Beneteau swift trawler 44 starboard hand engine movement

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cswann

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Joined
Oct 17, 2024
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2
Location
United Kingdom
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.
 
Could be one or two bad cylinders or injectors or any externally mounted engine driven device.

My Ford Lehman has an external hydraulic pump screwed direct on the stringer and when the two v-belts are tightened too much, the engine starts wobbling at certain RPM.
 
It is difficult to see with the eye that the vibration dampers are still good.
What's between the gearbox and the propeller shaft?
 
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