ARMY TM 9-2815-256-24 AIR FORCE TO 38G1-96-2 MARINE CORPS TM 2815-24/5 FIGURE 3-135.  Spring Pin Protrusion CAUTION Upper and lower idler gear sleeve bearings (4 and 12, FIGURE 3-134) have the same ID, but are different.    Sleeve  bearing  with  spiral  oil  groove  goes  in  lower  idler  gear.    Sleeve  bearing  without groove  goes  in  upper  idler  gear  (pressure  lubed).    Do  not  intermix  sleeve  bearings  or  premature sleeve bearing failure will result. d. If  sleeve  bearings  (4  and  12)  were  removed,  use  an  arbor  press,  driver  (JD-252),  and  handle  (10914188)  to install sleeve bearing (4) in idler gear (3) and sleeve bearing (12) in idler gear (11). e. Install lower idler gear (11), thrust washer (10), and nut (8). f. Time camshaft and install upper idler gear (3), thrust washer (2), and capscrew (1), refer to paragraph 3-40.3. g. Install oil pan, refer to paragraph 3-20.3. h. Install timing gear cover, refer to paragraph 3-39.3. 3-42.  FRONT PLATE. 3-42.1.  Removal. a. Remove timing gear cover, refer to paragraph 3-39.1. b. Remove camshaft, refer to paragraph 3-40.1. c. Remove fuel injection pump and drive gear, refer to paragraph 3-27.1. d. Remove oil pump and drive gear, refer to paragraph 3-21.1. e. Remove idler gears, refer to paragraph 3-41.1. f. Remove five screws (1, FIGURE 3-136) and lockwashers (2) securing front plate (3); remove front plate (3) and gasket (4).  Discard gasket (4) and lockwashers (2). g. Remove oil bypass valve (6) and spring (5). h. If new front plate (3) is to be installed, remove setscrew plugs (7).  Discard plugs. Change 3 3-176