TM 10-3930-671-24 STEP 3 Install roller to roller dimension setting fixture in a  vise  (clamping  on  the  flat)  so  that  the  air  inlet  hole  is not covered by the vise. Assemble a 1.4" 18 N.PT. fitting to   the   air   inlet   of   the   fixture.   This   fitting   should   be adapted  to  a  supply  of  clean,  filtered,  compressed  air, regulated   to   a   pressure   between   40   and   100   p.s.i. Handle the  rotor  carefully,  holding  the  rollers  and  shoes in  their  slots.  Install  the  rotor  assembly  to  the  fixture  on the air inlet side. Using a micrometer, measure the roller- to-roller  dimension  (Figure  5.3)  (distance  between  the outer surfaces of the opposed cam rollers) and compare this   with   the   specification.   To   set   the   roller-to   roller dimension to the pump specification, turn the leaf spring adjusting    screw    inward    (clockwise)    to    increase    and outward  (counterclockwise)  to  reduce  the  roller  to-roller dimension. NOTE The   roller-to-roller   setting    provides    a    completely accurate maximum fuel adjustment and it should not differ from that shown in the applicable specification. FIGURE 5.3. A centrality check is now required. Refer to specifications page for allowable tolerances and check as follows: a.    After    setting    the    roller-to-roller    dimension    to    the amount  indicated  on  the  specification,  rotate  the  rotor until  one  roller  is  aligned  with  the  dial  indicator  plunger. Slide the indicator inward until the plunger depresses it at least  .010"  (.25mm).  Lock  the  indicator  retaining  screw. ’Zero"   the   indicator   on   high   point   of   roller   by   rotating knurled dial. b.   Rotate   rotor   (either   direction)   until   the   other   roller depresses the dial indicator plunger. c.  If  roller  centrality  is  beyond  specified  tolerance  (see injection pump specification), roller and/or shoes can be interchanged. Recheck centrality after each change  and be sure to recheck the roller-to-roller dimension. STEP   4   Rinse   the   hydraulic   head   assembly   in   clean calibrating   oil.   Remove   the   rotor   assembly   from   the fixture,   taking   care   that   the   shoes   and   rollers   do   not leave  their  respective  slots  and  rinse  in  oil.  Carefully, insert the rotor assembly into the hydraulic head (Figure 5.4). FIGURE 5.4. STEP  5  Place  the  cam  ring  onto  the  head  and  rotor assembly with directional arrow indicating the direction of rotation   of   the   pump   (Figure   5.5)   (Pump   rotation   is expressed as viewed from the drive end.). If the cam ring is  installed  incorrectly,  the  pump  will  not  be  in  time  with the engine. FIGURE 5.5. STEP 6 Place the weight retainer assembly on the rotor (Figure 5.6a). Make  sure  the  assembly  marks  on  the   rotor   and   the retainer line up with each other. Assemble the snap ring to its groove (Figure 5.6b). F-236