GENERAL COOLANT SPECIFICATIONS COOLANT SPECIFICATIONS GENERAL ANTIFREEZE Selection and maintenance of the engine coolant is In climates where the temperature is above -37 E C (- important to long engine life. The following information 34 E F), use a coolant mixture that contains 50 percent provides recommendations for selecting the engine antifreeze. Antifreeze is essential in any climate . It coolant and maintaining the coolant inhibitors. broadens the operating temperature range by lowering the coolant freezing point and by raising its boiling point.
Heavy duty diesel engines require a balanced coolant Do not use more than 50 percent antifreeze in the mixture of water, antifreeze, and supplemental coolant mixture unless additional freeze protection is required. additives. Supplemental coolant additive Never use more than 68 percent antifreeze under any recommendations are included in the section entitled condition. Inhibitors Conditioners. The coolant mixture must be drained and replaced at the specified service interval An antifreeze concentration greater than 68% will shown in the OPERATION & MAINTENANCE MANUAL, adversely affect freeze protection and heat transfer rates. or every two years of operation, whichever comes first.
Antifreeze concentrations between 68 and 100% actually have a higher freezing point than a 68% antifreeze WATER concentration and should not be used due to reduced Use water which has a low mineral content. Water used in conjunction with antifreeze, coolant filters and inhibited Low silicate ethylene glycol antifreeze is recommended. water must meet the following standards: The antifreeze should contain no more than 0.1% heat transfer rates. anhydrous alkali metasilicate. Low silicate antifreeze is Total Hardness - Not to exceed 170 parts per million recommended to avoid the formation of silica-gel (hydro- (10 grains/gallon maximum) to prevent scale gel).
This gel formation can occur when the cooling deposits. Water containing dissolved magnesium and system contains an over concentration of high silicate calcium (the usual reason for water hardness) above antifreeze and/or supplemental coolant additive. DO NOT the specified amount will cause scale deposits to use methanol or alcohol as an antifreeze because of its develop in the engine. low boiling point. Chlorides - Not to exceed 40 parts per million (2.5 Antifreeze may retain its freeze protection for more than grains/gallon maximum) to prevent corrosion.
one season but coolant conditioners must be added to Sulfites - Not to exceed 100 parts per million (5.8 grains/gallon maximum) to prevent corrosion. Antifreeze formulated with methoxy propanol, or maintain corrosion protection. propylene glycol, is not recommended for this system. Dissolved Solids - Not to exceed 340 parts per million (20 grains/gallon maximum) to minimize Do not mix types of antifreeze solutions. Mixed sludge deposits, scale deposits, corrosion or a solutions make it impossible to determine the combination of these. protection against freezing. Antifreeze containing sealer or anti-leak additives should NOT be used in this system.
If any of the above requirements cannot be met, use Sealer or anti-leak additives will cause plugging problems distilled, de-ionized, or de-mineralized water. To in the cooling system. determine if local water supplies meet these standards, water samples can be tested by water treatment Check the solution periodically and at normal operating laboratories. Softened water that is prepared using temperature, to be sure the cooling system has sufficient common salt (sodium chloride) contains excessive protection against freezing. amounts of chlorides and should not be used. Never use water alone in the cooling system antifreeze solution required for various temperatures.
because corrosion will occur. The following table shows the approximate percentage of 01-10