TM 10-3930-669-34 Engine   retains   extreme   heat   when   in   operation.   Allow   time   for   cooling   before   performing troubleshooting procedures. Failure to do so may result in injury to personnel. VISUAL INSPECTION Inspect engine for missing oil plug. (a) If oil  plug  is  missing,  replace  oil  plug  (Para  3- 4). (b) If oil plug is not missing, oil plug is OK. 2-33