more dangerous in fresh water. Unplug your boat immediately
and talk to your marina management, with the term “liability” in
your conversation. While they get the outlet wired correctly, buy
yourself an outlet tester (around $10 locally or from Amazon) and
check this outlet and every outlet you use for both proper ground
and proper polarity every time before you plug in. (You’ll need
an adaptor to plug a tester into a standard shore power outlet. If
you continue to leave your boat plugged in, you should consider
installing a galvanic isolator.)
(Continued from page 51)
Drinking Down A Sand Smoothie
I have twin crusader engines in a 1976 Gibson in the
Mississippi River. Last year I ran aground on a sandbar; at first the
starboard engine ran about 40 degrees hotter than normal. Also,
the left bank of this engine felt hotter than the right and the water
discharge reflected that. I changed the impeller and thermostat;
that made some difference. The port engine ran normal. Several
weeks ago on a short cruise, the port engine went to 180 degrees.
Exhaust water was fine at first, then after warming up, water flow
was minimal and temp stayed at 180 to 190. I replaced the impeller, checked the oil cooler for blockage (OK), checked thermostat
(moved freely), removed one drain plug on block (little or no
the sand (or lack of water) caused your impellers to shed rubber,
those impeller bits are downstream somewhere still restricting
flow. Sand-loaded water also can wear the inside of the pump
housing so that the seal between impeller and housing becomes
so degraded the pump has inadequate pumping capacity to meet
the cooling demands. Most likely, sand is clogging the cooling passages in your engine; not only does this result in overheating, but
where passages are blocked or restricted, you can have damaging
hotspots. Back flush all the cooling passages inside these engines.
Depending on the raw-water plumbing, this may not be that difficult, but you have to dislodge whatever is blocking the passages.
Compressed air may be helpful.
Leaking Mast Step
The mast step on my 1992 Hunter Passage 42 leaks. The tech
folks at Hunter recommend unstepping the mast and redoing it
as they did when it was new. I can’t get this done right now. Any
suggestions? — Allen Meador
— Kent Smith
Don Casey: If the engines ran cool before the grounding and hot
after, sand is the problem. When grounding in sand, almost everyone tries to reverse off. That inevitably feeds the raw-water pump
a sand slurry. There are multiple possibilities, but all related. If
Tom Neale: I’m assuming your mast is stepped on deck. If the
mast is stepped on the deck and the deck is leaking under or
around the step, you may have a dangerous structural problem
that should be addressed by a qualified yard in consultation with
the manufacturer. The cause of the problem may be minor, such as
a leak in the wiring passage, but this would still probably require
unstepping the mast and other serious damage could have resulted
from the leak. If the mast comes through the deck and is stepped
on the keel, and the leak is where the mast comes through the
deck, follow the manufacturer’s recommendation where you can.
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