TM 5-6115-590-12 meter bracket from engine. (2)   Remove  wiring  harness  leads  from  circuit breaker (fig. 4-41). (3)   Remove   attaching   nut   and   washer   from bracket and remove circuit breaker. b. Installation. (1)   Install  replacement  circuit  breaker  in   time totalizing  meter  bracket.    Secure  with  attaching  washer and nut. (2)   Connect    wiring    harness    leads    to    circuit breaker. (3)   Install    time    totalizing    meter    bracket    in engine  bracket  and  secure  with  attaching  washers  and screws.  Tighten screws securely. 4-73. Exhaust Gas Thermocouple a. Removal. (1)   Remove wiring harness leads from thermo- couple (fig. 4-41).  Note that chromel lead is matched to CR marking and alumel lead is matched to AL marking. (2)   Remove   two   special   attaching   bolts   and washers   and   remove   thermocouple   from   engine   and exhaust flange. b. Cleaning, Inspection, and Replacement. (1)   Clean    thermocouple    using    an    approved solvent.  Dry thoroughly with filtered compressed air. (2)   Visually  inspect  ceramic  portion  of  thermo- couple    for    cracks.        If    ceramic    is    cracked    replace thermocouple. (3)   Inspect terminals for security in ceramic and for  bending  or  damaged  threads.    If  terminals  fail  to meet inspection requirements and are damaged beyond repair, replace thermocouple. (4)   Use   a   multimeter   to   check   for   continuity between  terminals.    If  there  is  no  continuity,  replace thermocouple. c. Installation. (1)   Coat  threads  of  special  attaching  bolts  with thin film of compound (Fel-Pro C-5). (2)   Install  replacement  thermocouple  in  engine exhaust flange. (3)   Secure    thermocouple    with    washers    and coated special attaching bolts.  Tighten bolts to 50 to 75 inch-pound torque. (4)   Reconnect wiring harness leads to thermocouple. NOTE Insure   chromel   lead   is   matched   to   CR marking  and  alumel  lead  is  matched  to AL marking. 4-74. Engine Wire Harness a. Removal.    Prior  to  removing  the  engine  wiring harness    (fig.    4-41),    tag    or    otherwise    identify    all connectors,   terminals   and   electrical   leads,   and   note routing    and    support    clamp    positions    as    an    aid    at installation.        Remove    harness    at    connectors    and terminals. b. Cleaning and Inspection. (1)   Clean wiring harness assembly with filtered compressed air or wipe with a clean rag moistened with an approved cleaning solvent. (2)   Visually   inspect   for   burned,   bent,   loose, corroded   or   otherwise   damaged   connector   pins   and terminals.  Inspect wiring for breaks, loose connections, or  other  obvious  damage.    Inspect  insulation  for  burns, chafing   and   deterioration.      Report   defects   to   direct support   maintenance   for   repair   or   replace   defective wiring harness. c. Test.    Check  continuity  of  wires  using  a  multi- meter  or  continuity  light.    Refer  to  figure  1-5  and  FO-3 (located  in  back  of  manual)  for  wire  routing.  Continuity must be indicated through individual wires. d. Installation.    Install  wiring  harness  assembly  in reverse order of removal. 4-75. Fan Assembly, Oil Cooling a. Removal. (1)   Loosen   clamp   and   remove   end   of   hose assembly   from   inlet   flange   of   fan   outlet   flange   and remove  ends  of  support  assembly  and  hose  assembly from outlet flange of fan assembly, (fig. 4-43). b. Installation. (1)   Install replacement cooling fan assembly on accessory gearcase using new packings. (2)   Secure fan assembly with attaching washers and bolts.  Tighten bolts to 50 to 70 inch- pound torque. (3)   Reconnect  end  of  hose  assembly  and  duct support assembly to fan outlet flange.  Tighten screws in support   assembly   securely.      Reconnect   end   of   hose assembly  and  clamp  to  fan  inlet  flange.  Tighten  clamp securely. 4-76. Fuel Control Assembly a. Removal. (1)   Remove wiring harness connector from fuel solenoid   and   remove   all   tube   assemblies   from   fuel control assembly (fig. 4-43). (2)   Remove    four    attaching    nuts    and    three washers and carefully remove fuel control unit (fig. 4-44) from engine in a straight line to avoid damaging the fuel control drive shaft. b. Installation. (1)   Refer   to   figure   4-43   for   orientation   and install  replacement  fuel  control  assembly.    Insure  that fuel control drive shaft splines are properly meshed. (2)   Secure in place with attaching washers and nuts.  Tighten nuts to 50 to 70 inch-pounds torque. 4-97