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  #11  
Old 07-22-2013, 07:02 PM
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mikeg205 mikeg205 is offline
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Quote:
Originally Posted by cruiser View Post
I did a lot of work on 30ft. plus chris crafts years ago with the same problems. If the shaft is straight, prop is straight and balanced and the key slot and key way are cut to proper depth. By this i mean put the prop on without the key in place and mark with a black marker, then remove the prop, install the key and replace the prop. It should go back on to the mark. If it does not you have to mark with hi-spot blue and scrape it in. If the prop does not go on to the same location, under load you can get a vibration from what we used to call Prop Wiggle.
Interesting write up - I'll have to check this out...
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  #12  
Old 07-22-2013, 07:36 PM
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AZDave AZDave is offline
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Yes. It looks like you unbolt it and pry it apart, but there must be more to it.
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  #13  
Old 07-23-2013, 07:36 PM
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Prop shaft ok. Coupler alignment at .010, tolerance .003 from manual. Slight vibration makes sense. Taking it to MC to adjust. Thanks for the help, I learned a lot...again
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  #14  
Old 07-23-2013, 07:47 PM
Cloaked Cloaked is offline
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What prop? CNC machined?
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Quote:
Originally Posted by Thrall View Post
..Some of you give a whole new meaning to the phrase "another @sshole with a Mastercraft."

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  #15  
Old 07-23-2013, 09:35 PM
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Acme 4 blade. CNC machined. When I installed it 7 years ago it helped smooth it out. When I put a new bushing on the raw water pump a few years back, that also helped. I think once the motor is aligned it should be pretty good.
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  #16  
Old 07-24-2013, 05:16 PM
Cloaked Cloaked is offline
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Quote:
Originally Posted by AZDave View Post
Acme 4 blade. CNC machined. When I installed it 7 years ago it helped smooth it out. When I put a new bushing on the raw water pump a few years back, that also helped. I think once the motor is aligned it should be pretty good.
Call it good. Done deal....I'd run with it and be happy.....

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Quote:
Originally Posted by Thrall View Post
..Some of you give a whole new meaning to the phrase "another @sshole with a Mastercraft."

RE: Thrall, Welcome to the club....
NEW SKINS in TN... Leading Edge Marine Interior

feedback on a TN company: http://www.mastercraft.com/teamtalk/...ad.php?t=58767

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  #17  
Old 07-24-2013, 05:21 PM
TRBenj TRBenj is offline
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Misalignment will not cause vibration... it will dampen it. It will, however, cause your strut bushings to wear unevenly- which will cause a (greater) vibration once everything is aligned properly.
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  #18  
Old 07-27-2013, 04:46 PM
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We will soon see. The boat was off about .010". Prop turns a little smoother now by hand. I guess if the vibration increases, the bushing will be the last thing to do. It is not like it ever had a severe vibration.
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  #19  
Old 07-27-2013, 04:54 PM
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André André is offline
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Good video on shaft-engine alignement...
http://www.youtube.com/watch?v=3_w0LvD6gEc
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  #20  
Old 07-29-2013, 02:42 PM
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Vibrating less following shaft to engine alignment. Very happy with boat operation now. Dealer said it was off. Took 20 years to need adjusting. I wish you could buy a brand new boat as simple and user friendly as these old ones. Hmmm, sort of like cars. Bells and whistles come with a price.
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