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  #1  
Old 05-17-2011, 03:43 PM
hadzinak hadzinak is offline
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broken prop shaft

My prop shaft broke for the second time on the couple side just after the coupler....
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  #2  
Old 05-17-2011, 03:47 PM
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OUCH!! How in the world did you break a shaft? Hit something with some force?
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1991 PROSTAR 190 Flagship Blue POWERSLOT OJ XMP CNC 13.7x17.5 .110 4B
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"It's better to keep your mouth shut and let people think you are stupid, than to open it and prove it"?
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Old 05-17-2011, 04:27 PM
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muskingumriverdocks muskingumriverdocks is offline
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Sounds like it's misaligned. Happened to my '74 SS once when the rubber came out of one motor mount.
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Old 05-17-2011, 04:47 PM
hadzinak hadzinak is offline
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misalignement...
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Old 05-17-2011, 04:56 PM
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ouch!!!! I'm sure your strut bushing needs replacing and possibly even the strut it self?
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1991 PROSTAR 190 Flagship Blue POWERSLOT OJ XMP CNC 13.7x17.5 .110 4B
A.K.A. One of a kind mistake
2011 Best In Show- 1987-2000 class

Trying to keep slalom alive

Need a new prop to fit your needs? Call OJ PROPS 800-359-9730

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"It's better to keep your mouth shut and let people think you are stupid, than to open it and prove it"?
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Old 05-17-2011, 05:36 PM
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Quote:
Originally Posted by hadzinak View Post
misalignement...
Who's doing the alignment? When I purchased my last used MC it had a bent strut. When I disconnected the coupling at the transmission, the shaft was a good 1/4 inch out of alignment due to the previous owner driving around with a bent strut. How far out of alignment do you have to be in order to actually snap a shaft in half????
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Old 05-17-2011, 05:43 PM
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Originally Posted by ahhudgins View Post
Who's doing the alignment? When I purchased my last used MC it had a bent strut. When I disconnected the coupling at the transmission, the shaft was a good 1/4 inch out of alignment due to the previous owner driving around with a bent strut. How far out of alignment do you have to be in order to actually snap a shaft in half????
If the shaft is out of alignment, it will create cyclical loading bending forces on the shaft as the shaft rotates. The more times the shaft rotates, the more load cycles the shaft goes through. Each loading cycle causes metal fatigue, and eventually a crack will develop and the shaft will fail.

I would think there would be some noticeable vibrations to go along with the misalignment long before the shaft failed, though.
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Old 05-18-2011, 12:31 AM
hadzinak hadzinak is offline
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it felt as if I was in an old truck as far as the vibrations go... The shaft snapped when I put it in reverse to park the boat. As far as I can see the bushing was good and the strut didn't have any visible problem. The lower broken part was rotating smoothly through the bushing/strut... Does a machine exist that can align the shaft or is it done manually ?
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Old 05-18-2011, 01:46 AM
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That's a nice pry bar ya got there!

Seriously, don't throw away the old prop shaft. There is NOTHING better to use when trying to push around the engine and trans when aligning them to the prop shaft... nothing ( ;
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Need LT-1 parts?
OIL FILTER: Factory installed is a Penzoil P23, Afta market brands, AC Delco PF-454 and a Fram PH-13 or PH-30 will work.
SPARK PLUGS: AC Delco MR43LTS (gapped to .040")
FUEL FILTERS: AC Delco 25171391 (pump inlet side)
89058397 (pump outlet side)
IGNITION WIRES: Call Inboard Online @ (877) 327-7175 and order part numbers 556010A (odd bank) and 556010B (even bank)
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Old 05-18-2011, 12:06 PM
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Quote:
Originally Posted by hadzinak View Post
it felt as if I was in an old truck as far as the vibrations go... The shaft snapped when I put it in reverse to park the boat. As far as I can see the bushing was good and the strut didn't have any visible problem. The lower broken part was rotating smoothly through the bushing/strut... Does a machine exist that can align the shaft or is it done manually ?
You are ze machine.

There are a couple good threads that describe the procedure... this one should help:
http://www.mastercraft.com/teamtalk/...ment+procedure

Also, there's a good document that describes the whole procedure. I managed to find and attach it.
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File Type: doc Prop Shaft Allignment.doc (32.0 KB, 65 views)
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