TM 10-3930-653-14&P Fig. 4-34.  Removing Valve Spring 37.  Remove bolts from rocker shaft bracket. 38.  Remove  cotter  pin,  washer,  and   outer   spring   and then remove rocker arm shaft and bracket in that order. Fig. 4-35.  Disassembling Valve Rocker Parts 39.  Remove  lock  nuts  and  adjusting  nuts  from   rocker arm. WARNING Exercise   care   when   removing   snap rings,   these   parts   are   under   spring tension.    Severe  injury  may  result  by the part striking your eye if you don’t observe  this  precaution.    If  your  eye is   struck   by   a   foreign   object,   seek medical aid immediately. 40.  Remove  piston  rings  beginning  with  top  ring  (A  ring expander helps but is not mandatory) 41.  Extract piston pin. Piston  pin  and  connecting  rod  are  a  press  fit.    To remove   piston   pin,   first   remove   snap   rings   and   heat piston [80°C (176°F)] and press out pin. Note:  Keep  piston,  piston  pin,  piston rings   and   connecting   rod   for   each cylinder together so that they are not interchanged   (mixed)   with   parts   for other cylinders. 4-2-4. INSPECTION AND REPAIR 4-2-4-1. PREPARATIONS FOR INSPECTION WARNING Dry  cleaning  solvent  P-D-680  is  toxic and     flammable.          Wear     protective goggles and gloves and use only in a well  ventilated  area.    Avoid  contact with skin, eyes, and clothes and don’t breathe   vapors.      Do   not   use   near open flame or excessive heat.  If you become    dizzy    while    cleaning    with solvent, get fresh air immediately and get  medical  aid.    If  contact  with  skin or clothing is made, flush with water. If  contact  with  eyes  is   made,   wash your eyes with water and get medical aid immediately. WARNING Compressed   air   used    for    cleaning purposes will not exceed 30 PSI.  Use only with effective chip guarding and personal protective equipment (goggles/shield, gloves, etc.). (1)   Prior  to  cleaning,  check  cylinder  head  and  cylinder block for water leakage. (2)   Thoroughly  clean  all  compartments  and  completely remove all oil, grime, sealing, etc. (3)   Blow  compressed  air  through  oil  passage  in  main gallery,    etc.    To    make    sure    that    passages    are    not clogged. (4)   lay   out   components   such   as   main   bearing   cap, connecting  rod,  etc.  as  individual  assemblies  or  groups (for   each   cylinder)   so   that   they   are   not   interchanged (mixed). 4-2-4-2. INTAKE MANIFOLD WATER JACKET (1)   Check   water  jacket  plate  for  leakage.    If   there  is leakage, replace gasket. (2)   Also  check  water  hose  for  deterioration  or  damage, replacing   if   necessary.      If   water   leaks   at   or   around connection, retighten clamp. 4 - 27