4-12
Heat Exchanger
WARNING
Accidental or remote starting can
cause severe personal injury or death. Discon-
nect the negative (–) cable from the battery to
prevent the engine from starting.
The heat exchanger has a cleanout cover and drain
plug (Figure 4-10). Clean the raw water tubes if the
engine keeps shutting down (Code No. 1) or the en-
gine gauge indicates abnormally high engine tem-
peratures. Drain the heat exchanger of if there is a
danger of freezing when the genset is not running or
is in storage. (Freezing water can damage the raw
water tubes in the heat exchanger. Engine coolant,
but not raw water, is protected from freezing.)
Cleaning and Draining the Heat Exchanger:
To
clean the tubes or to drain raw water, first remove
the end enclosure panel or the raw water pump
(p. 4-10). Have towels and containers ready to pre-
vent spilling raw water on the electrical components
below the heat exchanger.
Remove the drain plug or cleanout cover. Clean and
flush the tubes. The drain plug must be removed to
get all the water out of the tubes. Do not use metal
rods to clean the tubes. The tubes are made of rela-
tively soft copper alloy and can be damaged.
Use thread sealant on the drain plug and a new
clean out cover gasket if the old one is torn or other-
wise damaged. Reassemble all the parts that were
disassembled for access.
Removing/Installing the Heat Exchanger:
Re-
move the heat exchanger and have it cleaned at a
radiator shop if there is hard scale in the tubes.
To remove the heat exchanger, first disconnect the
two leads at the flow sensor, remove the sensor and
disconnect the three hoses. (To work the coolant
hose elbow off the fitting on the heat exchanger, it
will be necessary to loosen the hose clamps on both
ends.) Then remove the four mounting bolts and
withdraw the heat exchanger.
To install the heat exchanger, first clean the mating
gasket faces, taking special care not to scratch the
face on the aluminum manifold. Use a new gasket
and torque the mounting bolts to 19 lb-ft (26 N-m).
Then install the flow sensor using pipe thread seal-
ant and reconnect the two leads in the harness. Re-
connect the hoses and reassemble all the parts that
were disassembled for access.
DRAIN PLUG
CLEANOUT
COVER
FLOW SENSOR
MOUNTING BOLT
(1 OF 4)
FIGURE 4-10. HEAT EXCHANGER
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Summary of Contents for MDKBH Series
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