Woe's since installing S/S prop
OK guys I know this isint on a RIB, but you might be able to help!
I have a Mercruiser 1.7 (120HP) Turbo-Diesel on my sports cuddy with an Alpha 1 Gen II leg
It came as standard with a 14 x 23 prop, but was over-revving, so I upgraded to a 14.25 x 24 stainless steel prop. I fitted it up nice and tight. Nothing is loose, there is no play on the spline. The prop rotates freely and doesnt come in contact with any part of the leg
When I put the engine into gear, there is a very loud 'thumping' noise until I hit 1200RPM. Once I hit this RPM it stops. This did not happen with the aluminium prop. I am worried that I might be doing damage to my gearbox. Has anyone had anything similar happen to them? The noise is definately coming from the leg, because the noise goes when I put the engine into neutral. Could it be the extra load thats making the noise?