Your photos, don’t show mounts that are dried out looking or cracked – a sign of hardening – so yours may be fine. However they do all harden over time, and are easy and cheap
(£5.00) to obtain from any machinery supplier. Mounts are generic in nature for standard applications such as this. Pull one out and get on line or to your local machinery trade
shop for replacements
. Since you are in the UK: Male-Male Anti-Vibration Bobbins with M10 thread
But before you do that, since your observation of moving the unit away from the bulkhead drops noise and in photo
1754, the mount looks OK, I suggest first see if just more isolation from the boat works:
From your photos is appears to be a 10mm hex bolt top holding the generator base pad to the generator enclosure base, and then the allen key hex head
and washer looks like they are holding the enclosure to the vessel floor board. I suggest that loosening the allen key hex headed bolt and confirm they are holding the generator enclosure to the vessel floor. If you confirm this to be the correct observation, undo all, raise the unit up as a temporary measure, put two pool noddles (or similar) underneath and run the unit, ensuring it is away from the bulkhead too. If that immediately reduces the noise – then you are on the right track and you can follow others suggestions re additional vibration isolators or mats.
To your question on “how do I remove the board the generator is sitting on?” the potential answer is you don’t. You separate the floor of the generator enclosure from the vessel support board with vibration dampers, either with additional mounts or mat.
Since the allen key hex head
bolts (if confirmed as above) are already into threading into the large floor board, then all you have to so is install additional machinery vibration mounts between the two using the same mounting locations and existing thread size: Anti-Vibration Machine Mountings with 2 holes
An alternative is to install a vibration mat under the enclosure area, and over drill clearance holes say 4mm through the enclosure base plate, (so no physical / vibration noise path) install rubber washer under the large washer and tighten the hex head down again.
Also check you exhaust area – make sure there is no metal to bulkhead contact. Note: All the above are suggestions based on your writings and photos, and any final solution is your call. Have a try and let us all know how you get on and the final solution.