I have a problem with my recently purchased 1976 Cobalt 19' Bowrider. It is equipped with an OMC 235 sterndrive. Initial checks were all good, so we put to the water. After thoroughly warming her up and checking for leaks, we got underway. I accelerated very slowly, up to 3,500 RPMs. After cruising for about 10 mins I attempted to get to 4,000 RPMs. Something slipped when I hit 3,900 RPMs allowing the motor to over-rev. I quickly corrected this, bringing her to an idle. The situation repeated itself two more times, all at about the same RPM. Reading a few of the posts here on iboats, I am thinking that I may have a prop with a slipped hub. Is there any other possible causes for this slip at higher RPMs? There was no noticeable noise associated with the slip. Seperate, yet may be impacting this. My tilt/trim is non-operational. The gauge indicates fully up. I plan to start running through the system to determine that cause of that failure. My thought is that the tilt in the up position may be causing for additional torque working against the prop or something.
Zack
Sumter, SC
Zack
Sumter, SC
) Most likely you have a spun hub. It could be possible that with the trim being up too high the prop is cavitating (sucking in air). If there is no noticeable change in the sound from the drive when it revs up then probably not. Try a different prop and you'll know real quick if that was it. What kind of trim do you have? Is the a jack screw at the front of the motor or hydraulic rams at the motor mounts? Might be able to help you out with that too if you can't figure it out. Good luck and welcome aboard!