Boats For Sale:
G boat problems? |
Post Reply 
|
Page 12> |
| Author | |
8122pbrainard 
Grand Poobah 
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
 Post Options
 Thanks(0)
 Quote Reply
 Topic: G boat problems?Posted: June-18-2018 at 12:37pm |
|
Has anyone heard about prop shaft breaking problems CC is having? I know of one up here that's on it's 5th shaft since last season. I wonder if I need to go over to the dealer and see if they know how to do an alignment!
|
|
 |
|
|
Gary S
Grand Poobah
Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 1:23pm |
|
Yea big topic on PN in the past still happens every now and then,but 2015 I think were the big years. They are breaking between the strut and prop.
|
|
|
|
|
shierh
Gold Member 
Joined: April-29-2015 Location: Florida Status: Offline Points: 605 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 1:34pm |
|
sounds like shaft size isnt correct. Bigger engines, bigger props etc. Wake board tanks with lots of load.
|
|
|
|
|
Gary S
Grand Poobah
Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 1:47pm |
|
They increased the shaft size and it still happens. Google planet nautique g23 drive shaft issues if you want to see pictures. I have a theory that it's the crappy music they play while surfing, prop says I'm outa here......
5th shaft a season up there must average every time they go out,ice chunks caught between hull and prop?
|
|
|
|
|
bb12
Senior Member 
Joined: March-24-2009 Location: Kansas, USA Status: Offline Points: 355 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 1:56pm |
|
Yep.. I’m on one of the Nautique Owners Facebook pages and it seems somebody is posting about this happening every few weeks.
Matter of fact...this was posted this morning. 
|
|
|
1989 Ski Nautique 2001
|
|
|
|
|
TRBenj
Grand Poobah
Joined: June-29-2005 Location: NWCT Status: Offline Points: 21108 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 2:04pm |
|
I believe that all G boats now have 1-1/4” shafts- the 550hp SC still has the 1.5:1 v-drive but the lower engine options have 2:1 reduction and they all need that big shaft with the amount of torque they’re putting to the prop. I think the very early production boats may have used 1-1/8” and the fix is to upsize.
|
|
|
|
|
8122pbrainard
Grand Poobah
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 2:09pm |
|
Gary,
Thanks, I was just over on PN and the 1&1/4"s are breaking too. Same spot were the key way begins weakening the shaft. Maybe they should try forgoing the keyway and just lap the prop to the shaft. 
|
|
|
|
|
Gary S
Grand Poobah
Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 2:33pm |
|
I thought it looks like 1/4 “ out from the key way start but not seeing one in person it’s just speculation. Must be something up, the people providing the shafting should know what they are doing, something they have never had happen before, hp, weight, girlie tunes...
|
|
|
|
|
8122pbrainard
Grand Poobah
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 3:40pm |
|
General Propeller makes the shafts but they make them per the customers specs.
|
|
|
|
|
shierh
Gold Member
Joined: April-29-2015 Location: Florida Status: Offline Points: 605 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 3:50pm |
|
There are different alloys that are stronger, not sure how good etc.
General makes good stuff. they made my replacement shaft. Took my old one over to them with the prop and coupler and they made new shaft and reworked my prop. |
|
|
|
|
phatsat67
Grand Poobah
Joined: March-13-2006 Location: Indiana Status: Offline Points: 6147 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 5:09pm |
|
The original issue (which ended up as a recall) was that they spec'd a 1-1/4" shaft but instead of getting Acme to design a specific propeller they just turned the shaft down to a 1-1/8" taper so all of that extra shaft strength was lost where the taper connected to the rest of the shaft.
They swapped them all out to the correct shaft and propeller and they are still having issues? That sucks. |
|
|
|
|
8122pbrainard
Grand Poobah
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 5:17pm |
|
What prop (dia. and pitch) are they putting on the 550hp?
|
|
|
|
|
Riley
Grand Poobah
Joined: January-19-2004 Location: Portland, ME Status: Offline Points: 7946 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 5:28pm |
|
They probably need to go with these. Not only will they be able to eliminate the shaft, they'll be able to get rid of the rudder and steering wheel as well.
https://www.thrustmaster.net/azimuth-thrusters/z-drives-for-the-inland-waterways/ |
|
|
|
|
KENO
Grand Poobah
Joined: June-06-2004 Location: United States Status: Offline Points: 10644 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 5:50pm |
Maybe you should take your galvanic corrosion chart over with you Pete, and you could see if they're using some inferior SS screws in the strut along with explaining the finer points of galvanic corrosion of dissimilar metals. 
|
|
|
|
|
Jonny Quest
Grand Poobah
Joined: August-20-2013 Location: Utah--via Texas Status: Offline Points: 2840 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 5:59pm |
Those Z-Drives are pretty cool. We've had a couple of vessels with those and the maneuverability is off the charts. Great for dynamic positioning, too. JQ |
|
|
Current
2003 Ski Nautique 206 Limited Previous 2001 Ski Nautique Open Bow 1994 Ski Nautique Open Bow Aqua skiing, ergo sum |
|
|
|
|
8122pbrainard
Grand Poobah
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 6:55pm |
Bruce, I sure agree the G's need it!
|
|
|
|
|
SNobsessed
Grand Poobah
Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 7:33pm |
|
It would be interesting to know if the metallurgical failure is torsion only or is there some cyclic bending stresses from the prop overhang. Possibly a collar between strut & prop would reinforce it.
|
|
|
“Beer is proof that God loves us and wants us to be happy.”
Ben Franklin |
|
|
|
|
baitkiller
Platinum Member
Joined: October-11-2011 Location: SW Florida Status: Offline Points: 1693 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 7:52pm |
|
I would try spoon cutting the key way. Sure couldnt hurt. My little 1 incher is spoon cut with a pinned key but the machinist is a friend. Does anyone know what shafting is in use? The Aquamet 22 though pricey is pretty dang tough stuff and usually specified for higher torque applications. I kind of doubt thats being used but I really have no idea.
|
|
|
Jesus was a bare-footer.............
|
|
|
|
|
8122pbrainard
Grand Poobah
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 8:58pm |
Why would the "bean counters" allow the PA to buy the good stuff for a 200K boat?
|
|
|
|
|
tryathlete
Platinum Member
Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1797 |
Post Options
Thanks(0)
Quote Reply
Posted: June-18-2018 at 11:30pm |
What’s wrong with splines? Keyway takes a lot of material out of the shaft. |
|
|
|
|
8122pbrainard
Grand Poobah
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
Post Options
Thanks(0)
Quote Reply
Posted: June-19-2018 at 7:41am |
A spline removes even more material plus it isn't a tight fit like a taper.  I think MC uses them because their owners would be mentally challenged to lap a prop to the shaft.
|
|
|
|
|
tryathlete
Platinum Member
Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1797 |
Post Options
Thanks(0)
Quote Reply
Posted: June-19-2018 at 7:46am |
|
Splines are ridges or teeth on a drive shaft that mesh with grooves in a mating piece and transfer torque to it, maintaining the angular correspondence between them. ... An alternative to splines is a keyway and key, though splines provide a longer fatigue life.
|
|
|
|
|
tryathlete
Platinum Member
Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1797 |
Post Options
Thanks(0)
Quote Reply
Posted: June-19-2018 at 7:54am |
|
A spline is a multiple keyway. Since you are spreading the torsional forces over multiple areas, you can decrease the induced stresses. This is shown in Machine Design texts like Shigley and Mischke.
The keyway isn’t supposed to transmit torque but when most dealers cannot properly lap in the prop to the shaft, I like splines better. |
|
|
|
|
8122pbrainard
Grand Poobah
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
Post Options
Thanks(0)
Quote Reply
Posted: June-19-2018 at 8:01am |
Sounds like you would be a perfect candidate for owning a MC.
|
|
|
|
|
tryathlete
Platinum Member
Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1797 |
Post Options
Thanks(0)
Quote Reply
Posted: June-19-2018 at 8:19am |
|
Pete
They make a good boat CC makes a better one though!😂 |
|
|
|
|
gun-driver
Grand Poobah
Joined: July-18-2008 Location: Pittsburgh, Pa Status: Offline Points: 4112 |
Post Options
Thanks(0)
Quote Reply
Posted: June-19-2018 at 10:55am |
|
|
|
|
|
Hollywood
Moderator Group
Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13510 |
Post Options
Thanks(0)
Quote Reply
Posted: June-19-2018 at 12:03pm |
|
Bravo
|
|
|
|
|
tryathlete
Platinum Member
Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1797 |
Post Options
Thanks(0)
Quote Reply
Posted: June-19-2018 at 12:15pm |
|
Turning a 1-1/4” shaft down to 1-1/8” at the End of the shaft and expecting nothing bad to happen shows some seriously weak judgement at some level, regardless of keyway/splines. 550 HP is a crapload of power! I wonder what the torque is on that beast.
|
|
|
|
|
DVskier
Senior Member
Joined: September-04-2014 Location: Seneca SC Status: Offline Points: 449 |
Post Options
Thanks(0)
Quote Reply
Posted: June-19-2018 at 12:23pm |
|
G series boats are wrecking shorelines everywhere they are operated. I have no sympathy for the owners who experience broken prop shafts. Usually operated while surfing with a beer laden crew who is jamming rasta music at deafening sound levels.
Legislation certainly has to be coming as our shorelines continue to erode. It may be different where you live. |
|
|
|
|
tryathlete
Platinum Member
Joined: April-19-2013 Location: Lake Villa, IL Status: Offline Points: 1797 |
Post Options
Thanks(1)
Quote Reply
Posted: June-19-2018 at 12:32pm |
|
Indeed the erosion problem is real. Any large boat driving bow up (cabin cruisers certainly outnumber wake boats) is going to erode the crap out of shoreline property. I get a bit nuts when my wife drives “slowly” in an effort to “take it easy”. No wake or on plane is the right way to motor.
|
|
|
|
|
Post Reply
|
Page 12> |
Tweet
|
| Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Topic Options
8122pbrainard wrote: