6 is the Alternator which I assume likes going like the clappers, whereas 5 is the water pump which would just cavitate at very high rpm (would be my guess).
Possibly the pulley on the alternator has seized. My mate looked at the pic.
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6 is the Alternator which I assume likes going like the clappers, whereas 5 is the water pump which would just cavitate at very high rpm (would be my guess).