CHECK all accessories for free rotation and REPLACE accessory if necessary. REPLACE drive belt.
Loose drive belt.
CHECK condition and tension of drive belt. REPLACE drive belt or ADJUST tension of manually tensioned drive belt as necessary.
CHECK that automatic drive belt tensioner is within the indicator marks. CHECK for correct drive belt length if drive belt tensioner is out of operating range.
Rattle
Loose pulley or accessory.
CHECK for looseness and tighten.
Noisy Tensioner Pulley Bearing
Worn bearing.
REPLACE pulley per automatic belt tensioner pulley replacement procedure.
Belt Chirp
Misaligned power steering pump pulley.
ALIGN power steering pump pulley according to power steering pump pulley alignment procedure.
Severe Belt Flutter
Loose drive belt.
CHECK belt tension and ADJUST (manually tensioned belts only) if necessary. CHECK condition of drive belt and REPLACE if necessary.
Binding tensioner arm.
REMOVE drive belt from drive belt tensioner and VERIFY that tensioner arm is not frozen in position or that arm does not bind when manually moved throughout its operating range.
Frayed Drive Belt
Drive belt not seated correctly (poly-V belt).
REPLACE drive belt and VERIFY correct belt seating.
Severely misaligned pulley.
USE a straightedge to CHECK for severe angular misalignment between adjacent pulleys. CORRECT as necessary.
Tensioner pulley.
REPLACE tensioner.
Drive belt too tight.
REPLACE drive belt.
Drive belt worn out.
REPLACE drive belt.
Severely Glazed Drive Belt
Seized accessory.
CHECK all accessories for free rotation and REPLACE if necessary. REPLACE drive belt.
Loose drive belt.
REPLACE drive belt.
Improper Accessory Operation (Power Steering or Air Conditioning Does Not Work, Engine Overheats or Battery Does Not Charge)
Loose drive belt.
CHECK drive belt for looseness or GLAZING and REPLACE or ADJUST tension of manually tensioned belts if necessary.
Drive Belt Jumps off Pulley
Greatly misaligned pulleys.
CHECK for misalignment between adjacent pulleys.
Drive belt not seated correctly (poly-V belt).
REPLACE drive belt and VERIFY correct seating.
Pulley wobble.
VERIFY that no pulley wobbles during engine operation. Conditions causing wobble are: bent pulley, bent accessory shaft, rear face of pulley not seated flat against mating surface.
Excessive crankshaft end play.
REBUILD engine.
Excessive Wear on Drive Belt Tensioner
Extended off-road operation.
REPLACE drive belt tensioner according to automatic belt tensioner pulley replacement procedure.