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ARMY TM 9-2815-253-24 AIR FORCE TO 38G1-93-2 MARINE CORPS TM 2815-24/3 t. Mount a dial indicator.  Refer to FIGURE 3-10 to cylinder head to check intake valve drop.  Carefully turn engine a small amount either side of TDC and dial indicator can be zeroed at TDC. FIGURE 3-10.  Checking Piston Drop g. Measure piston drop.  Engine should then be rotated opposite normal crankshaft rotation (counterclockwise as viewed  from  fan  end)  to  approximately  0.01  in.    (0.2544  mm)  drop  beyond  specified  piston  drop  of  0.99  in. (2.519 mm).  Then rotate in direction of normal crankshaft rotation until specified piston drop is reached.  It is important that specified piston drop be approached in direction of normal crankshaft rotation. NOTE It  may  be  necessary  to  push  down  on  valve  stem  to  overcome  friction  of  stem  seal  and  maintain contact of valve head to piston crown. NOTE Ensure top face of crankcase is clean. h. Using a depth gage, measure distance (X) from top face of crankcase to top of fuel pump tappet cap.  Refer to FIGURE 3-11.  Subtract dimension (X) from dimension (B) 2.02 in.  (51.196 mm) to obtain required thickness of shim pack to be installed between fuel injection pump plate and crankcase. FIGURE 3-11.  Fuel Injection Pump Dimensions 3-24


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