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I'd add 'timing pulley recession' to the list of possible causes for loosening.


Toby -

Interesting observation. I don't remember from my tear-down if the crank nose was a taper or a straight cut leaving a shoulder for the timing sprocket to butt against. Are you saying it chewed into a shoulder on the crank or spread up and over a taper?

Either way though the recession result could be from the timing sproket spinning on the crank after the key broke, couldn't it?

Frank

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