Cooling
System
INSPECTION
As a part of standard maintenance procedures, the
entire cooling system should be inspected for signs
of leakage and checked for worn components. In-
spect the water pump bearings, impeller (neoprene),
and seals for signs of wear, and check for correct
drive belt tension. Locate the source
of
any leaks and
correct as required. Inspect
the
zinc pencils on heat-
exchanger cooled engines, and note the amount of
deterioration. Refer to the appropriate section for
recommended service procedures.
As a final check, run the engine at full load and verify
that the engine can maintain an operating tempera-
ture of approximately 18OOF (82'C). An engine that
operates significantly above
or
below this value
should be tested for malfunctions.
IMPORTANCE
OF
REGULAR
MAINTENANCE
The entire cooling system, including the block and
radiator, heat exchanger,
or
keel cooler should be
cleaned and flushed out at least once a year. This is
especially important in cold weather conditions
or
when preparing the unit for extended storage (over
30
days). The cooling system can work efficiently
only when it is clean.
A
build-up of rust and scale
in
the cooling system will slow down heat absorption
and restrict water flow.
PRESSURE CAP
DRAIN
PLUG
DRAINING COOLING SYSTEM
Open all drains and hose connections where coolant
may be trapped when changing
the
antifreeze solu-
tion
or
when preparing a unit for storage in freezing
conditions. Open the fill vent valve when draining
heat-exhanger cooled engines. The following drain
plugs and hoses must be removed to drain the
cool-
ing system completely:
Contact with
hof
coolanf might
n
result in serious burns.
Do
not
bleed
hof,
pressurized coolant
from
a closed cooling
sysfem.
Engine
Block: J-Series-Remove drain plug on
left
front side of engine.
(See
Figure
6).
Wafer
Pumps
(All
Unifs);
Remove drain plug under
pump
or
loosen pump cover (Figure
6).
Exhaust Manifold:
Remove plug from underside of
exhaust manifold (Figure
6).
Expansion Tank:
Remove plug from front side of
expansion tank (Figure
6).
Heat Exchanger (Draining Raw Water or Sea Wafer):
Removedrain plug from underside, loosen end cover,
or
loosen and remove hose to drain heat exchanger.
TankHeafer:
Loosen and remove lower hose to drain
tank heater.
Aqualiff Muffler;
The Aqualift muffler
has
relatively
little water in it during normal operation and does not
have to be drained during freezing weather.
Replace and tighten all plugs, fittings, and clamps
when draining is finished.
t
L
DRAIN
BLOCK
HERE
(SOME
MODELS
HAVE
A
PIPE
PLUG)
EXHAUST
MANIFOLD
J-SERIES
BLOCK
FIGURE
6.
DRAINING COOLING
SYSTEM
REMOVEPUMP
COVER
TO
DRAIN
WATER
PUMP
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