Failing or slipping belts can cause all kinds of headaches. Sqeaking or
squealing from the engine bay is one sign of bad belts. Inspect belt
condition to make sure you have no cracks (in the inside edge) or excessive
glazing (on the pulley contact areas). Fine black powder all over the
front of the engine can be a sign that the belts are degrading to a loose
belt, misalign pulley or failing pulley (bearing).
As a rule of thumb, tightness should be about ¼" deflection at the
WIDEST span for V-belts. Overtightening can cause (pulley) bearing
failures and accelerated belt wear.
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