HopinImFloatin
Petty Officer 2nd Class
- Joined
- Sep 21, 2010
- Messages
- 136
hello, i finally got my deck and partial stringer replacement done for the last part of this season and got the boat out on the water (87 cobia bowrider 4.3 cobra dog clutch drive). I now seem to have a vibration from maybe 1500-2500 rpm that i didnt notice last season. Smooths out nicely at 3000 rpm and over with the boat trimmed. Feels like a bad u-joint in a car (high frequency type) but doesnt really seem to change with steering or trim, maybe a LITTLE but that could be from different loads on the hull i was thinking. Its not a noise but a feeling. I had the leg off over the winter and had it resealed, and before i put it back on i checked the alignment and seemed to me to be good. The u-joints seemed fine, not loose OR stiff and the gimble bearing was smooth. My prop isnt in the best of shape but the guy that did the drive reseal said it wasnt that bad. It definetly has dings and one nice warp? ,lack of a better term on one of the blades which concerns me. Is it possible that it could be the prop and i didnt notice it last yeay because the boat wasnt as solid? I am also noticing a shimmy in the steering at low rpm like a bad belt in a car tire feels in the steering wheel. that also goes away at higher rpm but if i remember right, that did that last year. I want to replace the prop anyway and go to a 4 blade, now has a 14 1/2 X 19 3 blade. Just wondering if i might be on the right track. thanks
