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ARMY TM 9-2815-255-24 AIR FORCE TO 38G1-95-2 MARINE CORPS TM 2815-24/4 b. Inspect rocker arm shaft for severe scratching, scoring, or excessive wear at points of rocker arm contact.  Wear could indicate weak valve springs, bent pushrods, or loose rocker arm shaft clamps. c. Roll rocker arm shaft on a flat surface to check for bends or distortion.  Replace shaft as necessary. d. Measure  rocker  arm  shaft  OD  at  each  rocker  arm  location.    New  rocker  arm  shaft  OD  is  0.787  to  0.788  inch (19.99 to 20.02 mm).  If rocker arm shaft OD is smaller than 0.785 inch (19.94 mm), install a new shaft. e. Inspect and measure each rocker arm shaft support ID.  If ID is more than 0.794 inch (20.17 mm), install a new shaft support. f. Inspect and measure rocker arm ID.  New rocker arm ID is 0.790 to 0.792 inch (20.07 to 20.12 mm).  If rocker arm ID is over 0.794 inch (20.17 mm), install a new rocker arm. g. Check  rocker  arm  adjusting  screw  for  damage.    Visually  inspect  rocker  arm  for  hairline  cracks.    Replace  if necessary. h. Check for cups or concave wear on ends of rocker arms where they contact valve tips.  If wear exists, replace rocker arm. WARNING Cleaning solvent Is flammable and toxic to eyes, skin, and respiratory tract.  Skin/eye protection required.  Avoid repeated/prolonged contact.  Good general ventilation is normally adequate. WARNING Compressed air used for cleaning can create airborne particles that may enter the eyes.  Pressure will not exceed 30 psig (207 kPa).  Eye protection required. i. Thoroughly   clean   all   rocker   arm   assembly   components   with   dry   cleaning   solvent   (P-D-680).      Dry   with compressed air. j. Clean pushrods with dry cleaning solvent (P-D-680) and compressed air. k. Check pushrods for straightness by rolling on a flat surface. I. Inspect pushrods for wear, damage, or any physical distortion. m. Replace defective pushrods that do not pass inspection. 3-33.4.  Assembly. a. Lubricate OD of shaft (7, FIGURE 3-98), bores of rocker arms (8), and supports (3) with clean engine lubricating oil (MIL-L-2104). CAUTION Make sure during assembly that main oil supply hole on rocker arm shaft (7) faces flywheel end, to avoid engine damage. b. Slide spring (9), rocker arms (8), and rocker arm supports (3) onto shaft (7).  Assemble in same order as they were before disassembly. 3-135


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