its only there when engine cold could be pulley but when im worried about rod bearings would i hear rod bearing through listening tool through the alternator or would it just be alternator it self or alternator pulley my local garage is useless and just say worst case i can hear the rattle clearly through the alternator with the listen tool i noticed it with screw driver first then bought proper tool. its not heat shield took it off but i need to find out cause i want to start to mod lol