Poly V Belts Features 鈼?High temperature resistance comparable to HNBR 鈼?Cold resistance better than ASCM, HNBR and CR 鈼?Good wear and pilling resistance 鈼?Precise grinding technology-make sure the belt with accurate angle,steady operation, and reduce noise effectively 鈼?The special fiber in the wedge surface can reduce the noise effectively and increase the transmission efficiency. Specification SPECIFICATION SectionWidth (mm)Thickness (mm)Rib Pitch (mm)Min. Pulley Dia. (mm)Manufacturing Range Min. (mm)Max. (mm) 3PK104.53.56453005000 4PK13.64.53.56453005000 5PK174.53.56453005000 6PK20.74.53.56453005000 7PK24.34.53.56453005000 8PK27.84.53.56453005000 9PK31.44.53.56453005000 10PK354.53.56453005000 11PK37.44.53.56453005000 12PK40.84.53.56453005000 Applications Alternator drive belts widely used in Automotive industry. Alternator serpentine belt wear analysis 鈶?RIB SEPARATION Appearance: A belt rib shears off or begins to separate from the belt base. Cause: The belt is not correctly positioned. One of the belt ribs is placed outside the pulley groove, causing a belt rib to run without a supporting or aligning pulley groove. Solution: The belt's life has been severely limited, so the drive belt should be replaced immediately. Make sure all ribs of the replacement belt fit into the pulley grooves. Run the engine and then, with the engine off and battery disconnected, inspect the belt for proper installation. 鈶?UNEVEN RIB WEAR Appearance: Wear that is more severe on one rib than on the others or one rib that exhibits a different wear pattern than the others. A thumping or grinding noise may also be heard. Cause: A foreign object 鈥?such as a pebble 鈥?in the pulley will cause uneven wear and can cut into the belt and break the tensile cords. Cars where the engine protection shield is missing are likely to have this problem. Solution: Replace the belt and make sure the new belt runs on perfect pulleys. Install an engine protection shield.Poly V Belts website:http://www.pioneerdrivebelt.com/poly-v-belts/