>> Re MAX Prop screws:.... "The screws are a special metric size so ordered new >> ones ( a buck each). Decided then that changing zinc during haul out made >> more sense since I could put a drop of Locktite on them - problem of lost >> screws/lost zinc solved."
MAX prop zinc mounting screws from PYI have a coating of blue Loctite on the first ΒΌ" to help prevent them from coming loose. If you are hauled out and re-use the screws it is a greatidae to renew the Loctite. If you change the zinc in the water as I often do the new screw's Loctite will not wash off during installation. I prep the 70mm MAX prop zinc to help prevent it from prematuraly falling off. First I file the bottom flat as the zinc casting is not always flat. Next I paint the very thin area around the outside of the mounting holes (not allowing any paint to block the zinc to prop interface). I used model paint. Avoid black as there seems to be an iteraction between the black coloring and the zinc/seawater. The paint prevents the very thin outer edge of the 70mm zinc from eroding sooner than the bulk of the anode and allowing a zinc with 50% of its life left to fall off. When installing the zinc I clean/lightly file the prop interface. I install and tighten the screws in a manner similar to lug nuts to obtain an even seating. I give a light tap with a hammer to be sure the zinc is seated. I am careful to get the screws tight but not to stress the threads in the prop hub. 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 David Blair via CnC-List Sent: Tuesday, August 04, 2015 8:54 AM To: cnc-list@cnc-list.com Cc: David Blair Subject: Re: Stus-List Best prop for 34+ Another small point. When I had a diver change the Maxprop zinc it later fell off because the retaining screws worked out completely. The screws are a special metric size so ordered new ones ( a buck each). Decided then that changing zinc during haul out made more sense since I could put a drop of Locktite on them - problem of lost screws/lost zinc solved. Cheers >>>> On Aug 3, 2015, at 9:14 PM, Jim Watts via CnC-List <cnc-list@cnc-list.com<mailto:cnc-list@cnc-list.com>> wrote: When you put a zinc on the shaft, there is normally a bit of slack in the whole assembly. This is usually fixed by whacking the zinc with a hammer to seat it on the shaft. Unless you back up the other side of the shaft with something relatively immobile, you stand a chance of bending the shaft. So, you hold a BFH (large hammer) on the back end of the zinc when you whack it. The thinnest part of the zinc is at the bridge between the two halves, so if you liberally coat those surfaces with paint, nail polish, or whatever, the zincs will not vanish and leave you with no protection. Jim Watts Paradigm Shift C&C 35 Mk III Victoria, BC
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