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Illustration #433

Replace the pulley front half with the shim on the outside of the pulley, between it and the nut or nuts.

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