G23 Prop Fell Off .....

[SoCal G-Man]

Here are the pics from when mine broke

Sorry to hear another G23 member joining our prop shaft club. Check inside your hull. When mine broke, it looked minor from underneath the boat like yours, but it had punched a hole through.

[cptotr]

I should probably look that hull over a little closer when I get back to the boat. Let me know what you find out on the props and if it does or doesn't have a longer hub and even if it matters. It doesn't seem like it could make a difference, but I'd definitely be interested if it did. I wonder if the dealer would put something else other than what came on it stock for the warranty repair??


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[scarbs]

Thank you. The ACME sales rep explained to me that a longer hub would reduce the chance of a shaft breaking. I just looked on their website, and the 3345 and 3081 seem to be identical. Perhaps ACME has their specs wrong online and their sales rep has it backwards? I just left a message for Brian at Valley Prop Service in Ventura, CA. He has been a prop guru for decades. Hopefully he can shed some light on this, and I can share his opinion.

I just went through this with Nautique and ACME. I had the 3081 on my boat when the main seal on the transmission failed and leaked all of the fluid out. We had no idea until it was too late and the transmission completely failed leaving us stranded for hours at Lake Powell. Everything was covered under warranty, but as part of the repair, Nautique agreed to preemptively change the prop shaft and prop. As part of that repair, the dealer claimed that the larger hub of the 3081 was rubbing on the strut and "may" have contributed to the transmission seal failure and refused to reinstall the 3081 on the boat--even though it had installed the 3081 on the boat in the first place. I talked to ACME about it and it refused to believe the dealer's theory, but fortunately, ACME agreed to swap out the 3081 for a 3345. I currently have both the 3081 and 3345 props in my possession as well as two stock props and can confirm that the 3081 has a bigger hub and that the 3345 has a hub identical to the stock hub. But I have no idea which one is better for the breaking shafts. Seems like the stock props are breaking the shafts at a higher rate than any other prop.

[SoCal G-Man]

I should probably look that hull over a little closer when I get back to the boat. Let me know what you find out on the props and if it does or doesn't have a longer hub and even if it matters. It doesn't seem like it could make a difference, but I'd definitely be interested if it did. I wonder if the dealer would put something else other than what came on it stock for the warranty repair??


Sent from my iPhone using PLT Nautique

I am sure there are several theories about rotating mass behind the strut. It seems like spreading-out the prop weight would be less stress on the driveline, unless the additional weight of the 3/8" longer hub causes more driveline stress? I should have paid more attention in math...

[SoCal G-Man]

I just went through this with Nautique and ACME. I had the 3081 on my boat when the main seal on the transmission failed and leaked all of the fluid out. We had no idea until it was too late and the transmission completely failed leaving us stranded for hours at Lake Powell. Everything was covered under warranty, but as part of the repair, Nautique agreed to preemptively change the prop shaft and prop. As part of that repair, the dealer claimed that the larger hub of the 3081 was rubbing on the strut and "may" have contributed to the transmission seal failure and refused to reinstall the 3081 on the boat--even though it had installed the 3081 on the boat in the first place. I talked to ACME about it and it refused to believe the dealer's theory, but fortunately, ACME agreed to swap out the 3081 for a 3345. I currently have both the 3081 and 3345 props in my possession as well as two stock props and can confirm that the 3081 has a bigger hub and that the 3345 has a hub identical to the stock hub. But I have no idea which one is better for the breaking shafts. Seems like the stock props are breaking the shafts at a higher rate than any other prop.

I don't see how the additional 3/8" can come close to rubbing??? At least on my 2016.

[scarbs]

I don't see how the additional 3/8" can come close to rubbing??? At least on my 2016.

I was skeptical, and thoroughly questioned the dealership about it. It ultimately admitted that the prop sat approximately 1/8"-3/16" away from the strut. And further admitted that it was their theory that because it was that close to the strut, the pressure created in that small space "may" have caused problems. Neither I nor ACME believed this theory, but the dealer would not put the 3081 prop back on. I have no idea who is right or wrong--just that I now have the 3345 on the boat instead of the 3081. Interestingly, the two are supposed to have the same specs, but RPM on the 3345 at surfing speed are about 150-200 higher than the 3081 (still about 300-350 lower than the stock prop).

[SoCal G-Man]

I was skeptical, and thoroughly questioned the dealership about it. It ultimately admitted that the prop sat approximately 1/8"-3/16" away from the strut. And further admitted that it was their theory that because it was that close to the strut, the pressure created in that small space "may" have caused problems. Neither I nor ACME believed this theory, but the dealer would not put the 3081 prop back on. I have no idea who is right or wrong--just that I now have the 3345 on the boat instead of the 3081. Interestingly, the two are supposed to have the same specs, but RPM on the 3345 at surfing speed are about 150-200 higher than the 3081 (still about 300-350 lower than the stock prop).

Wow, that is interesting. Thanks for sharing.

[<ReLax>]

I have a new 2019 G25 and just stumbled across this thread. Are these prop issues happening with the G25s too or limited to the G23s?

[NautiqueJeff]

I actually can't remember ever hearing of a G25 with a broken shaft. There have been multiple other G-series (G23 and G21) boats with this failure, but I don't remember ever hearing of anyone with a G25 with this issue. I could be wrong though.

[GMLIII]

I have a new 2019 G25 and just stumbled across this thread. Are these prop issues happening with the G25s too or limited to the G23s?

You probably almost fainted when you found this thread . I think about my prop shaft breaking ever time I go out in my G23

[RDT-G23]

You probably almost fainted when you found this thread . I think about my prop shaft breaking ever time I go out in my G23

As do I... This shouldn't be the case.

[charlesml3]

I actually can't remember ever hearing of a G25 with a broken shaft. There have been multiple other G-series (G23 and G21) boats with this failure, but I don't remember ever hearing of anyone with a G25 with this issue. I could be wrong though.

I've never heard of a 200, 210, 230 or any GS boat with this issue either. Weird how it seems to be completely limited to the G21 and G23.

-Charles

[Kenv]

On this thread....Post number 59......G25. I think that's the only one I remember...and it's only been about 6 G21s....maybe a few more.

[GMLIII]

On this thread....Post number 59......G25. I think that's the only one I remember...and it's only been about 6 G21s....maybe a few more.

It would be interesting to know by a company insider on the total breakage count by model and year

[Kenv]

For sure GMLIII. That would be a Golden ticket right there. If I had to guess....I'd say 40 G23's....10 G21's....and 5 G25's of various model years...from 2013 to 2018. Also curious about any boats outside the U.S.....and if any were Coastal Edition with the James Bond submarine attack spinner feature.