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 Post subject: Re: Shaft/alignment - possible problem.
PostPosted: 04 Nov 2014 08:25 
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Skipper

Joined: 20 Oct 2006 16:10
Posts: 687
Location: Out of Waukegan, IL
Thanks all. Looks like a new topic that I'll need to get familiar with. Seems to be one a year at this stage in the boat's existence. Some years it is fun and elective (new instruments), some years it's by need (Fuel injection pump).

Thanks for getting me started on my 2015 studies.

_________________
SMMO/First Mate aboard High Flight #299
1981 - Full Keel - Furling Main (A boat for the lazy crew...)


 
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 Post subject: Re: Shaft/alignment - possible problem.
PostPosted: 04 Nov 2014 19:29 
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Skipper

Joined: 29 Dec 2006 09:38
Posts: 656
I will just second the idea that we all should check alignment of the engine and shaft at the coupling (.003" is OK but bigger is a problem--loosen the top nuts and turn the lowers only a quarter turn at a time as it does not take much to make a big difference at the coupling) as this does shift over time with wear. Like the others mention, I have not noted a big alignment difference when the boat is in the water or out of the water---on a T37 it does not change much--though this can be an issue with some other, more flexible boats. I am convinced that most rear oil seal problems and transmission problems are really the result of running a misaligned shaft and engine---that vibration is not just annoying it is hard on the running gear. I also agree that you should get the shaft in the center of the tube if you can. In installing a new engine, you run a string through the center of the cutless bearing and the center of the tube to locate the position of the new engine (center of the engine coupling).
FWIW
Ray


 
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