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Sounds like.a failing belt tensioner to me mate.
I've had 2 fail on me when I had my zd30 crd.
The bearing hers dirt and grit inside and basically wears itself down to bare metal making a racket.
Eventually siezes up.
Sent from Note 5 using TapaPro
Thanks for the help Hodge, think I'll chase up a tensioner.
Do you need to take out the radiator to get to the belt, tensioner and all the other bits & pieces?