TM 5-6115-590-12 (3)   Refer  to  figure  4-44  and  reconnect  all  tube assemblies   to   fuel   control   unit   using   new   packings. Connect wiring harness connector to fuel solenoid valve. c. Test. (1)   Connect   fuel   control   assembly   to   engine analyzer  as  shown  in  fig.  4-16  and  check  acceleration limiter valve cracking pressure as follows. (a)   Disconnect   fuel   line   from   tee   at   fuel control  discharge  pressure  connection  part,  (fig.  4-16) and install a 0 to 100 psig pressure gauge. (b)   Disconnect control air line at acceleration limiter valve tee. (c)   With     fuel     supplied     to     fuel     control assembly   at   15   psig,   move   master   switch   (S1)   (fig. 2-11),   sheet   1   of   2)  on   power   unit   instrument   panel assembly to START position and motor engine. CAUTION Do not exceed starter motor duty cycle. (d)   While    motoring    unit,    check    cracking pressure.  Cracking pressure should be 44 ±  1 psig. To adjust, hold acceleration limiter valve adjustment screw (fig. 4-16) on fuel control assembly and loosen locknut. Adjust   screw   position   using   screwdriver   and   wrench assembly (special tools).  To increase cracking pressure turn acceleration limiter valve adjustment screw clockwise.  To decrease pressure, turn adjustment screw counterclockwise. CAUTION Do   not   turn   adjustment   screw   more than three full turns in either direction. (e)   When  satisfactory  cracking  pressure  is attained, tighten locknut. (f) Reconnect  control  air  pressure  line  to acceleration limiter valve.  Remove gauge from tee on fuel  control  assembly,  reconnect  fuel  line,  disconnect and remove gas turbine engine analyzer. (2)   Check  fuel  control  governor  speed  setting as follows: (a)   Connect gas turbine engine analyzer  to power unit as described in paragraph 4-14b.  Use tach- generator rpm gauge (fig. 4-14) on    analyzer    panel    to check engine speed. (b)   Start engine (fig. 2-11)   and    accelerate to  no  load  governed  speed.    Operate  at  this  speed  for approximately two minutes to stabilize operation. (c)   Apply full load to engine.  To apply load, open compressed air outlet as described in fig. 2-18 and operate cooled air system as described in fig. 2-15. (d)   With engine operating at full load, tach- generator rpm gauge (fig. 4-14) should  read  4150   ±  10 rpm (equal to an engine spec of 40,700  ±  100 rpm). (e)   If   tach-generator   rpm   gauge   does   not read   4150   ±    10    rpm    use    screwdriver    and    wrench assembly   (special   tools)   to   adjust   full   load   governed speed. (f) Hold governor adjustment screw (fig. 4- 16)  on  fuel  control  assembly  and  loosen  locknut.  Turn governor   adjustment   screw   clockwise   to   increase   full load governed speed, and counterclockwise to decrease full    load    governed    speed.        When    adjustment    is satisfactory, tighten locknut. CAUTION Do   not   turn   screw   more   than   three turns in either direction. (g)   Close compressed air outlet as described  in  fig.  2-18,  shut  off  cooled  air  system  as described in fig. 2-15, and return the engine to no load governed speed. (h)   Tach-generator   rpm   gauge   (fig.   4-14) should  read  4242  rpm  (maximum)  (equal  to  an  engine speed of 41,600 rpm). (i) If   tach-generator   rpm   gauge   does   not read 4242 rpm (maximum), use screwdriver and wrench assembly (special tools)to    adjust    no    load    governed speed setting. (j) Hold   governor   adjustment   screw   (fig. 4-16) on   fuel   control   assembly   and   loosen   locknut. Turn  adjustment  screw  clockwise  to  increase  no  load governed   turn   adjustment   screw   counterclockwise   to decrease no load governed speed. (k)   When adjustment is satisfactory, tighten locknut,   disconnect   and   remove   gas   turbine   engine analyzer. 4-77.  Fuel Control Unit Filter a. Removal.      Without   removing   the   fuel   control unit  from  the  engine,  unscrew  filter  cap  as  shown  in figure  4-45  and  remove  and  discard  filter  element  and packings. b. Cleaning and Inspection. (1)   Wash  filter  cap  with  an  approved  cleaning solvent and dry thoroughly with filtered compressed air. (2)   Visually inspect filter cap for cracks, corrosion,  damaged  threads  or  other  signs  of  obvious damage.  Replace filter cap if found to be damaged. c. Installation.    Install  replacement  filter  element and new packings in reverse order of removal. Tighten filter cap securely but do not overtorque. 4-78.  Engine Fuel Filter Element a. Removal.      Without   removing   the   engine   fuel filter assembly (fig. 4-44) from power unit, unscrew filter case   from   filter   assembly   as   shown   in   figure   4-45. Remove and discard filter element, packing and gasket. 4-98