BMW S58, Owner'S Handbook Manual

Page: 42 / 102

S58�Engine
6.�Belt�Drive�&�Ancillary�Components
36
The�belt�pulley�for�driving�the�coolant�pump�has�been�made�as�large�in�diameter�as�possible�in
order�to�reduce�the�speed�of�the�pump�and,�thereby,�the�coolant�delivery�rate�at�high�engine�speeds
(cavitation).
The�diameter�of�the�belt�pulley�for�driving�the�alternator�has�been�changed�in�comparison�with�the�one
on�the�B58TU�engine.�That�was�necessary�because,�as�a�result�of�the�higher�revving�speeds�of�the
S58�engine�compared�with�the�B58TU�engine,�the�alternator�would�otherwise�have�been�driven�too
fast.