TM 1-1500-204-23-1 WARNING Dry-cleaning    solvent    is    flammable and solvent vapors are toxic.   Use P- D-680,   Type   II   Solvent   in   a   well- ventilated   area.      Keep   away   from open     flames.          Avoid     prolonged solvent contact with skin. (a)   Clean  lead  assembly  with  dry-cleaning solvent,  Federal  Specification  P-D-680.    Replace  any lead  having  fraying  shielding,  bent  or  mutilated  socket contacts or contact pins, and worn or stripped threads on coupling nuts. NOTE Minor chafing or fraying to the extent of     not     more     than     three     broken strands in one inch of harness length is  permissible,  providing  there  is  no damage to the underlying insulation. (b)   Clean control harness leads with methylethylketone, Federal Specification TT-M-261, dry with  air  blast.    Replace  harness  when  it  is  found  to  be open or shorted. (2)        Igniter     plugs.          Perform     igniter     plug maintenance as explained by the following procedures. (a)   Keep   all   igniter   unit   connections   tight and  all  leads  and  conduit  free  from  abrasions  or  other damage   Accomplish   the   following   steps   when   igniter plugs fail to spark. 1 When    two  igniter  plugs  fail  to spark,  replace  one  plug  and  energize  system.    When plug   sparks,   replace   other   plug   and   retest   Replace igniter unit when plug fails to spark. 2 When   one   plug   fails   to   spark and a new plug does not remedy defect, replace igniter plug lead. If plug still fails to spark, replace igniter unit (b)   Igniter    plugs    not    heard    firing    when engine is started shall be cleaned or replaced as follows: 1 Clean   barrel   of   igniter   plugs with  a  wire  brush    Buff  threads  with  a  cloth  wheel.    Do not clean nose end and electrode. 2 Replace     plugs     with     cracked insulation,  damaged  threads  or  pin  contacts,  or  when foreign material is found lodged In nose of plug. 3 Replace igniter plugs that fail to produce continuous and regular sparking (3)   Ignition   exciter.      Refer   to   the   applicable maintenance manual for Ignition exciter maintenance. I. Turbine Bearing Maintenance.   Turbine engine bearings  shall  be  inspected,  removed,  and  replaced  in accordance with the applicable maintenance manual. m.   Thermocouple Maintenance. Replace thermocouple   leads   that   Indicate   a   short   or   an   open condition.  Clean carbon from thermocouples by dipping in    carbon    removing    compound,    MIL-C-19853,    and wiping deposit away with a clean cloth. n. Oil   Consumption      Check   oil   consumption   in accordance   with   the   applicable   maintenance   manual. The   following   formula   can   be   used   to   calculate   oil consumption in cc per hour. cc of oil added x 60 min Recorded operating time 1 hr in minutes = Oil consumption time in cc/hr o. Fuel  System.    Fuel  system  maintenance  shall be   accomplished   in   accordance   with   the   applicable maintenance manual.  General maintenance procedures are described in the following paragraphs. (1)   Fuel    control    inspection    and    adjustment. Fuel control inspection and adjustment are explained in the following paragraphs. (a)   Fuel   control   inspection.      Perform   the following procedures when inspecting fuel controls: 1 Inspect  housing  for  cracks  and leakage. 2 Inspect     strainer     element     for nicks, tears, punctures, and broken wires. 3 Inspect    springs    and    balls    for corrosion 4 Inspect  cover  for  nicks,  dents, and scratches. 8-17