pump, and air conditioner. It connects these vital components to the crankshaft with a single loop of reinforced rubber. Early 335i models, as with many cars of the past, were dependent on multiple fiber reinforced V-belts, each of which covered only one or two components and required frequent tension checks. As the auxiliary loads increased, BMW changed the design from multiple serpentine style Drive Belts to one serpentine style Drive Belt, a flat multi rib design featuring a woven path around the pulleys, automatic spring tensioner, and idlers, which saved space and reduced maintenance as the tension on the Drive Belt remained correct without manual adjustment. Modern BMW belts are made of durable EPDM rubber which gradually wears the peaks of the ribs into a U-shape rather than cracking, so that owners measure rib depth rather than looking for splits. This Drive Belt typically lasts close to 100,000 miles under normal conditions. When there are misaligned pulleys or weak tensioners coming into play, squeals or chirps are a warning sign your Drive Belt could start to slip and get too hot. Replacing a worn-out Drive Belt on a 335i will help protect components and keep the engine cool while keeping your BMW running smoothly.
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