RCCK
Cooling
System
DESCRIPTION
The RCCK cooling system is a closed system which
uses an engine mounted pump to draw and circulate
coolant through the engine and radiator.
Water from the radiator enters the pump located on
the front
0ftheengine.Thepumpdelivers
waterto the
cylinder jacket and
it
flows through thejacket'and out
of the cylinder heads to the radiator. The waterflow
is
controlled by thermostats. For engine warm-up, with
thermostats closed, a by-pass between the cylinder
heads allows water flow.
.C
'
MAINTENANCE
Cooling system maintenance includes periodic in-
spection for leaks, and flushing and cleaning.
FLUSHING
The cooling system must be kept clean to function
properly. Scale reduces heat transfer and restricts
water flow. Flush the system at least once a year and
more often if operation indicates clogged passages,
pump wear, or overheating.
To
flush the engine, remove both thermostats, Figure
23. Attach a flushing gun nozzle to the thermostat
opening and fill the block with water; then apply air
pressure. Repeatthe process until watercoming from
the block is clean.
FIGURE
23.
THERMOSTAT REMOVAL
CLEANING
To
clean the cooling system, drain and
fill
with
radiator cleaner. When chemical cleaning is done,
always flush the cooling system to wash out deposits
loosened by the chemical cleaning. Flush the engine
water jacket as previously discussed. When flushing
is completed, check the system thoroughlyfor leaks.
REPAIR
When making cooling system repairs, use Permatex
or
other thread-sealing compound on all threaded
connections.
All water lines should be 1/2 inch
(13
mm) inside
diameter or larger. Long runs
of
pipe or hose need a
larger inside diameter to reduce resistance.
Water
Pump:
Refer to centrifugal pump repair in
MCCK
COOLING
SYSTEM
for repair procedures.
Thermostats: A thermostat is located on the top of
each cylinder head. Replace thermostats that are
damaged from corrosion or other causes.
Check opening and closing by placing the thermostat
and a thermometer in heated water. The thermostat
should start to open at
175"
F
(70'
C)
and be full yopen
at
202'
F (94OC).
It
should close immediately when
removed from hot water. Replace the thermostat if
it
does not operate properly.
High
Water Temperature Cut-off Switch: This nor-
mally closed switch (Figure
24)
senses water
temperature in the engine cooling jacket. The switch
opens, breaking the circuit to the coil primary when
the water temperature reaches about
230"
F
(11
0"
C)
and closes when the temperature drops below 190'
F
(88'C).
TEMPERATURE
SWITCH
'
FIGURE
24.
HIGH
WATER TEMPERATURE SWITCH
35
Redistribution or publication of this document
by any means, is strictly prohibited.
Redistribution or publication of this document
by any means, is strictly prohibited.
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