TM 10-3930-664-24 NOTE When     installing     new     bushing,     mark cylinder  block  to  ensure  that  oil  hole  in bushing aligns with oil hole in bore. 8. Inspect  valve  tappet  socket,  stem,  and  face  for excessive wear or cracks. 9. Measure  tappet  stem  diameter.    Diameter  shall be at least 0.627 in.  (15.93 mm). D. INSTALLATION 1. Apply   Lubriplate   105   to   stems   of   tappets   (6). Insert  tappets  into  bores  in  bottom  of  cylinder block. 4-30