Join Date: Jan 2003
Location: Maine Coast
Thanked 303 Times in 235 Posts
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Re: Shaft Question
The shaft at the prop nut end looks to be suffering quite badly from dezincification...
If there is any wear on the shaft and dezincification is present replace it. If you remove that coupling you will almost certainly NEED to replace it. Straight couplings need to be a light press / interference fit.... Even the smallest layer of rust broken free changes this from an interference fit to a clearance fit. Clearance fit = BAD...... I suspect your friend is being penny wise pound foolish.... Those old Tobin bronze shafts had lots of zinc in them. When they turn coppery colored, like the nut end of that shaft, they are usually toast.
-Maine Sail / CS-36T
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