(2)   Place   master   switch   in   preheat   position. Lamps  L2  and  L3  shall  light  indicating  that  the  pre- heat   circuitry   is   correct. (3)  Place  master  switch  in  start  position.  Lamps L1,  L2,  L3,  L-4,  L5  and  L6  shall  light  indicating  that all   circuits   for   starting   are   correct. (4)  With  the  master  switch  in  the  start  position, open  switch  S1.  Lamp  L1  shall  extinguish  indicating that  the  start  disconnect  circuitry  is  correct. (5)  With  the  master  switch  in  the  start  position. Close  switch  S2  and  then,  place  the  master  switch  in the  prime  and  run  position.  Lamps  L2  and  L3  shall extinguish.   Lamps   L4,   L5   and   L6   shall   remain   lit indicating  that  the  prime  and  run  circuitry  are  cor- rect. (6)  With  the  master  switch  in  the  prime  and  run position and lamps L4, L5 and L6 lit open switch S2. Lamp  L4  shall  extinguish  indicating  that  the  engine protective   devices   circuit   and   the   prime   circuit   is correct. (7)  Repeat  the  procedure  of  step  5,  except  that the  master  switch  shall  be  placed  in  the  prime  and run  aux  fuel  position  after  closing  switch  S2.  Lamps L4,   L5,   L6   and   L7   shall   remain   lit   indicating   that the  prime  and  run  aux  fuel  circuitry  is  correct. (8)  With  the  master  switch  in  the  prime  and  run aux  fuel  position  and  lamps  L4,  L5,  L6  and  L7  lit open switch S2. that   the   engine prime  circuit  is Lamp  L4  shall  extinguish  indicating protective   devices   circuit   and   the correct. TM  5-6115-584-12 NAVFAC P-8-622-12 TO-35C2-3-456-1 TM-05682C-12 (9)  Place  master  switch  in  the  stop  position. All  lamps  shall  be  out  indicating  that  all  stop  circuits are   correct. (10)  Place  panel  light  switch  in  the  on  position Panel  lights  shall  be  on  indicating  that  the  panel  light circuit   is   correct. (11)  Reposition  all  switches  as  in  step  1  and  dis- connect  test  setup. (12) Test CR1 and CR2 as follows: (a)  Remove  wires  from  terminals  6  and  7  of A1. (b)  Measure  forward  and  backward  resistance of  CR1  between  terminals  5  and  6  of  A1.  Resistance should read high in one direction and low in the other. If not, CR1 is bad. (c)  Measure  forward  and  backward  resistance of  CR2  between  terminals  7  and  8  of  A1.  Resistance should read high in one direction and low in the other If not, CR2 is bad. g.  Install. (1) Control Cubicle. Attach control cubicle (1, figure 4-34) to four vibration mounts (5) with four screws (2), Iockwashers (3), and flatwashers (4). Attach ground strap (7) to cubicle support frame with screw  (6) and  nut  (8).  Attach  two  connectors  from  wiring  har- ness  to  connectors  on  back  of  control  cubicle.  On  ASK  equipped generators, install rear panel assembly (para. 5-7). Section XIII. MAINTENANCE OF ENGINE 4-39. DESCRIPTION AND FUNCTION. (See   figure   4-36.   )   The   engine   assembly   is   a   two cylinder,   air   cooled,   overhead   valve,   fuel   injected diesel   equipped   with;   a   blower   housing   (1)   and   a shutter   assembly   (2)   used   to   direct   and   control cooling  air,  an  oil  cooler  (3)  and  gear  type  oil  pump used   to   cool   and   circulate   lubricating   oil   in   the engine,  a  replaceable  cartridge  type  oil  filter  (4)  to remove contaminants  from  the  lubricating  oil,  fuel injection  pump  (5)  to  supply  metered  fuel  to  the engine   combustion   cylinders   through   fuel   injectors located  in  the  cylinder  heads,  air  intake  manifold  (16) and  heaters  (18)  that  receive  combustion  air  from  the external  air  cleaner  (9)  and  heat  the  combustion  air if  required,  starter  motor  (6)  coupled  to  the  engine drive  gear  for  cranking  the  engine  for  starting,  a  cor- rosion  resistant  exhaust  muffler  (7)  to  reduce  engine exhaust  noise,  and  a  mechanical  governor  used  to maintain  engine  speed  at  1800  RPM  under  varying load. 4-40.  EXHAUST  MUFFLER  ASSEMBLY a.   Inspect   (see   figure   4-37).   If   engine   exhaust   is noisy  or  if  exhaust  gases  are  detected  from  shutter assembly,  indications  are  that  muffler  (3)  or  gaskets (4) and (6) may be defective. b.   Remove.   Remove   shutter   assembly   as   outlined in  paragraph  4-17.  Bend  lock  tabs  (2)  down  and remove   four   nuts   (1)   holding   muffler   (3)   in   place. Remove lock tabs (2), mufflers (3). muffler gaskets (4), adapters   (5)   and   adapter   gaskets    (6)  from  each cylinder   head. c.  Replace.  Place  gaskets  (6),  adapters  (5)  in  place on  each  cylinder  head.  Slide  new  muffler  gaskets  (4), muffler  (3),  and  lock  tabs  (2)  over  studs  (7)  in  cyl- inder  head  and  secure  to  cylinder  head  with  nuts  (1). Change   7 4-45