5040009 EVINRUDE O-Ring 2.4-9.5

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 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. Dowtherm 209 Full-Fill coolant is not compatible with other antifreeze and coolant mixtures.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.
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 4,000 Service Hours (or to agree with the mileage/fuel consumption interval listed in the Maintenance Schedule, Cooling System-Flush and Fill). This interval is based on a 10 gal (38 L) OEM radiator capacity.After draining and refilling the cooling system, operate the engine with the radiator filler 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 5 U.S. gal (20 L) per minute can cause air pockets in the cooling system.Never operate without a thermostat in the cooling system. Cooling system problems can arise without a thermostat.Refer to Know Your Cooling System, SEBD0518 and Coolant and Your Engine, SEBD0970 for more detailed specifications.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.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 recommended because of less mineral drop out than hard or tap water. Tap water, artificially softened with salt, is not recommended for use in your engine's cooling system. Use water that meets the minimum acceptable water requirement to prevent drop-out of these chemical compounds.To determine your water characteristics, contact the local water department, agricultural agent or an independent laboratory to perform the testing service.Antifreeze
Caterpillar recommends that the coolant mix contain a minimum of 30% Caterpillar Antifreeze, or equivalent and acceptable water to maintain an adequate water pump cavitation temperature for efficient water pump performance.Premix coolant solution to provide protection to the lowest expected outside (ambient) temperature. Pure undiluted antifreeze will freeze at -10°F (-23°C).Only use a greater concentration (above 30%) of Caterpillar Antifreeze as needed for anticipated outside (ambient) temperatures. Do not exceed a coolant mixture of 60% antifreeze to water since a concentration above 60% antifreeze will reduce the engine's freeze protection and increase the possibility of deposit formation in the cooling system.
Use Caterpillar Antifreeze or ASTM D4985-89 (GM Specification 6038-M) Antifreeze. Caterpillar Antifreeze is available through your Caterpillar dealer in quantities that follow. Most commercial antifreezes are formulated for gasoline engine applications and will, therefore, have high silicate content. Caterpillar Antifreeze is formulated with a low silicate content and the proper coolant additives for heavy duty diesel engines.ASTM D4985-89 (GM Specification 6038-M) is a low silicate antifreeze, but supplemental coolant additive must be added. Make proper antifreeze additions.Adding pure antifreeze as a makeup solution for cooling system top-off is an unacceptable practice. It increases the concentration of antifreeze in the cooling system which increases the concentration of dissolved solids and undissolved chemical inhibitors in the cooling system. Add antifreeze mixed with acceptable water to the same freeze protection as your cooling system. Use the chart below to assist in determining the concentration of antifreeze to use. Check the coolant solution frequently in cold weather for glycol concentration with the 5P0957 or 5P3514 Coolant Tester to ensure adequate protection. Both testers are identical except temperature scale. They give immediate, accurate readings and can be used for antifreeze/coolants that contain ethylene or propylene glycol. Both are available at your Caterpillar dealer.If propylene glycol based antifreeze is used, DO NOT allow concentration greater than a 50/50 antifreeze to water mixture. The measurement of freeze protection must be made with a refractive-type tester (5P0957 or 5P3514) rather than a hydrometer-type, which can be used to test ethylene glycol based antifreeze.Supplemental Coolant Additive
Supplemental coolant additive is necessary to prevent rust, scale, pitting and/or corrosion of engine parts that coolant comes in contact with. Most antifreeze solutions DO NOT contain sufficient supplemental coolant additive. If other than Caterpillar products are used as the supplemental coolant additive, follow the manufacturers' recommendation for cooling system treatment and test evaluation.DO NOT mix Caterpillar Supplemental Coolant Additive or supplemental coolant additive elements with the other products available; select a cooling system treatment and use it exclusively. Liquid supplemental coolant additive can be purchased from your Caterpillar dealer. Follow the instructions on the container.
Always add supplemental coolant additive or equivalent to the coolant, or install a Caterpillar supplemental coolant additive element (if equipped). Never use coolant only. Supplemental coolant additive is required when not using Caterpillar Antifreeze for premixed coolant solution.Use supplemental coolant additive or a supplemental coolant additive element (if equipped) to maintain a 3% to 6% concentration in the cooling system to help prevent corrosion.To prevent over-inhibiting the engine's cooling system, never use both the liquid supplemental coolant additive and the supplemental coolant additive element (if equipped) at the same time. The use of these additives together could result in excessive