Description & Operation

NOTE: This article applies to 911 Carrera, Carrera 4, GT3 and Turbo vehicles with a factory designation of 996.

Generator is a three-phase generator driven by engine accessory drive belt. Generator bracket holds generator, A/C compressor and is also an integral part of the engine cooling system. Bracket is a hollow cast unit with a seal joining two separate halves through which coolant flows when engine is running.

On vehicles equipped with a manual transmission, alternators are equipped with a freewheeling belt pulley. Freewheeling pulley eliminates belt derailing under certain conditions (allowing for elimination of the drive belt guide clip used on earlier applications), by allowing generator to free wheel when turning backwards (against normal engine rotation). Freewheeling pulley requires a 17 mm multi-toothed tool (PNA 721 048) for removal and installation purposes.