826709 10 Mercruiser NUT, (.312-18) Stainless Steel

Table 1
Caterpillar® Lubricants Viscosity Grade
Cat Natural Gas Engine Oil Ultra 40Next Generation High-Performance NGEO NGEO Ultra 40 SAE 40
Cat Natural Gas Engine Oil Advanced 40Premium Performance NGEO NGEO Advanced 40 SAE 40
Cat Natural Gas Engine Oil EL350(1)
Premium Performance NGEO, Limited regional availability NGEO EL350 SAE 40
(1) Cat NGEO EL350 replaced Cat NGEO EL250Cat natural gas engine oils are the preferred oils for use in ALL Cat natural gas fueled engines that are covered by Special Publication, SEBU6400. Commercial alternative natural gas engine oils are, as a group, second choice oils.The proper SAE viscosity grade of oil is determined by the minimum ambient temperature during cold engine start-up. The proper SAE viscosity grade of oil is also determined by the maximum ambient temperature during engine operation. To determine the oil viscosity that is required for starting a cold soaked engine, refer to the minimum temperature in Table 2. To select the oil viscosity for operation at the highest anticipated ambient temperature, refer to the maximum temperature in the Table. Use the highest oil viscosity that is available to meet the required temperature during start-up.
Table 2
Cat NGEO SAE 40 Viscosity Grade Properties
Characteristic ASTM Test Ultra 40 Advanced 40 Cat EL350 Cat NGEO
Flash Point 0 ° C (32 ° F) "D0092" 247 252 247 252
Pour Point 0 ° C (32 ° F) "D0097" −21 −30 −21 —15
Viscosity (cSt) at 100 °C (212 °F) "D0445" 13 13 13.5 13.2
Viscosity Index "D2270" 95 min 103 97 98
Weight (Percent) of Sulfated Ash "D0874" 0.54 0.5 0.54 0.52
Total Base Number "D2896" 6 6 6.2 5.6 For additional information about oils for gas engines, see Special Publication, SEBU6400, "Caterpillar Gas Engine Lubricant, Fuel, and Coolant Recommendations".S O S Services Oil Analysis
Caterpillar recommends the S O S oil analysis program to monitor the condition of the oil. The analysis can help determine the maintenance requirements for the engine. The S O S program is part of the preventive maintenance program. For further information about the S O S program, see this Special Publication, "S O S Services Oil Analysis" topic.Coolant Recommendations
During shipping and storage, the engine must be protected from damage that can be caused by freezing of the cooling system. If the engine is shipped to a site with freezing temperatures and/or if the engine is stored in a location with freezing temperatures, the cooling system must contain antifreeze that will withstand the lowest ambient temperature. Frequently check the concentration of glycol in the coolant/antifreeze. Make sure that the concentration is adequate to prevent freezing. Otherwise, drain the cooling system.Coolant/antifreeze is normally composed of three elements: water, glycol, and additives. Each element must meet specific guidelines.Water
Never use water alone without Supplemental Coolant Additives (SCA) or without inhibited coolant. Water alone is corrosive at engine operating temperatures. Water alone does not provide adequate protection against boiling or freezing.
Deionized water or distilled water is recommended for use in engine cooling systems. If distilled water or deionized water is not available, use water with the properties that are listed in Table 3.
Table 3
Caterpillar Minimum Acceptable Water Requirements
Property Maximum Limit ASTM Test
Chloride (Cl) 40 mg/L (2.4 gr per US gal) "D512", "D4327"
Sulfate (SO4) 100 mg/L (5.9 gr per US gal) "D516"
Total Hardness 170 mg/L (10 gr per US gal) "D1126"
Total Solids 340 mg/L (20 gr per US gal) "D1888"
Acidity pH of 5.5 to 9.0 "D1293"
Use of water that does not meet the recommendations for the cooling system will damage the cooling system.Do not use these types of water in the cooling system: sea water, softened water that has been conditioned with salt, hard water and tap water.Only use water that meets the recommendations for the cooling system.
If you are not sure about the properties of your w