For additional information on selecting an oil, refer to
Special Publication, SEBU6251, “Caterpillar
Commercial Diesel Engine Fluids
Recommendations”.
Cooling System
To maintain the cooling system, the Total Cooling
System capacity must be known. The approximate
coolant capacity for the engine is shown in Table 13 .
External System capacities will vary among
applications. Refer to the specifications for the
External System capacity. This capacity information
will be needed in order to determine the amount of
coolant/antifreeze that is required for the Total
Cooling System.
Coolant Capacities
Table 13
3412C Generator Set Engine
Approximate Refill Capacities
Liters Quarts
Engine Only
58 62
Coolant Recommendations
NOTICE
Do not use a commercial coolant/antifreeze that only
meets the ASTM D3306 or D4656 specification. This
type of coolant/antifreeze is made for light duty auto-
motive applications.
The following coolants are the primary types of
coolants that are used in Caterpillar Engines:
Preferred – Cat ELC Extended Life Coolant or a
commercial extended life coolant that meets the
Caterpillar EC-1 specification
Acceptable – Cat DEAC Diesel Engine Antifreeze/
Coolant or a commercial heavy-duty coolant/
antifreeze that meets “ASTM D4985” or “ASTM
D5345” specifications
Caterpillar recommends a 1:1 mixture of water and
glycol. This mixture will provide optimum heavy-duty
performance as a coolant/antifreeze.
Note: Cat DEAC DOES NOT require a treatment with
an SCA at the initial fill. Commercial heavy-duty
coolant/antifreeze that meets “ASTM D4985” or
“ASTM D5345” specifications MAY require a
treatment with an SCA at the initial fill. Read the label
or the instructions that are provided by the OEM of
the product.
Table 14
Caterpillar Minimum Acceptable Water Requirements
Property
Maximum Limit ASTM Test
Chloride (Cl)
40 mg/L
(2.4 grains/US gal)
“D512”,
“D4327”
Sulfate (SO
4
)
100 mg/L
(5.9 grains/US gal)
“D516”
Total Hardness
170 mg/L
(10 grains/US gal)
“D1126”
Total Solids
340 mg/L
(20 grain/US gal)
“D1888”
Acidity pH of 5.5 to 9.0
“D1293”
In stationary engine applications that do not require
protection from boiling or freezing, a mixture of SCA
and water is acceptable. Caterpillar recommends a
minimum of six percent to a maximum of eight
percent SCA concentration in those cooling
systems. Distilled water or deionized water is
preferred. Water which has the required properties
may be used. For the water properties, refer to
Special Publication, SEBU6251, “Caterpillar
Commercial Diesel Engine Fluids
Recommendations” for additional information that
relates coolant.
Note: The service life of coolant is limited by use of
service hours. Refer to the specific engine's
Operation and Maintenance Manual, “Maintenance
Interval Schedule” (Maintenance Section). To
achieve this service life, the coolants must be
properly maintained. The maintenance program
includes S·O·S coolant analysis.
Table 15
Coolant Service Life
Coolant Type
Service Life
(1)
Cat ELC Six Years
Cat DEAC Three Years
Commercial Heavy-Duty Cool-
ant/Antifreeze that meets
“ASTM D5345”
Two Years
Commercial Heavy-Duty Cool-
ant/Antifreeze that meets
“ASTM D4985”
One Year
Caterpillar SCA and Water
Two Years
Commercial SCA and Water One Year
(continued)
SEBU7125-13
97
Maintenance Section
Refill Capacities and Recommendations
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