Teeth FRONT
FACES are worn with fibrous appearance. Teeth
BACK FACES are maiden.
CAUSES:
Extreme low tension.
GENERAL:
Drive side of belt teeth are worn/undercut with fibrous white
appearance. Back (non-drive) side of teeth are literally as new with no wear. Again a common failure due to extreme
low tension. Belt rides out of pulley teeth and thus total belt load is concentrated on this reduced tooth contact.
Compounded by the teeth outward movement wear is very visual and obvious.
ACTION:
Tension as per OEM specification on a cold engine
and repeat procedure during belt "settle-in" period.
LAND WEAR
FEATURES:
Polished or fibrous tooth roots/lands.
CAUSES:
High tension.
GENERAL:
Over-tensioning causes pulley teeth to bottom out and over-contact
the tooth roots. Initially load polishing occurs which then develops to the elastic nylon fabric becoming frayed
and fibrous in appearance. Belt will fail with possible other over-tension symptoms.
ACTION:
Ensure tension is as per OEM specification on a cold engine
and repeat procedure during belt "settle-in" period.
