PUMP & MTG GP-PISTON 3690419 - Caterpillar

Family Of EnginesReference: Service Magazine; August 28, 1989; Page 8; "New Fuel Injectors Available For Parts Service" for 3500 Family Of Engines.Reference: Service Magazine; October 2, 1989; Page 10; "Fuel Injector Reference For 3500 Family Of Engines" for 3500 Family Of Engines; D11N, 776B Tractors; 777B, 785, 789 Trucks.Reference: Service Magazine; Special Edition; November 1, 1989; Page 60; "Fuel Injector Reference For 3500 Family Of Engines" for 3500 Family Of Engines; D11N, 776B Tractors; 777B, 785, 789 Trucks.The "NOTE" on Page 12 of the October 2, 1989, and on Page 62 of the November 1, 1989 Service Magazine states: "Injectors which have either different tip orifice diameters or a different plunger design will have different fuel delivery characteristics. Injectors that vary in these characteristics CAN NOT be used as a mixed set in an engine."
This note has some exceptions to it as detailed in the August 28, 1989 Service Magazine. Refer to the chart in that article to see which injectors are interchangeable in mixed sets. Also, the current injector for all 3500 Vehicular Engines which had used the 9Y1785 Injector, is the 7E3382 Injector. To determine the applicable injector for earlier 3500 Vehicular Engines, check the charts in the October 2, 1989 Service Magazine.