TM  10-3930-638-24&P 4-3.   FUEL   SYSTEM   MAINTENANCE   (cont) b. Fuel Injection Pump (cont). w. Linkage STEP LOCATION ITEM ACTION REMARKS REASSEMBLY  (cont) Adjust linkage gap to 0.125-0.165 inch as follows: (cont) a. Loosen nut (50) and back out torque screw (52) b. Hold throttle shaft lever (36) in wide open position c. Using tool P/N 18914, measure clearance between rear of shutoff shaft (point B, illustration) and vertical tab (point A) on linkage hook (54) NOTE Adjustment is accomplished by changing the effective length of linkage hook (54) using linkage hook wrench tool P/N 13379. d. With linkage adjusting screw (point D) tight, apply a slight pressure to vertical tab (point A). At the same time, rotate pump one or two revolutions to ensure that linkage is in full forward position e. Loosen linkage adjusting screw (point D) and slide linkage to maximum  open  length f. Insert tool P/N 18914 between vertical tab (point A) and shutoff shaft (point B) and slide linkage hook together from rear until face of tab is flush against gauge g. Tighten linkage adjusting screw (point D) h. Check adjustment and reset if necessary 33 Housing, side a. Spacer (31) Position;  line up  holes  shown 4-125