Geoff, Is it possible that what you are feeling is the crankshaft
rotating , both ways, until the slop in the timing chain is taken up?
Yes the pulley is keyed to the shaft and they do , occasionally, work
loose. When they do wear loose, they make a rattly noise when running.
You can pull the whole asby. and have new keyways broached or you can
do as I have done on several engines and JB them back together. I have
successfully done a 283, 240Z and my own faithfull 49 CJ which is
still going strong these last 10 years or so.
Good Luck, Brad
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