TUBE AS 3424462 - Caterpillar

(supplemental coolant additive) is a general term for an inhibitor package that is added to a cooling system. In glycol-based coolant applications, SCA is added to pre-charge a new coolant that is not fully formulated and/or to recharge an in-service conventional coolant on a maintenance basis to maintain proper inhibitor levels.Conventional coolants typically require SCA additions at approximately 250-300 service hours.The use of SCA helps to prevent the following conditions from occurring:
Corrosion
Formation of mineral deposits
Cavitation erosion of the cylinder liners
Foaming of the coolantCat DEAC (Diesel Engine Antifreeze/Coolant) is formulated with the correct level of Cat SCA. When the cooling system is initially filled with the recommended 1:1 or higher concentration of Cat DEAC and a recommended water, adding more Cat SCA is not necessary until the concentration of Cat SCA has been reduced to an unacceptable level. To ensure that the correct amount of Cat SCA is in the cooling system, the concentration of Cat SCA must be tested on a scheduled basis. Refer to the specific machine's Operation and Maintenance Manual, "Maintenance Interval Schedule" (Maintenance Section).Cat SCA maintenance elements and containers of Cat SCA are available in several sizes. Refer to the Table "Caterpillar SCA Requirements for Heavy-Duty Coolant/Antifreeze" and Table "Caterpillar Liquid SCA" in this Special Publication, "Conventional Coolant/Antifreeze Cooling System Maintenance" article for the part numbers.Note: Do not exceed a six percent maximum concentration of SCA. Maintain a three to six percent SCA concentration in the coolant.Maintain a concentration level of nitrites in the cooling system that is between 1200 ppm (70grains/US gal) and 2400 ppm (140 grains/US gal). S O S coolant analysis is the preferred method to check SCA concentration. Alternatively, nitrite levels can be tested with the following tools:
4C-9301 nitrite level test strips, English instructions only
286-2578 nitrite level test strips, English, French, and Spanish instructions
298-5311 nitrite level titration kit, subject to regional availability