ENGINE MAINTENANCE - Engine Coolant Specifications degradation and could result in damage to the cooling system and engine components. Consult your dealer or the coolant manufacturer’s representative for recommended extended life coolant test kits, test strips, and laboratory sample procedures. and refill the system completely with one type of coolant. Build up in coolant low-flow areas Plug the radiator and oil cooler Damage the water pump seal Damage heat transfer surfaces Damage seals and hoses Corrode brass and copper 2 Cooling System Sealing Additives and Soluble Oils Coolant Extender OK Failure to comply may result in equip- ment or property damage.
Add extended life coolant extender, if necessary, according to the corrosion inhibitor concentration required. DO NOT add coolant extender to nitrite-free coolant. 1 Engine Coolant Specifications Checking Coolant Level 1. Do not use soluble oils or sealing additives. Check the coolant level daily. See Coolant Level on page 35 . Engine capacity, pressure, and temperature specifications. CAUTION CAUTION When adding coolant, avoid mixing dif- ferent brands and formulations. If the coolant is mixed with more than 25% of a different formulation (for example, mixing OAT and NOAT coolants), en- gine corrosion damage could occur.
If mixing exceeds 25% of total system volume, it is recommended to flush The use of sealing additives or soluble oils in the cooling system can cause damage to the engine. These additives can plug various areas of the radiator, EGR system and oil cooler. The plug- ging of the cooling system can hamper heat transfer, causing internal engine damage. DO NOT use sealing addi- tives or soluble oils in the cooling sys- tem. The use of sealing additives can: Engine Coolant Specifications for PACCAR PX-9 Coolant Capacity (engine only) 16.5 qt (15.6 liters) Standard modulating thermostat range 180-200°F (82-93°C) 50 Y53-1185-1E1 (04/16/18)