This is the engine compartment of bus 406 looking in from the front with the radiator removed; the water pump is in the top right corner. In the middle of the picture is the drive shaft to the alternator and below that is where the bottom radiator hose would connect to the engine. To the right of these is the bracket on which sits the adjustable pulley unit for the alternator drive. Driven by fan belts, the adjuster takes up any slack.
Made from cast steel, the pulley recently developed a crack meaning belt adjustment could be lost. We hold many spares and a new unit was soon fitted. The old pulley is seen below.
A close-up of the cracked casting.