OPERATING AND MAINTENANCE—C.2 The cold starting procedure is however the same, i.e., Switch  on  by  turning  the  starter  switch  in  a  clockwise direction to the first position. Press  the  heater  button  for  fifteen  to  twenty  seconds and  then,  with  the  heater  button  still  pressed,  turn  the starter  switch  in  a  further  clockwise  direction  to  engage the starter motor.  As soon as the engine starts.  release both starter switch and heater button. Cold Starting Aid The   cold   start   unit   comprises   a   tubular   valve   body carried  in  a  holder  which  screws  into  the  inlet  manifold, and  surrounded  by  a  heater  coil,  an  extension  of  which forms  an  igniter  coil.    The  valve  body  houses  a  needle, the  stem  of  which  holds  a  ball  valve  in  position  against its seating. The whole is surrounded by an open perforated shield. Fuel oil from the container enters through an adaptor. When the unit is cold, the ball valve is held closed.  On switching   on   the   coil,   the   valve   body   is   heated   and expands.  opening the ball valve and permitting the entry of  fuel.    The  fuel  is  vaporized  be  the  heat  of  the  valve body  and  when  the  engine  is  cranked  and  air  is  drawn into    the    manifold,    the    vapor    is    ignited    by    the    coil extension and continue to burn, thus heating the inlet air. When  the  coil  is  switched  off,  the  flow  of  air  in  the manifold   cools   the   valve   body   rapidly   and   the   valve closes. The   cold   start   aid   is   a   sealed   unit   and   cannot   be dismantled.    If  the  unit  ceases  to  function,  it  must  be renewed. To Stop the Engine A spring loaded stop control i.  located near the engine controls  and  functions  by  cutting  off  the  fuel  at  the  fuel injection pump. To operate, pull (he knob and hold in this position until the  engine  ceases  to  rotate.    Ensure  that  the  control returns  to  the  run  position,  otherwise  difficulty  may  be experienced in restarting the engine Some engines, may have    an    electric    solenoid    stop    control    on    the    fuel injection pump operated by a switch on the control panel Turn start switch to the “O” position. Things to Note Always   be   sure   that   the   starter   pinion   has   stopped revolving  before  re-engaging  the  starter,  otherwise  the ring or pinion may be damaged. Ensure    that    the    electrical    connection    to    the    cold starting aid is correctly made. Always ensure that, if a reservoir is used to feed fuel to the  starting  aid,  it  is  fully  primed  and  is  not  leaking.    On later  engines,  the  starting  aid  fuel  feed  is  taken  directly from the fuel filter. In   the   event   of   difficult   starting,   check   that   fuel   is reaching the cold starting aid in the induction manifold by unscrewing the inlet fuel connection. If  fuel  is  reaching  it  satisfactorily,  then  it  may  be  that the  cold  starting  aid  itself  is  not  working  correctly.    This can    be    checked    by    removing    the    air    cleaner    and watching  the  cold  starting  aid  whilst  the  equipment  is used.    When  the  starting  switch  is  turned  to  the  "heat" position,  the  element  should  become  red  hot,  and  on engagement   of   the   starter   motor,   it   should   burst   into flame. 4.236      Marine   engines   are   fitted   with   efficient   cold starting     equipment     and     no     responsibility     can     be accepted    for    any    damage    caused    by    unauthorized starting aids. To present thermostart damage, it is essential that the thermostart  is  not  operated    DRY.    After  any  operation which allows fuel to drain from the thermostart feed pipe, the pipe must be disconnected at the thermostart and all air bled from the pipe before the thermostart is operated. Where  a  thermostart  starting  aid  has  to  be  replaced, care   must   be   taken   not   to   exceed   the   torque   figure quoted   on   Page   B.1.      Excessive   torque   loading   can crack  the  insulator  adaptor  causing  an  electrical  short and hard starting characteristics. Running-in Procedure It is not necessary to gradually run-in a new or factory rebuilt  engine  and  any  prolonged  light  load  running  can in fact prove harmful to the bedding in of piston rings and liners. Full  load  can  be  applied  on  a  new  or  factory  rebuilt engine as soon as the engine is used, provided that the engine coolant is first allowed to reach a temperature of at least 140° F (60° C).