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Idler-wheel tensioner

Idler-wheel tensioner Locknut Screw adjuster

Some cars are fitted with a idler-wheel tensioner, which gives simple and accurate adjustment of the belt tension. Slacken the locknut on the adjuster screw and turn the adjuster until the belt tension is correct. Retighten the locknut and re-check the tension.

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