Rotating electrics remanufacturer, Autoelectro, has produced some practical advice for technicians to check for a specific issue with a BMW model after identifying a problem that can cause premature alternator failure.

The issue exists on the BMW 3.0 petrol E90/92/93 335i (2008-onwards), caused by the power-assisted steering (PAS) pump pulley or auxiliary belt coming into contact with the sub frame when the vehicle is driven over speed humps. The contact between the components can cause the auxiliary drive belt to stretch, break or snap, resulting in the premature failure of the alternator pulley and bearings, along with the failure of the PAS pump pulley.

Autoelectro recommends that technicians inspect and, if required, replace any damaged components before replacing the alternator (Autoelectro part number AEK3107). The part that need inspecting are; the Auxiliary drive belt, PAS pump pulley, Sub frame, and LH engine mount.

Failure to rectify the fault will result in the premature breakdown of the alternator after replacement.

Autoelectro continues to grow its technical bulletin library at a fast pace, providing technicians with the latest and up-to-date information to ensure they are fully-equipped and prepared to tackle many issue that enters their workshop. Several hundred technical bulletins are available to access, free-of-charge, from its website to subscribers at www.autoelectro.co.uk.