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COOLING SYATEM
Advanced Engine Mechanic Development 1
COOLING SYSTEM
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COOLING SYATEM
Advanced Engine Mechanic Development 2
WATER PUMP THERMOSTAT( 12V140) (12V140)
SPEED = 1.8 x ENGINE RPM VALVE CRACKING TEMP: 76.5 +/- 2CFULL
OPENING TEMP: 90CFULL OPEN LIFT: 10 mm
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COOLING SYATEM
Advanced Engine Mechanic Development 3
RADIATOR
> Function> Radiator Fins> Radiator Cores> Radiation
process
> Upper Tank> Lower Tank> Baffle Plate.
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COOLING SYATEM
Advanced Engine Mechanic Development 4
PRESSURE VALVE
The pressure valve acts to seal the pressure inside the radiator
until thedifference in pressure from the atmospheric
pressure(Differential pressure acting on the pressure valve) is
0.75kglcm2 evenwhen the temperature of the cooling water rises.In
this way it prevents the cooling water from boiling or
overflowing.
Actuating pressure: 0,75kglcm2 (differential pressure)
VACUUM VALVE
If the internal pressure is sealed, it becomes more difficult
for bubblesto be generated from the finer or for bubbles to be
caused
by the churning of the water pump, so this actsto prevent
pitting or corrosion,If the set pressure of the pressure valve is
made higher,
the internal stress on components in the cooling systemwill
increase, so the set pressure must not be raised too high.
After the engine stops, and the temperature of the cooling water
drops,causing negative pressure inside the cooling system, the
pressure valveacts as a vacuum valve to remove the
internal stress and relieve the negative pressure.The radiator
cap plays an important role, so tell the user to replacethe cap
immediately with a new part if it is damaged or stolen.
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COOLING SYATEM
Advanced Engine Mechanic Development 5
COROSSION RESISTOR
CORROSION RESISTORCorrect use of the corrosion resistor will
lead to extensionof the machine life and reduction of owning &
Operation cost.Corrosion resistors are installed to Komatsu
engines,These corrosion resistors have an important role, as they
actto increase durability and extend the life of the engine,liner,
and oil cooler. In addition, they also act toprevent problems such
as pitting caused by cavitations.
Paper ElementThis acts to collect the dirt and particles of
scaleor rust in the coolant. In this way it actsto prevent them
from sticking to the coolantpassages, and protects the water pump
seal.
InhibitorThe solid white chemical dissolves in water andforms a
corrosion prevention film on the surface ofthe cylinder liner
block. It also makes it more difficult
for scale to stick to the cylinder liner. It dispersesthe scale
and suspends it in the water, anddischarges it together with the
cook ant. If thesechemicals dissolved in water are used for a long
time,or they become diluted because of addition of waterTo the
coolant, they gradually start to lose their effect.
