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Autoelectro warns on PAS pump pulley failure

A fault on a BMW model, triggered by its power-assisted steering (PAS) pump pulley or auxiliary belt coming into contact with the sub frame when being driven over speed humps, is causing premature failures, Autoelectro has warned technicians.

The contact between the components, on the BMW 3.0 petrol E90,92 and 93 Series 335i (2008-onwards), can cause the auxiliary drive belt to stretch, break or even snap. Consequently, the damage can result in the premature failure of the alternator pulley and its bearings, as well as the PAS pump pulley.

When tasked with working on the vehicle, technicians should inspect and replace all the components mentioned, as well as the LH engine mounting, if necessary, before fitting a replacement alternator.
Failure to do so will mean the fault is likely to reoccur and the alternator will stop working. The alternator will not be covered under Autoelectro’s warranty due to misdiagnosis and incorrect fitting procedures.
This latest technical bulletin is one of more than 500 available to subscribers of Autoelectro’s website. Not only can users access the library to solve issues that arrive in their workshop, but the latest bulletins will be delivered to straight to their inbox.

If, however, technicians still want to pick up the phone, then a member of the remanufacturer’s team of experts, based at its Bradford headquarters, will happily take their call. There is also a live chat facility online.