TM9-2815-202-34 4-14.   TACHOMETER   DRIVE   REPLACEMENT This  task  covers: a.  Removal b.  inspection c.  -Installation INITIAL   SETUP MODELS MANDATORY  REPLACEMENT  PARTS All 1 Gasket (App F, Item 75) EXPENDABLE/DURABLE    SUPPLIES TOOLS  AND  SPECIAL  TOOLS Engine oil (App C, Item 16) General mechanics tool kit (App B,Item 96) a.   Removal (1)  Unscrew  tachometer  drive  adapter  (1)  from  adapter  fitting  (2).  Remove  key  (3). (2)  Unscrew  adapter  fitting  (2)  from  rear  blower  cover  and  remove  gasket  (4).  Discard  gasket. b.    Inspection c. (1) (2) Inspect key for damage or wear. Inspect  tachometer  drive  adapter  for damage  or  cracks. NOTE Check  for  free  movement  of  internal  shafts in  tachometer  drive  adapter. Installation (1) Install adapter fitting (2) with gasket (4) to rear blower cover. (2)  Install  key  (3)  to  shaft  assembly. (3) Screw tachometer drive adapter (1) onto adapter  fitting  (2).  Tighten  securely. END   OF   TASK 4-48 Change 1