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Brian B
06-05-2013, 03:05 PM
While at lake Powell for Memorial Day I have a little run in with this sob!

http://i28.photobucket.com/albums/c250/ultimatuc2/Memorial%20weekend%20at%20Lake%20Powell%202013/20130526_082247_zps498999a3.jpg (http://s28.photobucket.com/user/ultimatuc2/media/Memorial%20weekend%20at%20Lake%20Powell%202013/20130526_082247_zps498999a3.jpg.html)

We were just idling in at night and the engine shut down the second the prop hit. If you look at the prop you can barely see that it is damaged. Like not at all. But it did vibrate so I threw a spare on the next morning. I now have a slight vibration at speeds over 30 mph so I would assume I have a bent prop shaft.... ( I could very well have a slightly damaged spare prop I suppose )

Do the shafts typically bend at or near the prop?

What would be acceptable runout?

Degree of difficulty to change it?

Thanks for any input!

Brian B
06-05-2013, 03:18 PM
Damaged prop

http://i28.photobucket.com/albums/c250/ultimatuc2/Mastercraft%20X10/20130605_121253_zps568a44b8.jpg (http://s28.photobucket.com/user/ultimatuc2/media/Mastercraft%20X10/20130605_121253_zps568a44b8.jpg.html)

mikeg205
06-05-2013, 03:22 PM
I would check the prob - you can also use a needle gauge to see if shaft is bent. look at post #28

http://www.mastercraft.com/teamtalk/showthread.php?t=54382&highlight=shaft+guage&page=3

rtw_travel
06-05-2013, 03:24 PM
It's a rogue rock! Been there, done that on a previous boat.

What is the history of the spare? Most people's spares are previously damaged props.

willyt
06-05-2013, 03:31 PM
brian, that damaged prop is definitely out of square

aquaman
06-05-2013, 03:35 PM
agreed, major distortion in the blades.

with that kind of damage i would supsect a bent shaft before blaming the spare prop. :(

Brian B
06-05-2013, 03:35 PM
It's a rogue rock! Been there, done that on a previous boat.

What is the history of the spare? Most people's spares are previously damaged props.

It was the spare that the previous owner had so you may be right..... My local dealer is lending me a prop this week to try!

Brian B
06-05-2013, 03:36 PM
brian, that damaged prop is definitely out of square

The angle of the photo certainly helps it look out of square....

cruiser
06-05-2013, 03:56 PM
Use a dial indicator. Make sure your strut bearing is good, (don't want any shaft play.) Turn the shaft and watch the indicator. .000/.003 is within tolerance. any more you will need it straightned by a machine shop with capabilities.

Brian B
06-05-2013, 04:12 PM
Use a dial indicator. Make sure your strut bearing is good, (don't want any shaft play.) Turn the shaft and watch the indicator. .000/.003 is within tolerance. any more you will need it straightned by a machine shop with capabilities.

Thanks! How hard is it to pull out?

mikeg205
06-05-2013, 04:20 PM
Thanks! How hard is it to pull out?

depends how corroded the coupler is. There's a bunch of threads with people removing there drive shaft. if you take out the drive shaft change the cutlass bearings while you are at it.

cruiser
06-05-2013, 04:31 PM
Not hard. when i had cabin cruisers a bunch of us made a slide hammer out of an old shaft. we threaded it for the end of the shaft and used a slide made of brass.

mikeg205
06-05-2013, 05:00 PM
check this out.

http://www.youtube.com/watch?v=3zZ2mSH_Ncc

here's a tool - $183 bucks.. http://www.skidim.com/products.asp?dept=1172

Brian B
06-07-2013, 11:58 PM
Thanks for all the input guys! Borrowed a new prop and going to give it a run tomorrow! Got my fingers crossed!

CC2MC
06-08-2013, 10:23 PM
Add me to the list of first prop strikes. I put the boat in the water this morning after skiing behind my neighbors SN. The boat sat all day and I did not run it once. This was due to the fact we had some company and they were the laid back float in the water and ride in the pontoon type, so needless to say the ole MC got a break this weekend. Before I put it back on the trailer, I made a short run around and managed to find a log floating. It was about 5" in diameter, but I think it must have been pretty soft, bc after I hit it, there were two pieces. I was pretty worried that I just bent my prop or did something even worse, but I took it up to WOT with seemingly no problem or vibration. I took it out and looked at it pretty hard, but I think I got pretty lucky. I could see where I struck the log, bc it scratched the prop slightly, but it does not appear to be bent at all. That sure is a bad feeling when you just hear clunk, clunk after striking something in the water.