Section 5
Section 5
Cooling System
Cooling System
Introduction.
Introduction.
The cooling system cools the
The cooling system cools the
engin
engine.
e. Ref
Refer t
er to
o
Section 9A
Section 9A
for transmission
for transmission
cooling and
cooling and
Section 15C
Section 15C
for the wet disc brakes
for the wet disc brakes
cooling system to find more detailed cooling infor-
cooling system to find more detailed cooling infor-
mation on these particular systems.
mation on these particular systems.
Major Components
Major Components
(Illustration 5-5)
(Illustration 5-5)
..
The engine
The engine
cooling system consists of coolant, radiator /
cooling system consists of coolant, radiator /
charge air cooler, piping connecting the radiator to
charge air cooler, piping connecting the radiator to
the engine and a water pump to circulate the cool-
the engine and a water pump to circulate the cool-
ant.
ant. A coolant fil
A coolant filter
ter, remote mount
, remote mounted, is used to
ed, is used to
filter and condition the coolant.
filter and condition the coolant.
Operation
Operation
(Illustration 5-5)
(Illustration 5-5)
..
When the engine is
When the engine is
started, the water pump draws coolant from the
started, the water pump draws coolant from the
radiator int
radiator into the engine block.
o the engine block. The coolant is c
The coolant is cir-
ir-
culated through the engine and the coolant filter
culated through the engine and the coolant filter
until it reaches a temperature of approximately
until it reaches a temperature of approximately
180
180
_
_
F, at which point the thermostat will start to
F, at which point the thermostat will start to
open.
open. This wi
This will allow c
ll allow coolant flow bac
oolant flow back into the top
k into the top
of the radiator cor
of the radiator core.
e. Air trapped in the cool
Air trapped in the coolant will
ant will
travel to the top of the deairation space by means
travel to the top of the deairation space by means
of the deaeration line and an internal deaeration
of the deaeration line and an internal deaeration
stand tube.
stand tube. Coolant is
Coolant is made avail
made available from t
able from the
he
deaeration tank to displace the removed air by
deaeration tank to displace the removed air by
way of the make-up line.
way of the make-up line.
Coolant.
Coolant.
The cooling system of this equipment is
The cooling system of this equipment is
protected to -34
protected to -34
_
_
F (-36
F (-36
_
_
C) and 228
C) and 228
_
_
F (108.9
F (108.9
_
_
C).
C).
The solution is a 50 - 50 mixture of ethylene glycol
The solution is a 50 - 50 mixture of ethylene glycol
base antifreez
base antifreeze to water solut
e to water solution.
ion. Use soft wa
Use soft water
ter
in the coolant mi
in the coolant mixture.
xture. It is recom
It is recommended that
mended that
50% solution be maintained year round.
50% solution be maintained year round.
A
A proper
proper coolant
coolant / / SCA
SCA (Supplement
(Supplemental
al Coolant
Coolant
Additive)
Additive) additive
additive concentration
concentration must
must be
be main-
main-
tained to prevent liner pitting, corrosion and scale
tained to prevent liner pitting, corrosion and scale
deposits in the cool
deposits in the cooling system
ing system.
. Refer to the
Refer to the
Cummins QSM11 Engine Operation and Mainte-
Cummins QSM11 Engine Operation and Mainte-
nance Manual for coolant additive concentration.
nance Manual for coolant additive concentration.
The coolant additive concentration level may be
The coolant additive concentration level may be
tested with a coolant test kit, Taylor part number
tested with a coolant test kit, Taylor part number
1006-175.
1006-175.
CAUTION:
CAUTION:
Insufficient concentration of
Insufficient concentration of
the coolant additives will result in liner pitting
the coolant additives will result in liner pitting
and engine
and engine failur
failure.
e.
Coolant Filter
Coolant Filter
(Illustration 5-1)
(Illustration 5-1)
..
The coolant filter
The coolant filter
is used in the cooling system to control the water
is used in the cooling system to control the water
acidity, soften the water to reduce scale formation,
acidity, soften the water to reduce scale formation,
filter out suspended materials and add a corrosion
filter out suspended materials and add a corrosion
inhibiting chemical to the coolant which provides a
inhibiting chemical to the coolant which provides a
protective film on the water passages.
protective film on the water passages.
CAUTION:
CAUTION:
Coolant containing anti-leak
Coolant containing anti-leak
additives must not be used with the coolant
additives must not be used with the coolant
filter because it will clog the element.
filter because it will clog the element.
COOLANT
COOLANT
FILTER
FILTER
CUT-OFF
CUT-OFF
VALVES
VALVES
Illustr
Illustration 5-1.
ation 5-1. Coolant Fi
Coolant Filter
lter
Radiator / Charge Air Cooler
Radiator / Charge Air Cooler
(Illustration 5-4)
(Illustration 5-4)
..
The radiator is comprised of a deaeration tank,
The radiator is comprised of a deaeration tank,
core, and a charge air c
core, and a charge air cooler
ooler.
. The deaeration
The deaeration
tank functi
tank functions as a cool
ons as a coolant storage t
ant storage tank.
ank. When
When
adding coolant to the system, coolant should be
adding coolant to the system, coolant should be
added to the deaerati
added to the deaeration tank.
on tank. Access t
Access to the
o the
deaeration tank is supplied through a 7 psi radia-
deaeration tank is supplied through a 7 psi radia-
tor cap located on the left side of the radiator,
tor cap located on the left side of the radiator,
above the radiat
above the radiator sight gl
or sight glasses.
asses. The radiator
The radiator
coolant level is to be maintained by the coolant
coolant level is to be maintained by the coolant
sight glasses below the 7 psi radiator cap.
sight glasses below the 7 psi radiator cap.
The radiator is for
The radiator is force-air-
ce-air-cooled.
cooled. Access to the
Access to the
core is supplied through a 15 psi radiator cap
core is supplied through a 15 psi radiator cap
located on the right s
located on the right side of the radiator
ide of the radiator.
. When the
When the
cooling system has been completely drained, the
cooling system has been completely drained, the
15 psi radiator cap neck will allow a quicker, more
15 psi radiator cap neck will allow a quicker, more
efficient method of refilling the cooling system.
efficient method of refilling the cooling system.
Charge Air Cooler
Charge Air Cooler
(Illustration 5-4)
(Illustration 5-4)
..
The QSM11
The QSM11
engine is equipped with a trubocharger. The
engine is equipped with a trubocharger. The
turbocharger is driven by the exhaust from the
turbocharger is driven by the exhaust from the
engine. The exhaust turbine of the turbocharger is
engine. The exhaust turbine of the turbocharger is
coupled to the in
coupled to the intake turbi
take turbine.
ne. The exhaust t
The exhaust turbine
urbine
drives the intake turbine. The intake turbine com-
drives the intake turbine. The intake turbine com-
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