Hi Mark A couple of other conjectural rocking to and thro noise possibilities to ponder especially since you have not really found anything visibly wrong internally:
1 Piston slap at bottom of bore. Always present though 2 Loose prop flange/hub 3 if not hand started, loose ring gear or snagged pinion gear not releasing. 4 Foreign object snagging in alternator unlikely though 5 Valve seized in open position knocking on piston As you pull the prop through 360 degrees in one direction was the noise predictably repetitive viz, common to all cylinders?... or was it apparent only as you rocked back and forth loading and unloading. Cheers John John Martindale Unit 39 40 Solitary Islands Way Sapphire Beach NSW 2450 AUSTRALIA
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