SEAL 1607271 - Caterpillar

Coolant Information
Diesel engine operating temperatures have increased to improve engine efficiency. This means proper cooling system maintenance is especially important. Overheating, excessive cooling, pitting, cavitation erosion, cracked heads, piston seizures and plugged radiators are classic cooling system failures. In fact, coolant is as important as the quality of fuel and lubricating oil. It is important that this section be read carefully.
Caterpillar recommends that the coolant mixture contain a minimum of 30% Caterpillar Antifreeze, or equivalent. Liquid supplemental coolant additive must be added, when not using Caterpillar Antifreeze, which contains the proper additive.Never add coolant water to an overheated engine, engine damage can result. Allow the engine to cool first.All water is corrosive at engine operating temperature. The cooling system should be protected with a 3% to 6% concentration of liquid supplemental coolant additive at all times, regardless of the concentration of antifreeze.Excessive supplemental coolant additive greater than the recommended 6%, together with concentrations of antifreeze greater than 60% can cause deposits to form and can result in radiator tube blockage, overheating, and/or water pump seal damage.DO NOT use Dowtherm 209 Full-Fill coolant.If the engine is to be stored in, or shipped to, an area with freezing temperatures, the cooling system must be protected to the lowest expected outside (ambient) temperature.Refer to your OEM dealer for information on your cooling system arrangement.If special requirements are defined, the engine cooling system can be protected to -28°C (-20°F) with Caterpillar Antifreeze.
Check the specific gravity of the antifreeze solution frequently in cold weather to ensure adequate freeze protection.Clean the cooling system if it is contaminated, if the engine overheats, or if foaming is observed in the radiator.Coolant should be drained, the system cleaned and new coolant added Every Two Years or 290 000 km (180,000 miles), whichever comes first.When not using Caterpillar Antifreeze and supplemental coolant additive as recommended, the drain period must be shortened to Every One Year or 145 000 km (90,000 miles).After draining and refilling the cooling system, operate the engine with the cooling system vent cap removed until the coolant reaches normal operating temperature and the coolant level stabilizes. Add coolant mixture as necessary to fill the system to the proper level.Filling at over 38 liter (10 U.S. gallons) per minute can cause air pockets in the cooling system. Never operate without thermostats in the cooling system. The thermostats maintain the engine coolant at the proper operating temperature. Cooling system problems can arise without thermostats.Coolant Water
The minerals (calcium and magnesium) in hard water can combine with cooling system conditioner additives (silicates and phosphates) to drop out of solution and collect inside the radiator and on high temperature surfaces in the engine.The minerals (silicates, phosphates, calcium and magnesium) can also accumulate onto hot engine surfaces and reduce the effectiveness of the cooling system, especially after a number of heating and cooling cycles.Distilled water is less likely to have drop out (potential or severity) than hard or tap water. Tap water artificially softened with salt is not recommended for use