66
SEBU8603-01
Maintenance Section
Re
fi
ll Capacities
Commercial Heavy-Duty Antifreeze and
SCA
NOTICE
Commercial Heavy-Duty Coolant which contains
Amine 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 temperature regula-
tors.
Check the antifreeze (glycol concentration) in
order to ensure adequate protection against boiling
or freezing. Perkins recommends the use of a
refractometer for checking the glycol concentration.
A hydrometer should not be used.
Perkins engine cooling systems should be tested at
500 hour intervals for the concentration of SCA.
Additions of SCA are based on the results of the test.
An SCA that is liquid may be needed at 500 hour
intervals.
Adding the SCA to Heavy-Duty Coolant
at the Initial Fill
Use the equation that is in Table 12 to determine the
amount of SCA that is required when the cooling
system is initially
fi
lled.
Table 12
Equation For Adding The SCA To The Heavy-Duty
Coolant At The Initial Fill
V × 0.045 = X
V is the total volume of the cooling system.
X is the amount of SCA that is required.
Table 13 is an example for using the equation that
is in Table 12.
Table 13
Example Of The Equation For Adding The SCA To
The Heavy-Duty Coolant At The Initial Fill
Total Volume
of the Cooling
System (V)
Multiplication
Factor
Amount of
SCA that is
Required (X)
15 L (4 US gal)
× 0.045
0.7 L (24 oz)
Adding The SCA to The Heavy-Duty
Coolant For Maintenance
Heavy-duty antifreeze of all types REQUIRE periodic
additions of an SCA.
Test the antifreeze periodically for the concentration
of SCA. For the interval, refer to the Operation
and Maintenance Manual, “Maintenance Interval
Schedule” (Maintenance Section). Cooling System
Supplemental Coolant Additive (SCA) Test/Add.
Additions of SCA are based on the results of the
test. The size of the cooling system determines the
amount of SCA that is needed.
Use the equation that is in Table 14 to determine the
amount of SCA that is required, if necessary:
Table 14
Equation For Adding The SCA To The Heavy-Duty
Coolant For Maintenance
V × 0.014 = X
V is the total volume of the cooling system.
X is the amount of SCA that is required.
Table 15 is an example for using the equation that
is in Table 14.
Table 15
Example Of The Equation For Adding The SCA To
The Heavy-Duty Coolant For Maintenance
Total Volume
of the Cooling
System (V)
Multiplication
Factor
Amount of
SCA that is
Required (X)
15 L (4 US gal)
× 0.014
0.2 L (7 oz)
Cleaning the System of Heavy-Duty
Antifreeze
•
Clean the cooling system after used coolant is
drained or before the cooling system is
fi
lled with
new coolant.
•
Clean the cooling system whenever the coolant is
contaminated or whenever the coolant is foaming.