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How to Procedures
2. Remove the debris by blowing them through with compressed air or spraying
them out with water. Work from the rear of the radiator (in the opposite
direction of the normal cooling air flow).
3. Drain the coolant when the engine is cold. Refer to section "Cooling System
Drain Procedure". For detailed procedures, see the vehicle/chassis
maintenance manual. For types of coolant, refer to the How to Select Coolant
section for the listing of required intervals using the recommended coolants.
4. If the HVAC unit is connected to the cooling system, open the regulating
valves all the way.
Degreasing the Cooling System
Degrease as follows:
WARNING: HOT COOLANT
To avoid scalding from the expulsion of hot coolant, never
remove the cooling system pressure cap while the engine is at
operating temperature. Wear adequate protective clothing (face
shield, rubber gloves, apron, and boots). Remove the cap slowly
to relieve pressure.
1. Fill the cooling system with a 5% solution (1.6 ounces per quart [50 grams
per liter] of water) of a mildly alkaline cleaning agent, such as sodium
carbonate.
2. Run the engine at moderate speed until the thermostat starts to open, at an
operating temperature of approximately 60° C (140° F). Then run it for about
five minutes longer. Shut down the engine and allow it to cool to
approximately 50° C (112° F).
3. Drain all the cleaning solution.
4. Flush the cleaning solution from the cooling system.
a. Immediately after draining the cleaning solution, flush the system with
clean water.
b. Once the clean water has drained, fill the system again with clean
water.
c. Run the engine. Allow the engine to warm up to approximately 60° C
(140° F), and then run it about five minutes longer.
d. Drain the hot water.
5. Fill the cooling system with new coolant. For detailed procedures, see the
vehicle/chassis maintenance manual. For types of coolant, refer to the How
to Select Coolant section for the listing of required intervals using the
recommended coolants.
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Copyright © 2014 DETROIT DIESEL CORPORATION DDC-SVC-MAN-0175
All information subject to change without notice.
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