VALVE G 3G8068 - Caterpillar

Never operate an engine without water temperature regulators in the cooling system. Water temperature regulators help to maintain the engine coolant at the proper operating temperature. Cooling system problems can develop without water temperature regulators. Removing the regulators allows some coolant to bypass the radiator, potentially causing overheating.Coolant Recommendations
Note: A Cat Diesel Engine equipped with air-to-air aftercooling (ATAAC) requires a minimum of 30 percent glycol to help prevent water pump cavitation.
Table 6
Coolant Recommendations for use in Cat Diesel Engines(1)(2)(3)
Type Product Service Hours Required Maintenance
Preferred Cat ELC (Cat Extended Life Coolant)
Cat ELI (Cat Extended Life Inhibitor) 966000 km (600000 miles) or 12000 SH or 6 years Add Cat ELC Extender at 483000 km (300000 miles) or 6000 SH or 3 years
Min requirements Cat EC-1 specification and "ASTM D6210" and
Organic Additive Technology (OAT) based on a combination of a monocarboxylic acid and a dicarboxylic acid
Phosphate, borate, and silicate free
Tolyltriazole: minimum typical concnetration of 900 ppm
Nitrite: minimum typical concentration of 500 ppm in new coolants 483000 km (300000 miles) or 6000 SH or 6 years Add Extender at 241000 km (150000 miles) or 3000 SH or 3 years
Acceptable Cat DEAC (Cat Diesel Engine Antifreeze/Coolant) 240000 km (150000 miles) or 3000 SH or 3 years SCA (Supplemental coolant additive) at the PM1 Interval
Min requirements for fully formulated Heavy Duty Commercial coolants "ASTM D6210" and
Nitrite (as NO2) concentration: Minimum of 1200 ppm (70 grains/US gal) and maximum of 2400 ppm (140 grains/US gal)
Silicon concentration: minimum of 100 ppm and maximum of 275 ppm 240000 km (150000 miles) or 3000 SH or 2 years
Min requirements for Commercial coolants requiring SCA precharge "ASTM D4985" and(1)
Nitrite (as NO2) concentration: Minimum of 1200 ppm (70 grains/US gal) and maximum of 2400 ppm (140 grains/US gal)
Silicon concentration: minimum of 100 ppm and maximum of 275 ppm 240000 km (150000 miles) or 3000 SH or 1 year SCA at initial fill and at the PM1 Interval
(1) New Coolants at 50 volume percent diluted. Coolants that are prediluted at the coolant manufacturer must be diluted with water that meets Reagent 4 "ASTM D1193" requirements.
(2) Maintain the in-service coolant at the given limits.
(3) When referring to the service hours, use the interval that occurs first. These coolant change intervals are only achievable with annual S O S Services Level 2 coolant sampling analysis.
Table 7
Special Requirements
Cat diesel engines equipped with air-to-air aftercooling (ATAAC) Minimum of 30% glycol is required. 50% Glycol is recommended. Water alone or water with SCA or with ELI is NOT allowed.
Use Only Approved SCAs and ExtendersConventional coolants require the maintenance addition of SCA throughout the expected life of the coolants. Do NOT use an SCA with a coolant unless approved specifically by the coolant supplier.