Beneteau Swift Trawler 44 engine movement

[cswann]

Just wondering if anyone can help. I purchased a 2016 Beneteau swift trawler 44 six years ago. The starboard hand engine has always moved about more than the port engine at 1,200rpm . This year I had to change the black jacks(shaft seals) so thought I would check the prop, shaft and coupling at the same time. The prop was very slightly out so the engineers adjusted it. The shaft was perfectly straight and coupling was running true, put it all back together and the movement in the engine is still as bad. Thought it may be the engine mounts but they all look like new. Anything over 1,200 the centrifugal force takes over and the engine settles down.

 

[Mac2]

I had something similar with my previous boat. My engine mounts looked fine. When I stepped on my exhaust manifold to get across the engine bay, the vibration stopped. The engine mount had separated at the black/rubber shock absorber. It was in the middle and I had to jack up that side of the engine to see the separation. You might spray the rubber with wd40 to clean it, so you can inspect for a crack.