Slipping Rubber Prop bushes

Can anyone help or offer some insight...I have a Volvo d4-260 in a 270FV.  Has anyone experienced or know what happens when the rubber bushes in the prop start to slip? According to my engineer I have slippery bushes!!  (At 3000 revs am usually at 28knots but now I barely reach 8knots.  Engine sounds fine, turbo kicks in but there is no surge or grunt of power....appreciate any thoughts or insight!!


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