Operation and maintenance manual

76 SEBU8601-01
Maintenance Section
Refill Capacities
•
Maintain the sy
stem as a conventional Heavy-Duty
Coolant. Treat the system with an SCA. Change
the coolant at the interval that is recommended for
the conventio
nal Heavy-Duty Coolant.
Commercial Heavy-Duty Antifree ze 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
regulator
s in the cooling system. Water temperature
regulators help to maintain the engine coolant at the
correct operating temperature. Cooling system prob-
lems can d
evelop 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.
Ahydro
meter should not be used.
Perkins engine cooling systems should be tested at
500 hou
r 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.
Refer
to Table 13 for part numbers and for quantities
of SCA.
Table 13
Perkins Liquid SCA
Part Number
Quantity
21825735 10
Adding the SCA t o Heavy-Duty Coolant
at the Initial Fill
Commercial heavy-duty antifreeze that meets “ASTM
D4985” specifications MAY require an addition of
SCA at the initial fill. Read the label or the instructio ns
that are provided by the OEM of the product.
Use the equation that is in Table 14 to determine the
amount of Perkins SCA that is required when the
cooling system is initially filled.
Table 14
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 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 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). Test the
concentration of SCA.
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 16 to determine the
amount of Perkins SCA that is required, if necessary:
Table 16
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 17 is an example for using the equation that
is in Table 16.
Table 17
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)