Service Manual

ISB, ISBe and QSB (Common Rail [...] Cooling System
Section 8 - Cooling System - Group 08 Page 8-43
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Fill the engine with the correct coolant.
Use a mixture of 50-percent water and 50-percent
ethylene glycol or propylene glycol antifreeze to fill the
cooling system. Reference the Cummins® Coolant
Requirements and Maintenance, Bulletin 3666132.
Fill the engine until coolant is visible from the keel-cooled
thermostat housing.
Close the aftercooler and remote mounted heater
petcocks.
NOTE: The timing of this action will depend on the height
of the petcocks in the cooling system.
Continue to fill the system until the coolant expansion tank
is filled to the proper level and the low coolant level
sensor is covered.
Start the engine and monitor the coolant level and the low
coolant alarm until all air is purged from the cooling
system. Operate the engine for 5 minutes with the
pressure cap removed; do not exceed 50°C [122°F].
Check the coolant level again after the engine is
shutdown. Fill if needed.
Install the pressure cap.
Start the engine and monitor the low coolant alarm during
initial startup.
Flush
Automotive and Industrial
CAUTION
The system must be filled properly to prevent air
locks or serious engine damage can result. During
filling, air must be vented from the engine coolant
passages. Wait 2 to 3 minutes to allow air to be
vented; then add mixture to bring the level to the top.
To vent air during the fill process:
• Some thermostats have check balls that allow air to
vent through the thermostat when closed.
• An air vent port connection, which connects to the top
tank/coolant recovery tank of the cooling system, is
located next to the water outlet.
This provides adequate venting for a fill rate of 19 liters [5
gal] per minute.