TM 10-3930-659-34 4-5. CYLINDER HEAD ASSEMBLY REPLACEMENT (Con’t). WARNING Use extreme  caution  when  handling  heavy  parts.    Lifting  device  is  required  when parts weigh over 50 lb (23 kg) for a single person lift, over 100 lb (45 kg) for a two person  lift,  and  over  150  lb  (68  kg)  for  a  three  or  more  person  lift.    Keep  clear  of heavy  parts  supported  only  by  lifting  device.    Failure  to  follow  this  warning  may cause serious injury or death to personnel. 3. Using suitable lifting device, position cylinder head (2) on engine block (4). 4. Apply lubricating oil to threads of 26 screws (1) and install screws on cylinder head (2). 4-17