3-20. TM 9-2910-226-34 damage can be repaired with a used tap or die. Replace all threaded parts that are beyond repair. 3-19. Inspection of Overflow Valve Assembly. Inspect the overflow valve threads for damage and inspect valve for cracks. Replace the complete overflow valve assembly if damaged. Refer to figures 3-38, 3-39 and 3-40 for selection of replacement overflow valves. Both used and new valves will be functionally inspected at pump calibration and test as outlined in paragraph 3-58b. Figure 3-38. Overflow valve assembly (code A. B, C, D and E pumps). Figure 3-39. Overflow valve assembly (code F pump). Fuel Injection Pump Fuel Supply Pump Code A (2910 -178-1 115) 4320-908-6322 Code B (2910-908-6320) 4320-908-6321 Code C, D and E (2910-759-5410) 4320-908-6321 Code F (2910-017-9778) 4320-999-2276 Code G (early, late and rebuild, 2910-871-5428 or (2910-860-2333 or 2910-966-6317). 4320-908.6321. (3) Refer to figure 3-41 to distinguish the fuel supply pump identifying features. (a) Supply pump– 4320-908-6322 has relief valve in pump gear cover and relief valve housing is stamped 80 PSI. (b) Supply pump– 4320-908-6321 has a flat pump gear cover and check valve screw has ¼-NPT tapped hole. (c) Supply pump– 320-999-2276 has relief valve in pump gear cover and relief valve housing is stamped 60 PSI. (d) Supply pump–2910-871-5428 has a flat pump gear cover and check valve screw does not have tapped hole. Figure 3-40. Overflow valve assembly (code G pump). 3-30