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Illustration #432

Remove the front half of the pulley and take out one shim to tighten the belt or add one to slacken it.

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