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NOISE DIAGNOSIS Noises generated by the accessory drive belt are most noticeable at idle. Before replacing a belt to resolve a noise condition, inspect all of the accessory ACCESSORY DRIVE BELT DIAGNOSIS CHART CONDITION POSSIBLE CAUSES CORRECTION RIB CHUNKING (One or more ribs 1. Foreign objects imbedded in 1. Remove foreign objects from 2. Installation damage 2. Replace belt RIB OR BELT WEAR 1. Pulley misaligned 1. Align pulley(s) 2. Abrasive environment 2. Clean pulley(s). Replace belt if 3. Rusted pulley(s) 3. Clean rust from pulley(s) 4. Sharp or jagged pulley groove 4. Replace pulley. Inspect belt. 5. Belt rubber deteriorated 5. Replace belt BELT SLIPS 1. Belt slipping because of insuffi- 1. Inspect/Replace tensioner if nec- 2. Belt or pulley exposed to sub- 2. Replace belt and clean pulleys 3. Driven component bearing fail- 3. Replace faulty component or 4. Belt glazed or hardened from 4. Replace belt. Fig. 2 Belt Wear Patterns 1 - NORMAL CRACKS BELT OK 7 - 6 ACCESSORY DRIVE VA |