B4000 DS Cab Plus 4 2WD V6-4.0L SOHC (2002)
If the above procedures do not correct the drive belt noise, try replacing the drive belt with a known good original equipment drive belt. However, the
drive belt noise may return (with mileage) if one of the above conditions still exists uncorrected.
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With engine running, visually observe the grooves in the pulleys (not the pulley flanges) for excessive wobble. Replace components as required.
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Check all accessories, mounting brackets and belt tensioner, for any interference that would prevent the component from mounting properly.
Correct any interference condition. Recheck belt tracking.
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Tighten all accessories, mounting brackets and belt tensioner retaining hardware to specification. Recheck drive belt tracking.