|
|
ACCESSORY DRIVE BELT DIAGNOSIS VISUAL DIAGNOSIS When diagnosing serpentine accessory drive belts, small cracks that run across the ribbed surface of the Refer to the Accessory Drive Belt Diagnosis charts for further belt diagnosis. NOISE DIAGNOSIS Noises generated by the accessory drive belt are most noticeable at idle. Before replacing a belt to ACCESSORY DRIVE BELT DIAGNOSIS CHART CONDITION POSSIBLE CAUSES CORRECTION RIB CHUNKING (One or 1. Foreign objects imbedded in pulley 1. Remove foreign objects from pulley 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 tips 4. Replace pulley. Inspect belt. 5. Belt rubber deteriorated 5. Replace belt BELT SLIPS 1. Belt slipping because of insufficient 1. Inspect/Replace tensioner if 2. Belt or pulley exposed to substance 2. Replace belt and clean pulleys 3. Driven component bearing failure 3. Replace faulty component or bearing 4. Belt glazed or hardened from heat 4. Replace belt. Fig. 23 Belt Wear Patterns 1 – NORMAL CRACKS BELT OK DN COOLING SYSTEM 7 - 19 DIAGNOSIS AND TESTING (Continued) |