RING 3T5225 - Caterpillar

Note: These coolant change intervals are only achievable with annual S O S Services Level 2 coolant sampling and analysis.Distilled water or deionized water is recommended for use in engine cooling systems.If distilled water or deionized water is not available, use water that meets or exceeds the properties that are listed in 5.
Table 5
Caterpillar Minimum Acceptable Water Requirements    
Property    Maximum Limit    ASTM Test    
Chloride (Cl)    
40 mg/L (2.4 grains/US gal)     "D512", "D4327"    
Sulfate (SO4)    
100 mg/L (5.9 grains/US gal)     "D516"    
Total Hardness    
170 mg/L (10 grains/US gal)     "D1126"    
Total Solids    
340 mg/L (20 grain/US gal)     "Federal Method 2540B" (1)    
Acidity     pH of 5.5 to 9.0     "D1293"    
( 1 ) Total dissolved solids dried at 103 - 105?C, "Standard Method for the Examination of Water and Wastewater", American Public Health Association, et al, 1015 15th Street, N.W. Washington, DC 20005DO NOT use the following types of water in cooling systems: hard water, softened water that has been conditioned with salt and sea water.Glycol
Glycol in the coolant helps to provide protection against the following conditions:
Boiling
Freezing
Cavitation of the water pump and cylinder linersFor optimum performance, Caterpillar recommends a 1:1 mixture of a water/glycol solution.Note: Use a mixture that will provide protection against the lowest ambient temperature.Note: 100 percent pure glycol will freeze at a temperature of −23 °C (−9 °F).Most conventional heavy-duty coolants use ethylene glycol. Propylene glycol may also be used. In a 1:1 mixture with water, ethylene and propylene glycol provide similar protection against freezing and boiling.Refer to Tables 6 and 7 for additional information.
Table 6
Ethylene Glycol    
Concentration    Freeze Protection    Boil Protection (1)    
50 Percent    
−37 °C (−34 °F)    
106 °C (223 °F)    
60 Percent    
−52 °C (−62 °F)    
111 °C (232 °F)    
( 1 ) Protection from boiling is increased with the use of a pressurized radiator.
Do not use propylene glycol in concentrations that exceed 50 percent glycol because of propylene glycol's reduced heat transfer capability. Use ethylene glycol in conditions that require additional protection against boiling or freezing.
Table 7
Propylene Glycol    
Concentration    Freeze Protection    Boil Protection    
50 Percent    
−32 °C (−26 °F)    
106 °C (223 °F)    To check the concentration of glycol, use 245-5829 Coolant Test Kit . The testers give readings that are immediate and accurate. The testers can be used with ethylene or propylene glycol.Note: Propylene glycol coolant that is used in Caterpillar Diesel Engine cooling systems must meet "ASTM D6210-04 "Fully-Formulated Propylene Glycol-Based Engine Coolant for Heavy-Duty Engines" standards. When Propylene glycol is used in heavy-duty diesel engines, Supplemental Coolant Additive (SCA) must be added regularly for protection for the liner cavitation. Consult your Caterpillar dealer for more information.S O S Services Coolant Analysis
Testing the engine coolant is important to ensure that the engine is protected from internal cavitation and from corrosion. The analysis also tests the ability of