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Old 06-05-2013, 03:05 PM
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Brian B Brian B is offline
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First prop strike and vibration

While at lake Powell for Memorial Day I have a little run in with this sob!



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!
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Old 06-05-2013, 03:18 PM
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Damaged prop

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Old 06-05-2013, 03:22 PM
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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/...t+guage&page=3
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Old 06-05-2013, 03:24 PM
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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.
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Old 06-05-2013, 03:31 PM
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willyt willyt is offline
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brian, that damaged prop is definitely out of square
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Old 06-05-2013, 03:35 PM
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agreed, major distortion in the blades.

with that kind of damage i would supsect a bent shaft before blaming the spare prop.
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Old 06-05-2013, 03:35 PM
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Quote:
Originally Posted by rtw_travel View Post
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!
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Old 06-05-2013, 03:36 PM
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Brian B Brian B is offline
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Quote:
Originally Posted by willyt View Post
brian, that damaged prop is definitely out of square
The angle of the photo certainly helps it look out of square....
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Old 06-05-2013, 03:56 PM
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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.
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Old 06-05-2013, 04:12 PM
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Quote:
Originally Posted by cruiser View Post
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?
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