Usage:
All 3408 Truck Engines
Description of Change: The method by which the fuel rack slots are hardened on 3408 Engines has been improved. This will give better wear resistance in the areas where the fuel rack comes in contact with the 4N1572 Cross Link. The basic dimensions for the fuel rack slot and cross link are shown in Illustration 1. The maximum total wear between the fuel rack slot and cross link ball head must not exceed 0.13 mm (.005 "). We recommend that you also install new 9S4160 Bearings when any new fuel rack is installed. Use the procedure in the Service Manuals for 3408 Engines. See Illustration 2.
Adaptable As: The 4N900 (right) and 4N901 (left) Fuel Racks are a direct replacement for the former fuel racks. The part numbers did not change. A different tooth pattern can be used for identification of the new and former fuel racks. See Illustration 3.
Illustration 1. Dimensions for 4N1572 Cross Link and fuel rack slot.
Illustration 2. Location of 9S4160 Bearings.
Illustration 3. New and former fuel rack tooth patterns.