Cooling system
Scania U.S.A. Inc. Tier4F
Coolant
Ethylene Glycol based coolant must be used in Scania Engines.
It must be Nitrite Free.
Engine coolant must contain a minimum of 35% and a maximum
of 60% anti freeze when there is a risk of freezing.
Only pour premixed coolant into the cooling system.
Examples of approved Scania antifreeze: ASTM D3306 and 4985
Antifreeze should never be mixed with a rust inhibitor.
Scania U.S.A. Inc. Tier4F
Filling and draining the cooling system
Adapter 99301 for
filling or draining coolant
Scania U.S.A. Inc. Tier4F
Coolant Flow
Closed
Open Thermostat
Scania U.S.A. Inc. Tier4F
Coolant Flow
VGT Coolant Out
VGT Actuator Coolant Out
Scania U.S.A. Inc. Tier4F
Coolant Flow
VGT Coolant In
VGT Actuator Coolant In
Scania U.S.A. Inc. Tier4F
Coolant Flow
EGR Cooler In
EGR Cooler Out
Scania U.S.A. Inc. Tier4F
Coolant pump
Scania U.S.A. Inc. Tier4F
Coolant Flow
Scania U.S.A. Inc. Tier4F
Thermostat
Dual thermostat
Opening temperature:
First one: 176 °F (80°C)
Second one: 188 °F (87°C)
Completely open: 215 °F (102°C)
Scania U.S.A. Inc. Tier4F
11
Heat RejectionTier 4F
DC 09 approx +20% increased heat to coolant
DC 13/16 approx +25% increased heat to coolant
This is at rated speed 2100rpm.
Cooling capacity will not decrease as much at lower power output,
since the EGR rate will increse. Approx 70% of max power will still
demand approx 90% of max heat rejection to cooling water
10% increased air flow and cooling requirement for CAC
Increased max coolant temp from 105°C (221°F) to 114°C (237°F)
12
Heat Rejection to cooling water
Example DC09 232kW Tier4I/Tier4F
kW
140
Tier 4F
120
40% 20-25%
100
Increase Increase
Tier 4i
80
60
40
20
0
1000 1100 1200 1300 1400 1500 1800 2100 rpm
Draining Coolant
Remove expansion tank cap.
Drain the coolant at two locations:
Lowest point of the cylinder block
Lowest point of the cooling system
Close the taps.
Scania U.S.A. Inc. Tier4F
Coolant Fill
Connect tool 99 301 to drain valve
Make sure that the cooling system bleed
pipes are not blocked or damaged
Open the expansion tank cap
Fill with coolant to the maximum level of
the expansion tank.
Disconnect hose
Set heating control to maximum heat
and start the engine. Idle speed must
not exceed 600 rpm. Leave the engine
idling for 15 min.
Stop the engine and top off coolant to
the maximum level in the expansion
tank.
Scania U.S.A. Inc. Tier4F
Cleaning Cooling System 6,000 hours
Run the engine until it has reached operating temperature and
drain the coolant.
Remove the thermostats.
Fill cooling system with clean hot water mixed with liquid
dishwasher detergent, concentration 1%.
Run the engine until it has reached operating temperature
approximately 20- 30 minutes.
Drain cooling system.
Refill system with clean hot water and run the engine for 20-30
minutes.
Drain water from system.
Install thermostats.
Fill the system with new coolant following the specification
under Coolants in the workshop manual.
Scania U.S.A. Inc. Tier4F
Checking Coolant 2,000 hours
Check Freeze point using a refractometer or coolant test strip.
Refractometer
Scania # 588805
Scania U.S.A. Inc. Tier4F
Electrically controlled fan
If there is no voltage across the If there is voltage across the
solenoid valve, the control valve solenoid valve, the control
is open. valve is closed.
Scania U.S.A. Inc. Tier4F
Rpm sensor for the fan
Scania U.S.A. Inc. Tier4F
Checking Drive Belt 1,000 hours
Check belt for cracks
Repair any problems found
Scania U.S.A. Inc. Tier4F
