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A customer’s 2008 Dacia Logan MCV 1,5 dCi was brought in with excessive auxiliary drive belt noise and alternator warning lamp on. We replaced the auxiliary drive belt, but this only temporarily fix the fault. Have you any ideas?

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There is a problem known to us that fits the symptoms you describe and it affects models with K4M, K7J, K7M and K9K engine codes. The alternator pulley suffers from premature wear and possible failure which causes the auxiliary drive belt to slip leading to the alternator warning lamp illuminating. Check the alternator and alternator pulley for damage Fig1.A. Replace parts as necessary. This should rectify the fault.

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