Perkins 904F-E28T Operation And Maintenance Manual page 57

M0125147
NOTICE
Incorrect or incomplete flushing of the cooling system
can result in damage to copper and other metal
components.
To avoid damage to the cooling system, make sure
that the cooling system is completely flushed with dis-
tilled or deionized water. Continue to flush the system
until all signs of the cleaning agent are gone.
Most commercial cooling system cleaning agents are
corrosive and their use is not recommended by Per-
kins. If these agents have to be used to remove
heavy deposits, then they should not be left in the
system any longer then recommended by the agent
manufacturer and engine temperature should not ex-
o
ceed 30 C. The system must be thoroughly flushed
with distilled or deionized water after use of these
cleaning agents.
7. Drain the cooling system into a suitable container
and flush the cooling system with distilled or
deionized water.
Note: The cooling system cleaner must be
thoroughly flushed from the cooling system. Cooling
system cleaner that is left in the system will
contaminate the coolant. The cleaner may also
corrode the cooling system.
8. Repeat Steps 6 and repeat steps 7 until the
system is completely clean.
9. Fill the cooling system with the Perkins Premixed
ELC.
ELC Cooling System Contamination
NOTICE
Mixing ELC with other products reduces the effective-
ness of the ELC and shortens the ELC service life.
Failure to follow these recommendations can result in
shortened cooling system component life.
Do not mix types and specifications of coolant.
Do not mix types and specifications of SCAs.
ELC cooling systems can withstand contamination to
a maximum of 10 percent of conventional heavy-duty
antifreeze or SCA. If the contamination exceeds 10
percent of the total system capacity, perform ONE of
the following procedures:
• Drain the cooling system into a suitable container.
Dispose of the coolant according to local
regulations. Flush the system with a 5 to 10
percent solution of Perkins ELC. Fill the system
with the Perkins ELC.
• Maintain the system as a conventional Heavy-
Duty Coolant. Treat the system with an SCA.
Change the coolant at the interval that is
recommended for the conventional Heavy-Duty
Coolant.
Commercial Heavy-Duty Antifreeze and
SCA
NOTICE
Commercial Heavy-Duty Coolant which contains
Amines as part of the corrosion protection system
must not be used.
NOTICE
Never operate an engine without water temperature
regulators in the cooling system. Water temperature
regulators help to maintain the engine coolant at the
correct operating temperature. Cooling system prob-
lems can develop without water
regulators.
Check the antifreeze (glycol concentration) to ensure
adequate protection against boiling or freezing.
Perkins recommends the use of a refractometer for
checking the glycol concentration. Do not use a
hydrometer.
NOTICE
Do not mix types and specifications of coolant.
Do not mix types and specifications of SCAs.
Do not mix SCAs and Extenders.
Only use SCAs or Extender approved by coolant
manufacturer and are compatible with coolant.
Perkins engine cooling systems should be tested at
250 hour intervals for the concentration of SCA.
Additions of SCA are based on the results of the test.
SCA that is liquid may be needed at 250 hour
intervals.
Adding the SCA to Heavy-Duty Coolant
at the Initial Fill
Use the equation that is in Table 9 to determine the
amount of SCA that is required when the cooling
system is initially filled.
Coolants that conform to "ASTM D4985" and do not
conform to "ASTM D6210" will require addition of
SCA at initial fill.
57
Maintenance Section
Fluid Recommendations
temperature