Quote:
Originally Posted by aboutgone
And zinc's do nothing on the shaft in the engine room!!!!!
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This is absolutely NOT the case!!!
In the
photo I posted, you can see that the doughnut zinc is nestled up against the SS rotor on my PSS
shaft seal, (with a very thin bead of caulk on their faces).
The SS rotor had previously slid up the shaft, because the rotor's set screws had become rounded. This let about a foot of
water into the boat, and if we had not been a
trimaran, it would've sunk!
After replacing the rotor, I put on the
interior zinc as a "back up", to make sure the SS rotor can NOT move again. THIS Zinc has NOTHING to do with the prevention of galvanic
corrosion, And I suggest that anyone with a PSS dripless
shaft seal, install the backup zinc in this location. It's
cheap insurance!
FOR
CORROSION PREVENTION:
In the
photo, you can see the "shaft brush". This electrically connects the top, "interior" part of the
bronze strut, to the shaft, with a section of wire. (Connecting the wire to the
engine itself is unreliable, due to "hit & miss" continuity, created by greased
transmission bearings). With the Strut now connected to the shaft "electrically", the shaft zinc that is just forward of the prop, protects the prop, shaft, AND strut!
Mark