Shaft Packing
Scott, I read and reread that ad and I didn't see any spec on what the
material is.. I seem to remember that the "G" stands for graphite and
graphite isn't compatable with salt water and stainless shafts.
In my experience in the US Navy, graphite packing was only used on steam
packing glands because of this problem.
I'm using teflon impregnated packing and have for the last 15 years. No
complaints here. I do an adjustment at the beginning of each season and at
the end, if there is any leakage, more than a drip.. Personally I have no
problem with a little water in the bilge because I have a deep sump and need
to hear the pump start a couple times a day, just for the sake of my
confidence.
With any packing material, you shaft must be smooth in the gland area and
most important, your engine should be properly aligned.. Engine/shaft
alignment needs to be checked after new engine mounts have been in service
for about a season and then about every time you relaunch after being on the
hard. Not that being on the hard would effect it that much but it's just
about the right period of time and a way to make sure the yard didn't effect
it by the way she was blocked.
ABYC has a good section on shaft alignment limits. Don't assume that a flex
coupling eliminates the need for alignment verification.
--
My opinion and experience. FWIW
Steve
s/v Good Intentions
|