GEAR A 0005580 - Caterpillar

Coolant Additive (SCA) - SCA is a general term for an inhibitor package that is added to a cooling system. SCA is added for one of three reasons:
to precharge a new coolant that is not fully formulated
to provide corrosion protection in water/SCA cooling systems
to recharge an in service conventional coolant on a maintenance basis to maintain proper inhibitor levelsConventional coolants typically require SCA additions at approximately 250-300 service hours.The use of SCA (supplemental coolant additive) 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 Cat DEAC, adding more Cat SCA is not necessary. To ensure that the correct amount of Cat SCA is in the cooling system, test the concentration on a scheduled basis. Testing the concentration of nitrites and silicates through the S O S analysis is the best indicator of the amount of SCA 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, use with glycol-based coolants such as Cat DEAC
286-2578 nitrite level test strips, English, French, and Spanish instructions, use with glycol-based coolants such as Cat DEACFor the maintenance schedule, refer to the Operation and Maintenance Manual, "Maintenance Interval Schedule" (Maintenance Section) of the specific engine.Containers of Cat SCA are available in several sizes. Refer to this Special Publication, "Conventional Coolant/Antifreeze Cooling System Maintenance" article for available quantities and part numbers.