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Prop gone to the bottom of the river, and back! |
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DayTony 
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Joined: June-30-2013 Location: Salem MA Status: Offline Points: 830 |
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 Posted: April-21-2015 at 2:56pm |
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did you hit something? it sure doesn't look like it from the looks of that wheel.
It almost looks like a problem with metallurgy or you are running a way too big prop and way to much Torque through that shaft. I'm confused now of how this could have happen. If it was over tightened it would have broke at the shoulder of the threads, not where it broke. |
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1988 Barefoot nautique-454
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Toertel
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Joined: August-26-2013 Location: Atlanta Status: Offline Points: 775 |
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Posted: April-21-2015 at 3:03pm |
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Prop is just dirty from the mud in the river
Looks like material related failure of the shaft Looks like initial failure is on the side of the keyway The smooth area is the fatigue zone whichh developped over time The rough part is the instantaneous rupture area |
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1994 Sport Nautique
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kapla
Grand Poobah 
Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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Posted: April-21-2015 at 3:05pm |
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hit nothing, just went into reverse and the prop went away...
prop is in the range for the boat with 310 hp after looking the picture looks like the prop was only seating in the upper part of the tapper, could that have caused to much stress in that area to finally crack the material? i remember upon install i had to grind some high spots...this was almost a year ago... |
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<a href="">1992 ski nautique
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Morfoot
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Joined: February-06-2004 Location: South Lanier Status: Offline Points: 5311 |
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Posted: April-21-2015 at 3:15pm |
Makes since to me as a professional wrench monkey. I'm no metalurgist but looks it does look like metal fatigue at the fracture. Would the discolorization of the metal be a clue? If so it's a 'Here's you Proof' of the impotance of proper propeller lapping to the shaft is. 
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"Morfoot; He can ski. He can wakeboard.He can cook chicken.He can create his own self-named beverage, & can also apparently fly. A man of many talents."72 Mustang "Kermit",88 SN Miss Scarlett, 99 SN "Sherman"
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kapla
Grand Poobah
Joined: March-27-2008 Location: BA, Argentina Status: Offline Points: 6148 |
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Posted: April-21-2015 at 3:17pm |
 duhhh
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<a href="">1992 ski nautique
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kapla wrote: