TM 10-3930-671-24 STEP 17 Using the plug wrench, loosen and remove  the spring side advance piston hole plug (Figure 3.17a) FIGURE 3.17a. Remove    the    plug,    piston    and    slide    washer    (Figure (Figure 3.17b). FIGURE 3.17b. STEP  18  Loosen  and  remove  the  power  side  advance piston hole plug (Figure 3.18a). Remove the plug, piston, spring and slide washer (Figure 3.18b). FIGURE 3.18a. NOTE The  sides  of  the  housing,  just  above  the  advance boss,   bear   a   ’C’   or   ’CC’   marking   to   denote   pump rotation. The power side piston is located in the side of   the   housing   which   is   marked   with   the   letter indicating rotation. Disassemble    the    auto    advance    components    (Figure 3.18c).  Invert  spring  side  piston  hole  plug  and  let  the piston, spring and guide fall into your hand. FIGURE 3.18c. F-227