i have found the parts bulletin you mentioned in the beginning of this discussion, concerning the screw/spacer info where Volvo
changed the thickness of the coupling mounts. In the bulletin are drawings and measurements of the new and old coupling ang by that I can for sure say that the coupling is way beyond the specifications. It should be 30,5mm thick and with +- 0,5 mm tolernce. But mine measures 32 mm and 33mm around it.
But the question is, why did it fail?
I had observed the following:
- previous owner told me, that he had hit something on the original prop and this caused the prop to be exchanged - I got the repaired one as spare.
- Second prop was sligtly out of balance on one blade so I have installed a brand new one last year which is fine now.
So, I assume those provocated the issue. With unbalance in the prop, there is a rattling in the saildrive and this could cause the coupling to walk.
I just want to check for the flywheel / gear
alignment issue as well and would like to measure the screw holes as specified in the other service
bulleting you mentioned. A VP dealer had checked drive and gear
serials and there is no outstanding service
issue, but just to be save I would like to check it as the flywheel housing does not fluctuate so good on the starbord side than on the port side. I could not find that bulletin on the internet.