NOTE The spring pressure from the solenoid keeps all rack bar stop pins against their injector bases in a “fuel-off” position if nothing is hanging up or binding. Double zero must be set with the rack bar stop pin of No. 1 injector against injector base (“fuel-off” position). 6. Set double zero on horizontal dial indicator. a. Loosen red thumb screw on side of holding fixture and slide horizontal dial indicator laterally until small needle lines up on zero. Tighten red thumb screw. b. Loosen bezel screw on horizontal dial indicator and turn bezel until large needle lines up on zero. Tighten bezel screw. NOTE Ensure clamping screw is not protruding from threaded hole on hook end of control linkage positioning tool. Any protrusion will result in improper installation of control linkage positioning tool. 7. Turn clamping screw on control linkage positioning tool until end of clamping screw is inside of threaded hole. 8. Turn limit screw on control linkage positioning tool until nylon spacer is seated against control linkage positioning tool. 9. Position control linkage positioning tool on control linkage shaft (2) between No. 4 (1) and No. 5 (3) rocker arm supports. CAUTION Once installed, the control linkage positioning tool must not be removed, loosened, or allowed to slip on the control linkage shaft during the synchronization process. If the control linkage positioning tool does not stay clamped in this position, the synchronization process must be restarted. NOTE Ensure limit screw seats against cylinder head while tightening clamping screw. 10. Install control linkage positioning tool on control linkage shaft (2) by pressing down on limit screw while tightening clamping screw until it grips control linkage shaft (2) securely. NOTE Rotating control linkage shaft toward push rod side of engine will move all rack bars toward the “fuel-off” position and help free any rack bars which may be hanging up or binding. Ensure control linkage positioning tool moves freely and does not touch rocker arm supports. If the control linkage positioning tool does not stay clamped in position, the synchronization process must be restarted. Ensure limit screw seats against cylinder head when control linkage positioning tool is released. 11. Move control linkage positioning tool toward push rod side of engine to rotate control linkage shaft (2), then release. 12. Double check double zero on horizontal dial indicator. a. If large needle on horizontal dial indicator does not move when control linkage positioning tool is moved, then rack bar is in position and double zero is accurate. b. If large needle on horizontal dial indicator does move when control linkage positioning tool is moved, pull and release control linkage positioning tool several times until large indicator needle becomes stable and rack bar no longer hangs up. Repeat steps 6, 11, and 12 to reset double zero. 0321 00-4 TM 9-2320-386-24-1-2 0321 00 FUEL INJECTOR SYNCHRONIZATION MAINTENANCE (Contd)