Daniel,
If you decide to remove the keel and inspect the bolts, I for one would be
very interested in their state. I personally believe that malleable iron or
manganese bronze is the keel bolt of choice and that the use of SS is very
dangerous for the reasons stated in my other thread. However, there are many
others that don't feel this way. Your inspection could go a long way in
determining which school of thought is correct.
Steve

"Daniel" wrote in message
...
I recently hauled my boat and after few days I noticed allarming coloured
streaks oozing out of the thin crack (very thin and of little concern by
itself) between the keel and the hull.
The colour of the streaks is green-blueish, something that suggests copper
sulfate, and sort of shiny that suggests micro-cristals.

According to the boat makers the keel bolts are AISI 316 SS and the keel
is of lead.
The boat was made in 1978.

Do you have any suggestion? Do I have to drop the keel and check the
bolts? I would rather avoid it, if not really necessary.

Thank you
Daniel

Hi

Is the sound sound when you knock on the top of the bolts with a
hammer, do they all response with the same sound ?
Lead and ss with no deforming of the wood , with no black water with no
strange coloring of the wood around --- well I guess that the lead
protected the ss well , --- one are in the plus and the other in the
minus end of metal catalys ability ,acturly the lead would protect the
rods , in such cases what you realy shuld look at is the nuts not the
rods.
---------- If there are any corosion there will be miscolored wood not
just a profe that the seames are well copper sulfated , there shuld be
a huge quantity of iron salts , are there ? If there are any corrosion
you will hear it instantly as bolts corode in different stated , one be
good another almost gone they will respond with a click or a knock
depending how much material left. Damn plain steel bolts been lasting a
century , this is even ss progerly a place where the only metal near
by, are one that acturly protect the rods.
Listen to them look if there are any dameage on the wood ,if huge
amounts of iron salts are miscoloring the wood ---.
Don't repair it if it's not broken.
P.C.

Manganese bronze is not a good choice for underwater. Silicon bronze is far
more stable.