TM 5-4210-230-14&P-1 VEHICLE OPERATION ENGINE FUEL REQUIREMENTS (GASOLINE) Your engine is designed to operate efficiently in normal operations   on   "Regular"   grade   fuels   of   at   least   91   RON (Research Octane Number) or 86.5 anti-knock index designation.  The latter figure is now generally posted on fuel dispensing  pumps.    It  is  recommended  that  the  maximum octane  rating  used  be  no  more  than  four  octane  numbers above the minimum of 91 octane.  "Low Lead" fuel containing at least .13 gpl (.05 gpg) lead, or the equivalent additive, per liter (gallon) may be used. Continuous use of gasoline which is completely free of lead,  or  other  lubricating  additives  such  as  phosphorous,  is not  recommended.    Prolonged  use  of  such  fuel  can  cause excessive    exhaust    valve    seat    wear    resulting    in    loss    of emission    control,    poor    performance    and    possible    engine failure.  Use of a fuel which is to low in anti-knock quality will result   in   "spark   knock".      Since   anti-knock   quality   of   all "Regular" grade gasolines is not the same and factors such as altitude, terrain and air temperature affect operating efficiency, knocking  may  result  even  though  you  are  using  the  grade  of fuel recommended for your engine. ENGINE FUEL AND LUBRICANT ADDITIVES The    following    is    the    International    Harvester    Truck Division's  policy  on  the  use  of  fuel  and  lubricant  supplement additives. "It is the International Harvester Truck Division's policy to  develop  and  build  trucks  that  will  operate  satisfactorily  on fuels and lubricant of good quality marketed by the petroleum industry.  The Truck Division does not recommend the use of any  supplementary  fuel  or  lubricant  additives.    The  vehicle warranty shall not apply to any unit which has been subjected to  misuse,  negligence  or  accident.    Malfunctions  attributable to   neglect   or   failure   to   follow   the   manufacturer's   fuel   or lubricating recommendations may not be within the coverage of the warranty." ENGINE GOVERNED SPEEDS The  governor  has  two  functions:    First,  it  provides  the exact  amount  of  fuel  needed  for  idling  position.    Second,  it overrides the throttle and shuts off fuel if engine rpm exceeds the maximum rated speed. ENGINE SHUTDOWN A  basic  rule  of  good  engine  operation  concerns  the importance  of  idling  the  engine  from  three  to  five  minutes before shutting down.  This few minutes  idling  allows  the  lubricating  oil  and  water  to  carry heat away from the iron masses. The  larger  the  engine,  the  greater  the  need  for  this idling  period  and  of  course,  the  length  of  the  idling  period should  somewhat  follow  the  size  of  the  engine  in  order  to avoid  seals  or  like  features  of  an  engine  being  damaged  by rising heat. To  stop  the  engine  turn  the  ignition  switch  to  "OFF" position  and  pull  out  on  engine  fuel  shut-off  control  (diesel only) until engine stops. ENGINE SHUT-OFF LPG ENGINE After the engine has completed its run and the engine is  to  be  shut-off  for  an  indefinite  period  of  time,  it  will  be necessary to close all tank valves and run the engine until the fuel is exhausted. ENGINE STARTING If  your  vehicle  is  equipped  with  push  button  starting system,  turning  key  to  the  right,  then  pushing  in  on  starting button starts the engine. If  your  vehicle  is  equipped  with  ignition  switch  key  starting system  turning  key  to  the  extreme  right  engages  the  starting motor. IMPORTANT Depending  on  starting  system,  either  release the push button or ignition switch key instantly after   engine   starts   to   avoid   damage   to   the starting  motor.    If  the  engine  does  not  start promptly, DO NOT OVERTAX THE STARTING MOTOR OR THE BATTERY.  Do not   use   the   starting   motor   longer   than   30 seconds at a time. Wait at least 15 seconds between attempts to start the engine to prevent heat (generated in the starting motor) from scorching the starting motor commutator. CAUTION DO    NOT    START    OR    RUN    AN    ENGINE WITHOUT   VEHICLE   BEING   COMPLETELY VENTILATED  AT  ALL  TIMES.    Exhaust  gas from all internal combustion engines contains posionous   carbon   monoxide   gas   which   is odorless,    tasteless,    and    colorless.        When vehicle  is  started  inside,  keep  garage  doors wide open.  This poisonous carbon monoxide | gas will not only cause drowsiness, but could be  fatal.    Proper  ventilation  while  operating vehicle must be adhered to. 5