Engines & Engine Parts. Car & Truck Parts & Accessorie. Oil Pump 3804535 3085379 3803698 For Cummins N14 NT855 NTA855 Diesel Engine. Engine Oil Pump Assembly. G855 N14 NH855 NT855 NTA855. For Cummins G855 N14 NH855 NT855 NTA855 Diesel Engine Parts. Please confirm according to the correct part number and not just the model number. Please leave your physical address (home or office address) but do not leave your P. Box address and ensure that your address and contact inforrmation are correct. Please make sure it will fit your machine before purchasing it. If you are not sure this is what you need please find out your engine model series number and contact our Customer-service. Communication is very, very important for us to do business online.