Symptom Chart

Condition	Possible Sources	Action
Accessory drive belt cracking (over 15 cracks in a rib over a distance of 100 mm [4.0 in])	Accessory drive belt	INSPECT the accessory drive belt. Refer to Inspection and Verification . INSTALL a new accessory drive belt as necessary.
Accessory drive belt chunking	Accessory drive belt	INSPECT the accessory drive belt. Refer to Inspection and Verification . INSTALL a new accessory drive belt as necessary.
Damaged pulley grooves		INSPECT the accessory drive belt pulley grooves for damage. INSTALL a new pulley or component as necessary.
Accessory drive belt noise, squeal, chirping or flutter	Defective/worn or incorrect accessory drive belt Misaligned pulley(s) Pulley runout Damaged or worn accessory drive component or idler Fluid contamination of accessory drive belt or pulleys	Refer to Drive Belt -- Noise/Flutter . REPAIR or INSTALL new parts as necessary.
Damaged or worn accessory drive belt tensioner		Refer to Belt Tensioner -- Mechanical and Belt Tensioner -- Dynamics . INSTALL a new accessory drive belt tensioner as necessary.
Damaged pulley grooves		INSPECT the accessory drive belt pulley grooves for damage. INSTALL a new pulley or component as necessary.
Accessory drive component failure		CHECK the accessory drive components. INSTALL new components as necessary.
Accessory drive belt idler pulley bearing failure		INSPECT the accessory drive belt idler pulley for freedom of rotation and damage. INSTALL a new accessory drive belt idler pulley as necessary.
Premature accessory drive belt wear	Defective or incorrect accessory drive belt Misaligned pulley(s) Pulley runout Damaged accessories Incorrectly installed drive belt Fluid contamination	Refer to Drive Belt -- Noise/Flutter and Drive Belt -- Incorrect Installation . REPAIR or INSTALL new parts as necessary.
Damaged pulley grooves		INSPECT the accessory drive belt pulley grooves for damage. INSTALL a new pulley or component as necessary.