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- Newsgroups: rec.boats
- Path: sparky!uunet!destroyer!cs.ubc.ca!mprgate.mpr.ca!mprgate.mpr.ca!kell
- From: kell@mprgate.mpr.ca (Dave Kell)
- Subject: Re: Question about zinc...
- Message-ID: <1992Nov16.172432.12284@mprgate.mpr.ca>
- Sender: news@mprgate.mpr.ca
- Reply-To: kell@mprgate.mpr.ca (Dave Kell)
- Organization: MPR Teltech Ltd.
- References: <1992Nov16.141043.14356@cs.brown.edu>
- Date: Mon, 16 Nov 92 17:24:32 GMT
- Lines: 38
-
- In article <1992Nov16.141043.14356@cs.brown.edu>, jfh@cs.brown.edu (John F. Hughes) writes:
- |>
- |> The result: after 5.5 months in the water, the zinc is about
- |> 25% gone. Is this about normal?
- |>
-
- I put two or three of the football-shaped zincs on my shaft, and I find that
- I go through at least two of them per year. The boat's in the water year round.
- From talking with people at our marina, it seems that it depends who your
- neighbors are. One guy in our club was going through 3 every six months.
- After moving to a new slip in the same marina, he goes through 2 a year. My
- boat has no shore power, so I doubt I'm the main problem, but most boats
- around mine are plugged in, and some of the ground connections are somewhat
- doubful.
-
- Q: Can you have TOO MUCH zinc on your boat? I can't see how it could be a
- problem, but I seem to be the only one around who puts three on his shaft.
-
- |> Also, on the engine itself, there's a heat exchanger.
- |> The result: usually the zinc is almost completely gone; the pencil has
- |> broken off somewhere in the middle, and the "stub" is lying around on the
- |> bottom of the exchanger, along with sundry other bits of broken zinc.
- |>
- I believe this zinc prevents the baffles in the heat exchanger from corroding
- through, so that the fresh-water part of the system stays closed. Some heat
- exchangers don't have them, and they eventually fail due to corrosion.
-
- My engine's raw water cooled :-(, so I can't comment on the frequency of
- replacement.
-
- dK
- ===========================================================================
- Dave Kell (604) 293-5753 kell@mowgli.mpr.ca
- MPR Teltech Ltd. mprgate.mpr.ca!kell@uunet.uu.net
- 8999 Nelson Way
- Burnaby, BC, CANADA
- V5A 4B5
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