Most hunter boats with 1GM10s and Volvo PSS have this 'issue' to some extent. In cold weather and / or when the engine is cold there might be the faintest hit as gears are engauged and the prop starts turning. It is most evident in warm weather / when the engine has been running for 20 mins or so as the stern gland / engine mounts soften.
New engine mounts, cutless bearings, flex couplings and hours of engine alignment do not overcome the issue. A brand new stern gland does appear to offer better support for a while. I was told not to worry about it as it is almost inevitable with the above setup and does no harm (except to your pride when approaching a mooring within earshot of others)
At tickover try applying a little pressure to the prop shaft with your hand .... close to the stern tube: Up, down, left, right. If it's engine alignment it may well stop when you push in one of the directions.
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Re: 2 Bladed Folding Props & PSS Dripless Shaft Seal
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