ARMY TM 9-2815-253-24 AIR FORCE TO 38G1-93-2 MARINE CORPS TM 2815-24/3 d. Tighten nut (5) to 25 ft-lbs (33.9 Nm). e. Repeat above steps a thru d, for remaining pushrods and rocker levers. f. Wait for up to 90 seconds on a new tappet or up to 45 minutes on a used engine for the hydraulic tappet to bleed down. CAUTION Do  not  force  crankshaft  to  rotate  if  rotation  is  not  free  easy  movement.    This  will  prevent  engine damage If a piston comes In contact with valve. NOTE Check  for  bleed  down  by  rotating  pushrods.    If  a  pushrod  rotates  after  the  respective  valve  has dosed, that hydraulic tappet has bled down. g. Manually turn the crankshaft very slowly, checking that all pushrods will rotate after their respective valve has closed. 3-27.  CYLINDER HEAD ASSEMBLY. 3-27.1.  Removal. a. Remove intake manifold.  Refer to paragraph 3-6.1. b. Remove exhaust manifold.  Refer to paragraph 3-7.1. NOTE Cap all fuel line connections that have been opened to prevent contamination of fuel system. c. Remove fuel injector pipes.  Refer to paragraph 3-18.1. d. Remove fuel injectors.  Refer to paragraph 3-17.1. e. Remove four nuts (1, FIGURE 3-28) securing lifting eyes (2); remove lifting eyes (2). f. Remove cylinder covers.  Refer to paragraph 3-25.1. g. Remove rocker levers and pushrods.  Refer to paragraph 3-26.1. NOTE There are three types of cylinder head bolts used.  Note location of these for proper location during installation. h. Remove four bolts (3), four bolts (4), and eight washers (5).  Refer to FIGURE 3-27 and remove eight bolts (7) and spacers (8). NOTE Check old gasket for number of identification holes; (i.e., one, two or three) This will aid installation. i. Lift off cylinder head (6, FIGURE 3-28) and gasket (7).  Discard gasket. 3-49