Zinc on 1968 McGlasson

[Wayfarer34]

I am privileged to have a 1968 Islander 34, only 14 of them built I believe. It is a great boat. There is a problem however. I cannot find a place to attach a zinc. The clearance between the prop and the shaft bearing is only 5/8 inch, nowhere near enough to put a collar zinc. Nor could the diver find any location on the rudder strut.

Any ideas on where to attach it? Where is the designed location for a zinc?

Incidentally, the diver reported that after more than a year of NOT having any zinc, the prop and shaft did not show signs of electrolysis, only some surface pitting.

Thanks,
Dave

 

[fstbttms]

Any ideas on where to attach it? Where is the designed location for a zinc?

This is what you want:

The zinc size appellation is determined by your prop shaft diameter. For instance:

3/4" shaft = "A" prop zinc
7/8" shaft = "B" prop zinc
1" & 1 1/8" shaft = "C" prop zinc
1 1/4" shaft = "D" prop zinc

etc., etc., etc.


Good online source for all things zinc:

BoatZincs.com (978-841-9978) – The Online Superstore for Zinc Anodes

 

[fstbttms]

BTW- I see that you are in Petaluma. If the boat lives in fresh or brackish water you do not want to use a zinc anode. You need aluminum or magnesium (freshwater only.)