PLUNGER 1J8568 - Caterpillar

Every attempt is made to provide accurate, up-to-date information. By the use of this document, you agree that Caterpillar Inc. is not responsible for errors or omissions.
These recommendations are subject to change without prior notice. Contact your Caterpillar dealer for the most up to date recommendations.
Note: Instructions for the installation of the filter are printed on the side of each Cat spin-on filter. For filters that are not Cat filters, refer to the installation instructions that are provided by the supplier of the filter.Lubricant Recommendations
Due to significant variations in the quality and in the performance of commercially available oils, Caterpillar makes the following recommendations:
Cat Natural Gas Engine Oil (NGEO)
Cat EL250 Natural Gas Engine Oil (NGEO)
Cat EL350 Natural Gas Engine Oil (NGEO) The proper SAE viscosity grade of oil is determined by the minimum ambient temperature during cold engine start-up and 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 1. 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 in order to meet the required temperature during start-up.
Table 1
Engine Oil Viscosity    
Cat NGEO
Grade of Viscosity     Ambient Temperature    
Minimum Maximum    
SAE 30 (1)    
0 °C (32 °F)    
40 °C (104 °F)    
SAE 40 (1) (2)    
5 °C (41 °F)    
50 °C (122 °F)    
( 1 ) Cat NGEO is available in these grades only. Multigrade oils are NOT recommended for use in Cat Gas Engines. If other grades of viscosity are selected, ensure that the oil meets the requirements for Cat Gas Engines.
( 2 ) Currently unavailable in North AmericaFor further information about oils, see Special Publication, SEBU6400, "Caterpillar Gas Engine Lubricant, Fuel, and Coolant Recommendations".Fuel Recommendations
Cat gas engines will operate successfully in the range found in Special Instructions, REHS9280, "Air/Fuel Ratio Setup for Certain G3306B Engines". Contact your Cat dealer before using fuels such as wellhead gas, bio-gas, and manufactured gas. Coolant Recommendations
During shipping and storage, the engine must be protected from damage that can be caused by freezing of the cooling system. The cooling system must contain antifreeze that will withstand the lowest ambient temperature If the engine is shipped to a site with freezing temperatures and if the engine is stored in a location with freezing temperatures. Frequently check the concentration of glycol in the coolant/antifreeze. Make sure that the concentration is adequate in order to prevent freezing. If the coolant may be subject to freezing conditions, completely drain the cooling system.Coolant/antifreeze is normally composed of three elements: water, glycol and additives. Each element must meet specific guidelines.Water
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 2.
Table 2
Caterpillar Minimum Acceptable Water Requirements