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  #31  
Old 08-06-2009, 10:20 AM
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c_craig c_craig is offline
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Boat: 2008 X-15, 1993 Prostar S&S
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Oh, and yes, my mother-in-law got a kick out of seeing my brand new X-15 being towed across the lake by her 20 year old Tristar!
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  #32  
Old 08-07-2009, 08:18 AM
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c_craig c_craig is offline
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Originally Posted by c_craig View Post
Different issue, but started my day reading this thread. At 3pm that afternoon I heard a huge CLUNK, and instantly had no power. My son was riding and we were idling back to pick him up, so no major speed or RPM involved at that moment. Didn't know what had happened, but asked Jack to see if the prop was still there, check. Towed to the ramp and trailered, to find that the shaft was loose in the hull (moves in and out). After reading this thread, I figured for sure I had broken the shaft, although no strikes and nothing appeared to be bent or damaged. After a sleepless night, I took the boat to the dealer first thing a.m., and a suggestion by my home dealer to check the Nylock nut at the tranny proved correct. It had come off, and ultimately, at idle reverse, it pulled out and impacted the rudder. We reinstalled the nut with fresh locktite to fix. I told the dealer about my fear of having broken the shaft and reading this story the day before, and he says, oh you mean that boat over there? Too weird. The yellow X-10 was right there.

So first of all, cheers to the folks and Boat House Marine for over the phone, after hours diagnosis, and to the great guys at Action Water Sports in TC, Michigan for the quick fix.

Questions. Has this happened to any of you before with V-Drives? Why is there no pin in that nut? Would you feel secure re-installing the same nut that failed the day before? I assume it has been working its way loose for some time, but I think I would have noticed the shaft moving even a little bit when engaging reverse.

Hope to hear your thoughts on this.
Bump... Nothing?
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  #33  
Old 08-07-2009, 08:27 AM
Ben Ben is offline
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Boat: '94 PS205 LT1
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Originally Posted by haguepalmer View Post
have you loaded it on the trailer lately and missed the center of the bunks? it might not leave a mark but could bent it like that.
Or - a higher possiblity, did you crank up the lift with the boat too far enough forward? My guess is the rear crossbar to your lift is within a few feet (or less) to the strut. Check the bottom of the strut and top center of rear lift crossbar for witness marks.
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  #34  
Old 08-07-2009, 12:49 PM
FrankSchwab FrankSchwab is offline
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Boat: 1998 Maristar 200VRS
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Originally Posted by c_craig View Post
Bump... Nothing?
Don't know why you aren't getting a response...Maybe it would have been better to start your own thread rather than piggybacking on another one that most people have already read, and may not return to.

I wouldn't trust the nut. In the airplane world, Nyloc nuts are replaced and not reused. For something as critical as the propshaft, I'd recommend the same. If you put threadlocker on it, you're probably OK, but I'm not a boat mechanic so don't rely on me.

I've heard of only one other similar problem in the 4 or 5 years I've been on this forum, so it doesn't seem like a common issue. A cotter pin would seem like an excellent belt-and-suspenders enahancement.

/frnak
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  #35  
Old 08-07-2009, 01:00 PM
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kawagaskier kawagaskier is offline
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Boat: MasterCraft, Stars and Stripes, 1985, 351W, Powerslot
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Quote:
Originally Posted by c_craig View Post
Bump... Nothing?
I recently went through the identical scenario in my S&S. Stopped to pick up a skier, put it into reverse and clunk clunk clunk... and no power transmitted.. Towed the boat to the landing and once it was on the trailer noticed that the prop and shaft were slid back against the rudder. I decoupled the shaft coupler at the transmission and the nut (castle nut) was lying in the coupler. Reset the key, tightened the nut and installed a new stainless cotter pin that I am guessing should have been in there from the start. Back on the water in about 1/2 hour. Not sure if there was never a pin, or a previous owner just neglected replacing it after having the shaft out... Will never know.
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  #36  
Old 08-07-2009, 01:01 PM
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JimN JimN is offline
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If a nut already backed off, it needs to be replaced, period. The fact that it backed off means that it's useless.
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