ENGINE AR-PRIMARY 2450993 - Caterpillar

Never operate an engine without water temperature regulators in the cooling system. Water temperature regulators help to maintain the engine coolant at the proper operating temperature. Cooling system problems can develop without water temperature regulators.
Check the coolant/antifreeze (glycol concentration) in order to ensure adequate protection against boiling or freezing. Caterpillar recommends the use of a refractometer for checking the glycol concentration. Use the 1U-7298 Coolant/Battery Tester (Celsius) or use the 1U-7297 Coolant/Battery Tester (Fahrenheit). The testers give readings that are immediate and accurate. The testers can be used with ethylene or with propylene glycol.Adding the SCA to Conventional Coolant/Antifreeze at the Initial Fill
Note: Caterpillar DEAC DOES NOT require an addition of SCA when the cooling system is initially filled.Commercial heavy-duty coolant/antifreeze that meets "ASTM D4985" or "ASTM D5345" specifications MAY require an addition of SCA when the cooling system is initially filled. Read the label or the instructions that are provided by the OEM of the product.The size of the cooling system determines the amount of SCA that is required. Use the equation that is in Table 1 to determine the amount of Caterpillar SCA that may be required when the cooling system is initially filled with heavy-duty coolant/antifreeze that meets "ASTM D4985" or "ASTM D5345" specifications.
Table 1
Equation For Adding The SCA At The Initial Fill
Coolant/Antifreeze That Meets "ASTM D4985" or "ASTM D5345" Specifications (1)
V × 0.045 = X
V is the total volume of the cooling system.
X is the amount of SCA that is required.
(1) Read the label or the instructions that are provided by the OEM of the product.Table 2 is an example for using the equation that is in Table 1.
Table 2
Example of the Equation For Adding The SCA At The Initial Fill
Coolant/Antifreeze That Meets "ASTM D4985" or "ASTM D5345" Specifications
Total Volume of the Cooling System (V) Factor for Multiplication Amount of SCA that is Required (X)
946 L
(250 US gal) × 0.045 43 L
(11 US gal) Adding the SCA to Conventional Coolant/Antifreeze For Maintenance
Heavy-duty coolant/antifreeze of all types REQUIRE periodic additions of an SCA.Test the coolant/antifreeze periodically for the concentration of SCA. For the interval, see the specific engine's Operation and Maintenance Manual, "Maintenance Interval Schedule" (Maintenance Section). SCA test kits are available from your Caterpillar dealer. Test the concentration of SCA or submit a coolant sample to your Caterpillar dealer. For more information on coolant analysis, see the Operation and Maintenance Manual, "S O S Coolant Analysis" topic (Maintenance Section).Additions of SCA are based on the results of the test or based on the results of the coolant analysis. The size of the cooling system determines the amount of SCA that is needed.Use the equation that is in Table 3 to determine the amount of Caterpillar SCA that is required.
Table 3
Equation For Adding The SCA To Conventional Coolant/Antifreeze 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 4 is an example for using the equation that is in Table