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I-injini idler pulley yivili ejikelezayo efumaneka kwikhompatimenti ye-injini yesithuthi, ikakhulu inxalenye yenkqubo yebhanti yokuqhuba. Isebenza umsebenzi obalulekileyo wokukhokela ibhanti enika amandla izinto ezahlukeneyo ze-injini, kubandakanya i-alternator, impompo yokuqhuba amandla, kunye ne-compressor yomoya. Ngokugcina uxinzelelo oluchanekileyo lwebhanti, i-idler pulley iqinisekisa ukuba ezi com.