Attached to the nose of the crankshaft, the crankshaft belt pulley — often incorporating a torsional vibration damper in a single assembly — drives the auxiliary belt that runs the alternator, air-conditioning compressor, and power-steering pump. The outer ring of a pulley-damper combination is connected to the hub through a bonded rubber ring that absorbs the torsional pulses generated by cylinder firing events. When that rubber decouples or cracks — a failure that worsens gradually with heat cycles — the outer ring can slip relative to the hub, altering the timing of the auxiliary drive and, on engines where the crankshaft position sensor reads from the pulley teeth, introducing misfires and fault codes that appear unrelated to the drive belt. Febi Bilstein and Ruville supply replacement crankshaft pulleys engineered to the OE damper specification, including the correct rubber compound hardness and outer-ring mass that are tuned to each engine's vibration signature. Fitting a pulley from a different engine family — even one that appears dimensionally similar — risks leaving the auxiliary drive running at a frequency the torsional damper was not designed to suppress. Replacement is typically prompted by auxiliary belt squeal, a wobbling belt run at idle, or a crankshaft position sensor fault with no other obvious electrical cause.
OE numbers 1 to 100 of 3,044
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Crankshaft pulleys are specific to engine code rather than just model year, because different engine variants carry different torsional damper tunings and differing numbers of auxiliary belt grooves. The OE reference on this page is matched to your exact engine code via TecDoc fitment data. Enter your vehicle details — including engine code if known — before ordering, as two cars with identical bodywork can leave the factory with different engine variants requiring physically incompatible pulleys.
A plain pulley is a solid casting that transmits drive directly from the crankshaft. A pulley-damper assembly has an outer ring connected to the inner hub through a rubber element specifically engineered to absorb torsional vibration generated by engine firing events. Modern four-cylinder diesel and petrol engines almost universally use the combined design. Replacing a failed damper with a plain pulley removes vibration absorption from the auxiliary drive train, risking premature alternator bearing and belt wear, and can introduce resonance-related faults in sensors that read crankshaft speed.
Yes. On many engines the reluctor ring used by the crankshaft position sensor is machined into the outer face of the pulley hub. When a pulley-damper's rubber element fails and the outer ring slips, the sensor picks up irregular tooth spacing and generates a crankshaft position signal fault. This can manifest as intermittent misfires, erratic idle, or an engine management warning light, and can be misdiagnosed as a sensor, injector, or ignition fault if the pulley itself is not visually inspected first.
The most common early warning is auxiliary belt squeal or visible belt oscillation at idle — caused by the outer ring of the damper moving slightly out of plane as the rubber degrades. A cracked or glazed rubber ring visible on the pulley face is definitive evidence of failure. On cars where the crankshaft sensor reads from the pulley, unexplained misfires or a crank position fault code with no wiring fault should prompt a pulley inspection. Complete outer-ring separation is rare but causes immediate auxiliary drive failure and potential belt ingestion into the engine bay.
