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d. Draining the Cooling System
To drain the cooling system, proceed as follows:
Check temperature gage; coolant temperature must be no higher than 120º F
(50º C) before removal of radiator cap.
(1)
Remove radiator cap.
(2)
Open the radiator drain valve.
(3)
Allow the system to drain completely.
NOTE:
Be sure the drain valve does not clog during draining.
(4)
When the system is completely drained, close the drain valve.
e. Cleaning the Cooling System
There may be need for cooling system internal cleaning. If chemical cleaning becomes necessary,
refer to instructions in the Cummins Operation and Maintenance Manual.
f. Cleaning the Radiator Core
Blow out accumulated dirt from the radiator core air passages, using compressed air. Engine
overheating is often caused by bent or clogged radiator fins. When straightening bent fins, be
careful not to injure the tubes or to break the bond between fins and tubes.
NOTE:
Direct the air in a reverse direction to normal air flow. Normal flow on this installation is from the
engine compartment outward.
g. Filling the Cooling System
(1)
Inspection/Check
a.
Check system for evidence of leaks.
b.
Inspect all hoses. Install new hoses as necessary. Tighten hose clamps as required.
c.
Check the condition of fan and water pump belts. Replace belts if necessary.
(2)
Install coolant
a.
Remove radiator cap. Be sure the drain valve is closed. Make sure the vent in the water
manifold is open to allow air to escape when filling.
b.
Pour coolant(anti-freeze/water) into radiator very slowly until it reaches level of top drain
valve. Close valve and continue filling until coolant reaches a level approximately 1 inch
below top of tank. Allow for a 5% expansion when coolant reaches operating temperature.
NOTE:
A safety feature built into the tank consists of a pipe attached to the filler neck which extends
into the tank approximately 1 inch. If coolant is added after the liquid reaches the bottom of the
safety tube, it will immediately overflow.
c.
Start the engine and allow to idle. Add coolant as trapped air escapes from the system and
the coolant level falls.
d.
Continue to check coolant level until all trapped air escapes. Add coolant, if needed, to fill to
the required level, 1 inch below top of tank. Install radiator cap and close the vent valve.
NOTE:
It is good practice to attach a card, indicating the cooling system contents and date serviced, to
the radiator filler neck.
h. Thermostat
The thermostat should be checked each fall, or as required. Refer to Cummins Operation and
Maintenance Manual for recommended test instructions.
WARNING
OM-2084 / Operation and Maintenance Manual
90CU24 / Series 500392 Generator Sets
Chapter 2-2
November 27/1997
Page 10
Содержание 90CU24
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