Vibration fwd gear problem 2 blade gori prop

[737flyboy]

Hey Sailors,
Anyone had a similar problem with a gori two blade folding prop? I back out of my slip with no problem, when I put the boat in fwd gear 50% of the time I get a tremendouse shuttering as I advance the throttle. I go back and forth from neutral to foward till I can finally advance the throttle with no shuttering. What a pain! Anybody? Anybody? Prop was new 2 seasons ago. I replaced the cutlas bearing last spring, no help.

John

[Jon D]

No experience with Gori but that sounds a lot like the problem I used to have with an old Martec non-geared folder years ago.

If you don't give it a 'fair bit' of throttle when first going into gear both blades would not open. The unbalanced prop would then make more noise and vibration than I could imagine.

I thought though the Gori is a geared folder so that should not be able to happen.

[BC Mike]

What Jon D said. If it is non geared one blade may open by itself when going forward. Stuff it in reverse first and then back to forward. I removed my non geared prop as I figured it could be dangerous if someone else had to drive the boat. If it is a geared prop then you may have a problem with the gears and only one blade is opening. Not sure how that could happen. You might have to look at it. You might be able to reach the prop from a dinghy and only your arms will get wet.
Michael

[Alan Wheeler]

You may also want to check you have not got marine growth or some foriegn material caught in the gearing or any movable part, that may stop or hinder one blade from opening properly.

[captjohn360]

hey john wheres your boat now ? i have two goris on my boat. also i am in chi/wicker park.give me a call and maybe together we can figure it out....jt....312 4321990

[737flyboy]

Thanks for all your input. My Gori two blade prop is a geared prop. I talked to the service guy at Mac Boring, they service Yanmar engines. He said he has seen problems with geared folding props if there is no space between the blades when the prop is closed or if there is not an off-set between the blades when it's closed. He said that in some cases suction is created between the blades. I am going to the boat yard tomorrow to check it out.