LOUVER AS 3962351 - Caterpillar

Water alone and/or water mixed with SCA are not approved coolants for use with C7-C32 Heat Exchanger cooled marine engines. C7-C32 heat exchanger cooled marine engines require a minimum of 30 percent glycol to prevent cavitation of cooling system components, with a minimum of 50 percent glycol very strongly recommended. Use only glycol based coolants that meet one or more of the coolant specifications that are defined as preferred or acceptable in Special Publication, SEBU6251, "Caterpillar Commercial Diesel Engine Fluids Recommendations" and that also comply with any additional requirements that are stated in Special Publication, SEBU6251, "Caterpillar Commercial Diesel Engine Fluids Recommendations" (i.e. chemical composition, the use of SCA, the use of Extender, etc.).
The following coolant require a treatment of SCA at the initial fill:
Coolants which only meet the requirements of "ASTM D4985"The following coolant do not require a treatment of SCA at the initial fill:
Coolants which only meet the requirements of "ASTM D6210"
Cat DEACThe following coolant require treatment with SCA on a maintenance basis:
Cat DEAC
Coolants which only meet the requirements of "ASTM D4985"
Coolants which only meet the requirements of "ASTM D6210"
Table 4
Coolant Service Life
Coolant Type Service Life (1)(2)
Cat ELC 12000 Service Hours or Six Years(3)
Commercial coolant that meets the Caterpillar EC-1 Specification 6000 Service Hours or Six Years(4)(5)
Cat DEAC 3000 Service Hours or Three Years
Commercial Heavy-Duty Coolant/Antifreeze that meets "ASTM D6210" 3000 Service Hours or Two Years
Commercial Heavy-Duty Coolant/Antifreeze that meets "ASTM D4985" 3000 Service Hours or One Year
Cat SCA(6) and water(7) 3000 Service Hours or Two Years
Commercial supplemental coolant additive(8) and water(6)(7) 3000 Service Hours or One Year
(1) Use the interval that occurs first.
(2) Refer to the engine's Operation and Maintenance Manuals, "Maintenance Interval Schedule" for the correct interval for replacement of the cooling system water temperature regulator.
(3) Cat ELC Extender must be added at 6000 service hours or one half of the service life of the Cat ELC.
(4) An extender must be added at 3000 service hours or one half of the service life of the coolant.
(5) In order to be used in Cat diesel engines in accordance with the service interval for EC-1 coolants that is listed in this Special Publication, commercial EC-1 coolants must also pass/conform to the additional requirements for EC-1 specification coolants as stated in the coolant section of this Special Publication.
(6) The concentration of Cat SCA in a cooling system that uses Cat SCA and water should be from 6% to 8% by volume.
(7) Refer to this Special Publication, "General Coolant Information" under the section that discusses the requirements for water.
(8) Consult the supplier for the commercial SCA for instructions on usage. Also, refer to this Special Publication, "Water/Supplemental Coolant Additive" topic for additional information.Note: These coolant change intervals are only achievable with annual S O S Services Level 2 coolant sampling and analysis.Cat ELC can be recycled into conventional coolants.Cat S O S Coolant Analysis
Testing the engine coolant is important to ensure that the engine is protected from internal cavitation and corrosion. The analysis also tests the ability of the coolant to protect the engine from