Thread: Merc outboard lower cowling drain valve
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Wayne.B Wayne.B is offline
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First recorded activity by BoatBanter: Jul 2006
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Default Merc outboard lower cowling drain valve
On Sun, 09 Aug 2009 01:37:28 -0400, wrote:

If you are a lake boater you can get few years out of hot dipped
galvanized but bear in mind you are doing this because they are always
wet. In salt water you won't get a season out of them.
I can take some pictures of some stainless inflicted holes in
aluminum. They put stainless snaps in the rail on my boat and they
just fell out leaving a hole your thumb will fit in.

It may depend on the type of aluminum. Some alloys are more corrosion
resistant then others. Sailboats typically have aluminum masts and
booms with stainless hardware attached with stainless fasteners.
There are corrosion issues if the fasteners are not bedded properly
with silicone or never seize, but the usual failure mode is that the
fastener becomes corroded in place and can't be removed without
breaking it.

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