Jeff,
It's easy to tell whether it's the timing chain or the water pump,
assuming these are the only 2 possibilities. Remove the fan belt and
start the car.
If it's silent, you've got exactly 3 possible culprits, crankshaft
pulley, water pump, or dynamo (yours has a dynamo, not an alternator,
doesn't it?). All three pulleys can be wiggled by hand, but shut the
motor off before you grab the crankshaft pulley. See if one of them
wobbles.
>From long experience my money's on the dynamo.
Bill Kelly
'62 Herald, finally with quiet dynamo
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