SLIP JOINT GP 2594834 - Caterpillar

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 Anti-Boil Protection
50 Percent −29 °C (−20 °F) 106 °C (223 °F) To check the concentration of glycol, use the 1U-7298 Coolant/Battery Tester (Degrees Celsius) or use the 1U-7297 Coolant/Battery Tester (Degrees Fahrenheit). The testers give readings that are immediate and accurate. The testers can be used with ethylene or propylene glycol.Coolant Recommendations
Do not use a commercial coolant/antifreeze that only meets the ASTM D3306 specification. This type of coolant/antifreeze is made for light duty automotive applications.
The following two coolants are used in Caterpillar diesel engines:Preferred - Caterpillar Extended Life Coolant (ELC) or a commercial extended life coolant that meets the Caterpillar EC-1 specificationAcceptable - Caterpillar Diesel Engine Antifreeze (DEAC) or a commercial heavy-duty antifreeze that meets "ASTM D4985", or "ASTM D6210" specificationsCaterpillar recommends a 1:1 mixture of water and glycol. This mixture of water and glycol will provide optimum heavy-duty performance as a antifreeze.Note: Caterpillar DEAC does not require a treatment with an SCA at the initial fill. A commercial heavy-duty antifreeze that meets "ASTM D4985" or "ASTM D6210" specifications MAY require a treatment with an SCA at the initial fill. These coolants WILL require a treatment with an SCA on a maintenance basis.Refer to Special Publication, SEBU6251, "Caterpillar Commercial Diesel Engine Fluids Recommendations" for additional information that relates to coolant.S O S Coolant Analysis
Table 8
Recommended Interval
Type of Coolant Level 1 Level 2
DEAC Every 250 Hours Yearly(1)
ELC Not Required Yearly
(1) The Level 2 Coolant Analysis should be performed sooner if a problem is identified by a Level 1 Coolant Analysis.S O S Coolant Analysis (Level 1)A coolant analysis (Level 1) is a test of the properties of the coolant.The following properties of the coolant are tested:
Glycol concentration for freeze protection and boil protection
Ability to protect from erosion and corrosion
pH
Conductivity
Visual analysis
Odor analysisThe results are reported, and appropriate recommendations are made.Refer to the Maintenance Interval Schedule in this Operation and Maintenance Manual, "Cooling System Coolant Sample (Level 1) - Obtain" for a sampling location and the maintenance interval for collecting the coolant samples.S O S Coolant Analysis (Level 2)A coolant analysis (Level 2) is a comprehensive chemical evaluation of the coolant. This analysis is also a check of the overall condition of the inside of the cooling system.The S O S Coolant Analysis has the following features:
Full coolant analysis (Level 1)
Identification of the source of metal corrosion and of contaminants
Water hardness
Identification of buildup of the impurities that cause corrosion
Identification of buildup of the impurities that cause scalingThe results are reported, and appropriate recommendations are made.Refer to the Maintenance Interval Schedule in this Operation and Maintenance Manual, "Cooling System Coolant Sample (Level 2) - Obtain" for a sampling location and the maintenance interval for collecting the coolant samples.Testing the engine coolant is important to ensure that the engine is protected