SailNet Community - View Single Post - Contemplating a drive line overhaul
View Single Post
post #27 of Old 11-02-2011
Maine Sail
Senior Member
Maine Sail's Avatar
Join Date: Jan 2003
Location: Maine Coast
Posts: 6,435
Thanks: 23
Thanked 311 Times in 241 Posts
Rep Power: 18
Originally Posted by eherlihy View Post
Contrary to what I believed above, there is NO bore reducer used in this application.
Bore reducers are a band-aid approach to fix an issue that should have been fixed by having a matching prop bore tape and shaft sized to that prop. There is no need for one so why complicate matters by installing one.

Originally Posted by eherlihy View Post
The guy that I dealt with at NE Prop, said that a propeller shaft zinc would take care of any galvanic corrosion. (I don't think so...)
That is the whole purpose of the shaft zinc. Millions of boats out there with manganese bronze props and SS shafts and the only times you see real issues is when there is a DC leak issue, a hot marina or the owner painted the prop with copper bottom paint.. If you keep up with the zinc you'll be more than fine. Just be aware that the PSS, as can GFO packings, may accelerate zinc erosion as the carbon/graphite is very, very noble..

Even your bronze shaft was connected to a steel coupling, which was then connected to an engine with, steel, aluminum, brass, copper and other alloys in it.. That's why you use a zinc..

Even if you try and isolate a shaft with a drive saver you are going outside ABYC P-06 suggested practice, if your engine is ship ground, as most are..

-Maine Sail / CS-36T

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Images In Posts Property of Compass Marine Inc.

Maine Sail is offline  
Quote Share with Facebook
For the best viewing experience please update your browser to Google Chrome