Split pulley Shims
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Where the alternator is on a fixed mounting the belt can usually be removed or adjusted by means of a split pulley. It has two dished discs bolted together, with a number of spacer washers - or shims - between.

This shows the outer half of the pulley with nut, washer and surplus shims.

Appears in

Checking, adjusting and refitting drive belts

How the drive belt runs The belt runs in V-pulleys and drives the generator and water pump, with...