TABLE
2.
COOLING REQUIREMENTS
MODEL
3.0MDJA
6.OMDJB
7.5MDJE
12.OMDJC
15.OMDJF
MINIMUM
ENGINE WATER
Direct
*kW
Cooling
RATING (Sea
(MARINE
.
Water
DUTY) System)
3,000 3.4
6,000
3.8
7,500 3.8
12,000
4.0
15,000
4.0
Exchanger
or
Keel
Cooler
(Sea Water
3.66
I
3.0
3.0
4.7
4.7
HEAT
EXCHANGER
COOLING
AVAILABLE
FROM
ONAN
YES
YES
YES
YES
YES
COOLING
SYSTEM
CAPACITY (PT)
WITH
HEAT
EXCHANGER
4.5
9
9
19
19
Test
at
full
load
Captive Water
A second pump (metal impeller type) is required for
the captive water system on engines that have heat
exchangers or keel coolers. This pump circulates
enginecoolant continuously through the waterjacket
to the heat exchanger
or
keel cooler. Check all hoses
for kinks or bends that could restrict the water flow
and correct as required.
CONNECTED
\
.
SEA
WATER
7~_
1
INPUT
TO
EXHAUST
MANIFOLD
APPLY
PIPE
TO
ALL PIPE
HIGH EXHAUST
TEMPERATURE
EXHAUST
ELBOW
'ASSEMBLY
\\
EXS-1014
FIGURE
13.
EXHAUST
ELBOW
WATER
COOLED
EXHAUST
Marine exhaust systems are designed
so
that a
minimum amount of heat will be radiated from the
exhaust system components. This is done to keep the
heat build-up
in
the engine compartment to a mini-
mum. Exhaust heat is dissipated by using a water
cooled exhaust manifold and a water injected exhaust
pipe and muffler system. The exhaust manifold is
encased
in
a shell through which engine coolant or
sea water is circulated. Just beyond the exhaust
manifold, a special elbow (see Figure
13)
is fitted
which allows the output water from the sea water
system to be injected into the exhaust pipe. The
injected sea water is carried out through the exhaust
system and discharged.
Typical Installations
All water injected exhaust systems must be designed
so
that the discharge water will not flow back into the
engine. There are several methods that can be used
to keep water out
of
the engine.
All
are based on
injecting the water at a point a few inches (approxi-
mately4
[lo2
mrn])
belowtheexhaust manifold outlet
and installing a sharp
drop
in
the exhaust line that
water cannot normally flow over.
21
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