ISM, ISMe, and QSM11 – 008-021   Cooling System Precharge

Correct use of SCAs in conjunction with proper maintenance practices are needed to protect engines from cooling system problems. The system must be precharged with the correct number of units of SCA.

Cummins/Fleetguard® uses the SCA unit to define the required concentration level to protect against liner pitting.

New engines have a DCA4 coolant filter installed at the factory that will precharge the cooling system to the correct SCA concentration of approximately 1.5 units per gallon.

When coolant is replaced in the field, it must be replaced with fully formulated coolant or a 50/50 mixture of good-quality water and fully formulated antifreeze and the correct service coolant filter.

When coolant is replaced in the field, it must be replaced with fully formulated coolant or a 50/50 mixture of good-quality water and fully formulated antifreeze and the correct service coolant filter. Refer to Procedure 018-018 in Section V for correct requirements.