TM 9-6115-604-34 NAVFAC P-8-633-34 1. FRONT PANEL 13. COOLER SOLENOID 2. DIAL INDICATOR 14. MAIN FUEL FILTER 3. ELECTRICAL CHASSIS 15. FUEL SIGHT GAGE 4. CONTROL PANEL 16. ANTI-VIBRATION RUBBER PADS 5. MAIN ELECTRICAL SUPPLY 17. FUEL PUMP MOTOR 6. CAMSHAFT DRIVE MOTOR 18. STORAGE BOX (ADAPTERS AND LINKS) 7. CAM BOX 19. INJECTOR CLAMPING CYLINDER 8. TOP TRAY 20. CLAMPING CONTROL HANDLE 9. STORAGE BOX 21. FUELARM 10. FUEL TANK 22. DEADWEIGHT VALVES 11. FUEL TANK HEATER 23. GUARD 12. COOLER CONNECTIONS Figure 6-20.  Injector Test Stand (Sheet 2 of 2) 6-15.  FUEL INJECTOR CLEANING, INSPECTION, AND REPAIR. a. Clean all parts ultrasonically to remove all traces of gum, varnish, and carbon. b. Check  the  ball  ends  of  the  injector  plunger  links  (2,  Figure  6-21)  for  wear  in  accordance  with  Figure  6-22. Replace the plunger links that show any signs of wear. c. Injector Plunger and barrel Inspection. (1) General.   Usually, seizure will be the only true indication of scuffing or scoring.  As a result of rocker lever thrust, bright spots or streaks may appear at the top of the plunger (3, Figure 6-21), and on the opposite side at the bottom of the plunger.   Provided  seizure  or  scoring  is  not  evident,  these  spots  are  normal  and the plunger should be reused.  Narrow streaks running from the top to the bottom of the plunger are usually caused by thickness variations in the penetrant treatment used to prevent corrosion.  Again, unless seizure or scoring is evident, reuse the plunger. (2) Check the plunger (3) surface for signs of seizure, scoring, and wear ridges.  The surface should show no signs of wear or scoring. (3) Check the plunger (3) spring seat for wear or cracks.  The spring seat should show no cracks or signs of wear. (4) Inspect the bore of the barrel (15) using a four power magnifying glass.  The bore should show no signs of wear or scoring. (5) Using a four power magnifying glass, inspect the check ball seat in the barrel (15) for burrs and wear. The seat should show no signs of burrs or wear. (6) See Figure 6-23.  Install a check ball (1) in the barrel (2), and check the depth of the check ball seat by measuring A.  Measurement of A must be 0.030 to 0.055 inch (0.76 to 1.40 mm).  Replace the check ball (1) or the barrel (2), or both, as necessary to achieve the required depth. (7) Replace both the plunger (3, Figure 6-21) and barrel (15) as a matched set for any defects found in steps (2) through (5), above. d. Cup inspection. (1) Inspect the cup (16, Figure 6-21) tip and spray holes with a four power magnifying glass.  There should be no signs of abrasive wear, corrosion, or enlarged or elongated spray holes.Replace the cup if it is defective. (2) Check the cup (16) spray pattern using injector cup spray tester 3376350 (Figure 6-19).  Replace cups that have irregular spray patterns. e. Using spring tester MIL-T-43560, check the load required to compress the spring (4, Figure 6-21) to a length of 2.40 inches (61.0 mm).  Replace the spring if the required load is less than 129.00 pounds (58.51 kg), or more than 149.75 pounds (67.93 kg). f. Inspect the injector retainer (12) for nicks or burrs which could prevent proper seating with the sealing ring (1). 6-44