Brad,

If you are planning on a typical PNW San Juan's and further north summer cruise 
you will be putting many hours on your auxiliary engine. (Summer in the San 
Juan's turns sailboats into slow power boats.)  Performing the full 
shaft/coupling repair now would be a good idea.

If you plan on a short motor out of the marina and then shutting down the 
mechanical propulsion you may be able to fit a larger woodruff key, larger set 
screws/bolts, and follow the other advice regarding placing a zinc forward of 
the shaft log in case the low budget repair fails.  If the coupling remains 
loose on the shaft expect additional vibration and wear on both the shaft and 
coupling plus a clunk when shifting between forward and reverse.

If you do go the "full monte" and pull the shaft, take a close look at your 
cutlass bearing as it would be easy to replace at the same time.

Martin DeYoung
Calypso
1971 C&C 43
Seattle

[Description: Description: cid:D1BF9853-22F7-47FB-86F2-4115CE0BAF2F]

From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Brad 
Crawford via CnC-List
Sent: Friday, June 05, 2015 11:16 AM
To: cnc-list@cnc-list.com
Cc: Brad Crawford
Subject: Stus-List Propeller Shaft Coupling question

I recently had my transmission out for a rebuild and upon putting it back in 
and the boat back together discovered that the propeller shaft coupling is a 
little loose on the shaft, maybe 1/8" of rotational movement on the shaft, like 
possibly the keyway is worn?.  Have tried tightening the set screws, which 
secures the coupling but eventually they work loose and again there is movement 
of the coupling on the shaft.  It's been recommended that I have the boat 
hauled,  the coupling removed,  the shaft pulled out and provided the shaft is 
ok, a new coupling fitted and faced to the shaft, and then reinstalled for a 
final alignment.

My question to the group is has anyone else been running around with a loose 
coupling and is this something I should be immediately concerned about?

Thanks,

Brad Crawford
CnC 36
Seattle

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