Generator (Gen) (2005-2006): Design: Freewheel
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.
Some alternators are fitted with freewheels between the rotor shaft and the pulley. However, it is possible to see that the pulley is fitted with freewheels from the cover fitted over the pulley's nut in the centre. The freewheels allow the alternator's rotor shaft to rotate freely in one direction. This keeps any jerking in the belt transmission to a minimum. For engine B8444S, the alternator is not fitted with freewheels.