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Split pulley

Split pulley Shims

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.

Explained in

    Checking, adjusting and refitting drive belts

    Drive belts always stretch a little in use, because of the strains put on them by driving the water pump and generator, as well as the fan itself if it is in the system. Age and continual flexing also cause belts to crack and deteriorate. Read more