VALVE AS-SHUTOFF 2525806 - Caterpillar

To help prevent water pump cavitation, Caterpillar recommends a minimum of 30 percent of glycol in the coolant/antifreeze mixture.Use a mixture that will provide protection against the lowest ambient temperature.100 percent pure glycol will freeze at a temperature of −13 °C (9 °F).
Never use water alone without Supplemental Coolant Additives (SCA) or without inhibited coolant. Water alone is corrosive at engine operating temperatures. Water alone does not provide adequate protection against boiling or freezing.
Do not use water alone as an engine coolant. Supplemental Coolant Additive (SCA) helps to prevent the following conditions from occurring:
Corrosion
Formation of mineral deposits
Cavitation of the cylinder liner
Foaming of the coolantIf Caterpillar SCA is not used, select a commercial SCA. The commercial SCA must provide a minimum of 2400 mg/L or 2400 ppm (140 grains/US gal) of nitrites in the final coolant mixture.The quality of the water is a very important factor in this type of cooling system. Distilled water or deionized water is recommended for use in cooling systems. If distilled water or deionized water is not available, water that has the required properties may be used. For the water properties, see this Operation and Maintenance Manual, "General Coolant Information" topic (Maintenance Section).A cooling system that uses a mixture of only SCA and water requires more SCA than a cooling system that uses a mixture of glycol and water. The SCA and water requires six to eight percent of SCA.Adding the SCA to Water at the Initial Fill
The capacity 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 is required at the initial fill. This equation is for a mixture of only SCA and water.
Table 1
Equation For Adding The SCA To Water At The Initial Fill
V × 0.07 = X
V is the total volume of the cooling system.
X is the amount of SCA that is required. Table 2 is an example for using the equation that is in Table 1.
Table 2
Example Of The Equation For Adding The SCA To Water At The Initial Fill
Total Volume of the Cooling System (V) Factor for Multiplication Amount of SCA that is Required (X)
946 L
(250 US gal) × 0.07 66 L
(18 US gal) Adding the SCA to Water for Maintenance
Test the mixture of SCA and water periodically for the concentration of SCA. For the interval, see the specific engine's Operation and Maintenance Manual, "Maintenance Interval Schedule" (Maintenance Section).Test the concentration of SCA with the 8T-5296 Coolant Conditioner Test Kit or with S O S coolant analysis. For instructions, see this Operation and Maintenance Manual, "Cooling System Supplemental Cooling Additive (SCA)". For more information on coolant analysis, see this 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 capacity of the cooling system determines the amount of SCA that is required.Use the equation that is