Quantcast SECTION X.  ENGINE SUBASSEMBLY MAINTENANCE - TM-9-2815-253-24_64

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ARMY TM 9-2815-253-24 AIR FORCE TO 38G1-93-2 MARINE CORPS TM 2815-24/3 SECTION X.  ENGINE SUBASSEMBLY MAINTENANCE 3-25.  CYLINDER COVER. 3-25.1.   Removal.  Remove two nuts (1, FIGURE 3-27) and performed packings (2) securing each valve cover (3) to cylinder head; remove cover (3) and gasket (4).  Discard gasket (4) and performed packings (2). 3-25.2.  Inspection. a. Inspect cover for cracks, dents, or any other damage. b. Inspect nuts for rounded hex comers or thread damage. 3-25.3.  Installation. a. Remove any traces of old gasket from cylinder head and valve covers (3, FIGURE 3-27) mating surfaces. b. Ensure mating surfaces are clean and dry. c. Position  each  valve  cover  (3)  with  new  gasket  (4)  on  cylinder  head  and  secure  with  two  nuts  (1)  and  new preformed packings (2).  Tighten nuts (1) to 78 in-lbs (8.8 Nm). 3-26.  ROCKER LEVER. 3-26.1.  Removal. a. Remove cylinder covers.  Refer to paragraph 3-25.1. b. Remove nut (5, FIGURE 3-27) securing rocker lever (6) to cylinder head bolt (7); remove rocker lever. c. Remove pushrod (9). d. Repeat steps b and c for remaining rocker levers and pushrods. e. Do not remove cylinder head bolt (7) and spacer (8) unless damaged or cylinder head is being removed. 3-26.2.  Inspect and Measure. a. Check pushrod (9, FIGURE 3-27) as follows: (1) Lay pushrod on a surface plate. (2) Roll  pushrod  along  surface  plate  checking  for  curvature  with  a  feeler  gage.    Normal  reading  should  be 0.008 in.  (0.2 mm) or less. (3) Inspect  both  ends  of  pushrod  for  excessive  wear  or  damage.    If  excessive  wear  or  damage  is  found, replace pushrod. b. Inspect rocker lever valve stem contact surface for step wear and scoring.  If contact surfaces have light step wear or scoring, they may be honed with an oil stone.  If step wear or scoring is severe, rocker lever must be replaced. 3-26.3.  Installation. CAUTION Ensure  that  no  piston  is  at  TDC  when  Installing  pushrods.    Failure  to  follow  this  procedure  could cause damage to pushrods. a. Lightly  oil  pushrod  (9,  FIGURE  3-27)  with  engine  lubricating  oil  (MIL-L-2104)  and  install  it  in  cylinder  head. Ensure pushrod does not interfere with cylinder head clearance hole. b. Lightly oil rocker lever (6) and install it on cylinder head bolt (7).  Secure with nut (5) finger tight. c. Gradually tighten nut (5) until heel of rocker lever (6) makes contact with ball end of pushrod (9).  Ensure rocker lever is centered over valve stem. 3-47


 


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