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Your boat has been covered, out of sight
and out of mind for several months.
The weather is getting warm. You're itching
for the wind in your face again.
But what has happened to your boat over the
winter?
Start the season right
There are several types of start-of-the-season problems that
can be avoided with a little attention. Sinkings and engine and
drive failures are the most common. To be safe, here are some things
you should check.
Sinkings at the dock
Sinkings at the dock commonly result from failures in two areas:
shaft seals and through-hulls. A bilge pump cannot be relied upon,
nor was it designed to keep your boat from sinking. Float switch
failure, power outages and dead batteries can all shut down a bilge
pump and allow a boat to sink.
Shaft seals
Leaking shaft seals are probably the most common reason for sinkings
at the dock. Packing wears out, sometimes quickly, and must be checked
regularly, preferably after every use.
Packing glands
Check the packing gland on your propeller and rudder shafts.
A couple of drops of water leakage is allowable, but any more and
you should tighten the packing gland or renew the packing material.
Nothing is worse than getting a call from
your marina that your boat is swimming with the fishes. Repacking
depends on your use. Every year or at least every two years is the
recommended frequency.
If the packing gland is difficult to access,
consider having it repacked each year or replacing it with one of
the dripless models on the market.
Through-hulls
Any place there is a hole in a boat is called a through-hull. When
it's near or below the waterline, it can cause a sinking.
Sometimes the cause is UV deterioration of plastic through-hull
fittings. This can cause the fittings to crack just inside the outer
ring, visible from the outside. The bilge pump fitting can break
off and the bilge water is then recycled until the boat settles
low enough for the water to enter through the broken fitting.
The manufacturers of the plastic fittings don't say how long they
should last, but if yours are more than 10 years old, consider having
them replaced.
On the inside of your boat, the sea cocks attached to the through-hulls
also need attention. Sea cocks are the valves that require only
a quarter turn between fully open and fully closed. Make sure they
are greased and work easily.
Gate valves are sometimes found on through-hulls. They are not
generally suited for marine use because the various metals used
in their construction can result in galvanic corrosion. They require
complete disassembly and lubrication annually to keep corrosion
in check.
Hoses and clamps
Hoses and clamps also need to be checked. If hoses are soft,
cracked, or brittle, they need to be changed.
All hoses to through-hulls should be double clamped. Stainless
steel hose clamps are thin and susceptible to corrosion. A second
clamp is a cheap way to ensure against a hose coming off the connection.
Engine and drive failures
Sometimes engines overheat on the first trip of the season. Unfortunately
the cause is often a cracked block from poor winterization, and
spring is too late to fix that problem.
Overheating can also be from a water pump impeller failure. Over
the winter, the vanes on the neoprene impellers may mold into a
bent shape and then break when the engine is run. Replacing the
impeller each year will avoid a costly engine repair. Always have
spare impellers aboard.
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