CYLINDER HEAD GP 1590305 - Caterpillar

Industrial, Marine And Generator Set Engines;
3512 (51Y) Vehicular EnginesSUPPLEMENT: 07/00/89ENGINE NEWS, MAY 1989, PAGE 6, "Check Valve Added To Fuel Injection Lines" on 3500 Industrial, Marine And Generator Set Engines; and 3512 (51Y) Vehicular Engines".This article DOES NOT apply to 3512 (51Y) Vehicular Engines.
--------------- END SUPPLEMENT ---------------Description of Change: A check valve has been added to the fuel injection lines groups on the above 3500 Engines. The check valve is designed to keep fuel from siphoning out of the fuel return line. This valve will help start-up by eliminating the air in the fuel system due to siphoning.Adaptable To: The check valve is effective with the engines in Chart A and is adaptable to all earlier engines. The new and former parts are shown in Chart B and the illustration.
Location of new parts in fuel injection lines groups.