TM 10-3930-671-24 Oil Piston and Rings 3.To install the balance of the rings, use a ring tool with recess  side  up  and  place  the  ring  in  with  the  bottom side up.  Start with the lowest ring first. a. Position  ring  in  the  tool  so  the  expanding fingers will fully engage both ends. b. Apply    pressure    on    handles    so    ring    is completely  expanded.    Pass  the  expanded ring  and  tool  recessed  side  down  over  the piston to the proper groove. Install Tapered Rings with “Top” Side Up CAUTION Some piston rings are taper faced.  These are clearly marked ’TOP" on the side to be up when assembled on piston, and some rings have the top side marked with  a  color  band  or  a  PIP  mark.    The  pistons  have offset  piston  pins.    Be  sure  to  Install  pistons  with notch or arrow In top toward the front of the engine. 4.When pistons are ready for installation in the cylinders, oil generously.  Compress rings carefully using a good ring  compressor  and  a  light  tap  on  the  head  of  the piston  will  allow  the  assembly  to  go  into  the  cylinder very  easily.    If  any  difficulty  in  tapping  piston  and  ring assembly     into     the     cylinder     is     encountered,     the compressor should be removed and rings checked for correct installation in the groove. CRANKSHAFT & MAIN BEARINGS 1.  Using a puller, remove pulley from crankshaft. 2.  Remove screws and remove gear cover. 3.  Remove the crankshaft gear and woodruff keys. 4.  Using a puller, remove cam gear and injection pump drive gears. 5.      Remove   the   oil   pump   and   key   by   removing   cap screws holding pump to front of the engine. Removing Injection Pump Drive Gear 6.Remove  each  main  bearing  cap,  one  at  a  time,  and inspect the bearing and crankshaft journals. If there is any  indication  of  flaking  out,  scoring  or  actual  wear  - they must be replaced. F-178