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It is currently Thu Jul 10, 2025 4:00 pm
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[ 5 posts ] |
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sulpher_river_runner
MMT Member
Joined: Mon May 28, 2012 3:41 pm Posts: 23 Location: East Texas
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 broke prop shaft
i have a 13hp lt only put about 6 hrs of deep water on it, and the 3/4 inch shaft snaped off were the threads started. is this common or just a bad shaft? shaft was done by a machine shop and made from 3/4 cold rolled, now having a shaft made from 4140 hardened steel.
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Wed Jun 27, 2012 6:58 am |
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Kja0792
MMT Pro Member
Joined: Tue Feb 21, 2012 2:36 pm Posts: 444
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 Re: broke prop shaft
Ive got a 7/8 cold roll shaft on my mb 35 put 30 hours on it in the mud mostly with no problems yet were all the bearings changed with the shaft? Maybe a bearing seized
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Thu Jun 28, 2012 6:55 am |
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Buzz Killington
MMT 1000 Club
Joined: Tue Jan 10, 2012 12:33 pm Posts: 2455
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 Re: broke prop shaft
_________________ Support your troops - they support you
B. MacDonald
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Thu Jun 28, 2012 6:56 am |
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sulpher_river_runner
MMT Member
Joined: Mon May 28, 2012 3:41 pm Posts: 23 Location: East Texas
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 Re: broke prop shaft
all the bearings were free, but went ahead and replaced everything that moves from the back of the motor to the lock nut on the bottom of the shaft. had a lil virbration before, but has nun now dont know if it is the new prop or what,
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Thu Jun 28, 2012 5:24 pm |
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Puddle jumper
MMT Pro Member
Joined: Fri Jan 20, 2012 11:56 pm Posts: 98 Location: Abita Springs, LA
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 Re: broke prop shaft
If it broke right behind the prop shaft housing the threads were machined too deep, your 3/4'' shaft may have been 1/2-7/16'' in the thread valley. Where did it break?
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Thu Jun 28, 2012 6:34 pm |
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