NS ION
TANK
ENGINE
EXHAUST
MAN
I
FO
LD
EXHAlJST
LINE
FIGURE
11.
KEEL COOLER
WATER
FLOW
During normal operation, marine cooling systems
intake a greater amount of dirt and sediment than
would beexpected with radiator or city water cooling
systems. This contributes greatly to water pump wear
and increases the chances that water passages will
become clogged or restricted.
It
is important with
marine cooling systems that the water flow be
checked frequently to insure that adequatecooling is
maintained.
Sea
Water
All marine cooling systems (except keel coolers with
dry stack exhaust) require a continuous flow of
sea
water for adequate cooling. Anything that reduces or
blocks the flow of water in the sea water system may
cause overheating. Remove the filter screen (Figure
12)
from the water filter on a periodic basis and clean
away any accumulations of dirt and sediment. Flush
clean water through the screen before replacing the
filter. Also, check all hoses and pipes to make sure
there are no kinks or bends that could restrict water
flow.
When the boat is dry docked, the water inlet strainer
(located on outside of hull) should also be checked
for accumulations of debris and cleaned if necessary.
The water inlet should not be directly
in
line with
other water inlets as this could reduce the amount of
water received bythe unit when the boat is underway.
If
more than one inlet is present, they should
be
staggered.
RECOMMENDED FLUSH TYPE THRU-HULL
FITTING AND WATER FILLER
TO
ELECTRIC PLANT
FLUSH THRU-HULL
FlTT ING
WARNING.
DO
NOT USE SCOOP TYPE WATER
INLET FITTINGS ON ELECTRIC PLANTS USING
AQUALIFT MUFFLER SYSTEMS.
FIGURE
12.
TYPICAL MARINE WATER FILTER
DO
not use a scoop-type wafer inlet
lzz3
fiffing. When the boat
is
underway
and fhe generafor sef
is
not running, sufficienf ram
pressure can force wafer past the sea wafer pump,
flooding the exhaust system, and possibly flooding
the
engine cylinders.
Beforestarting operation, theseawater pump should
be primed and checked for water flow. The punp is
primed by removing a priming plug on the top of the
pump (not necessary with metal impeller pumps) or
by removing the outlet hose from the pump con-
nection. Fill the pump and hose with water and
replace the components. With the set running, check
theexhaust outlet to verify that the pump is delivering
water. An insufficient flow
of
water indicates that
there are obstructions in the system, the water pump
belt is loose, or the water pump is faulty. Inspect and
replace any hoses or pipes that have become
re-
stricted or blocked. Refer to the section on
Water
Pumps
for water pump service procedures.
The minimum water flow requirements (in
GPM)
for
sea water systems are given inTable2. If necessary, a
test can be made to determine if the water flow is
adequate. Run the engine and use a pail to catch the
water that is discharged at the outlet connection on
the exhaust elbow during a
15
second period. Mea-
sure the number
of
gallons collected and multiply
that amount times
4
to obtain the flow rate in gallons
per minute. Compare with theamount shown inTable
2
to determine if the flow rate is sufficient.
Do nof run the generator set for
Ex3
more fhan one minute if the cooling
sysfem
is
fauify. Doing
so
can resuif in damage
to
water-cooled exhaust sysfem componenfs
as
well as
to the engine.
CAUT,ON
L
20
Redistribution or publication of this document,
by any means, is strictly prohibited.
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