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EGR VALVE APPLICATION CHART For 1980 U.S.A.  Model Engines
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TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
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Setting Procedure
ENGINE DIVISION SERVICE MANUAL TM 5-4210-230-14&P-1 15C. EGR  Maintenance  Indicating  System  (V-345  and V-392 Engines Only) This  system  is  used  to  alert  the  vehicle  operator,  after each 19200 Km (12,000 miles), that the EGR system must be serviced to insure that it is operating properly. The  system  consists  basically  of  a  switch,  or  revolution counting device, and an indicating light (Fig.  57). Fig.  57  EGR Maintenance Indicating System The   switch   is   triggered   by   a   counter   mechanism, similar to an odometer, which is connected in series with the speedometer cable.  After 19200 Km (12,000 miles), electrical contacts  inside  the  switch  snap  together  and  complete  the circuit to the indicator light (Fig.  58). Fig.  58  Reminder Light Switch Assembly The   red   indicator   light,   which   has   the   words   "Service EGR" on the face, is mounted on the instrument panel.  When lighted, the letters are easily visible even in the daylight. After   the   EGR   system   maintenance   is   performed,   the indicator light can be turned off and the switch reset by turning the reset screw (Fig.  58) about 450 (¼  turn).  This zeros the switch's  odometer  gears  and  opens  the  electrical  contacts. The switch is then ready to count the next 19200 Km (12,000 mile) interval. A  circuit  that  tests  the  indicator  light  bulb  during  engine starting is utilized, the same as the brake warning light. 16.   Check   Curb   Idle   Speed   and   Air;   Fuel   Mixture   and Adjust, as necessary. Adjustment procedure with Exhaust Analyzer Idle  speed  and  fuel  mixture  adjustments  must  be  made with parking brake applied, air cleaner in place, transmission in neutral and air conditioning "OFF". When   making   idle   adjustments   on   California   engines, disconnect   vacuum   hose   from   vapor   storage   canister   and plug  end  of  hose.    After  idle  adjustments  have  been  made, remove plug and reconnect hose to canister. To compensate for fuel and temperature variations when setting idle mixture, observe these precautions: a. Do  not  idle  engine  continuously  for  more  than  three minutes at one time. b. After  each  three  minutes  of  idling,  increase  engine speed to 2000 rpm for one minute. c. Continue with idle adjustment procedure.  Do not idle engine for more than three minutes without repeating Step b. Winter grade gasolines, being more volatile than summer grade,  can  yield  vapors  which  result  in  excessively  rich  or erratic air/fuel mixtures, particularly at high engine temperatures.    Because  of  this,  care  must  be  taken  when making  carburetor  idle  mixture  adjustments  with  the  exhaust analyzer.  Attempts to adjust the idle mixture screw(s) leaner to  overcome  a  rich  mixture  caused  by  evaporation  of  winter grade   fuel   at   high   engine   temperatures   can   result   in   an extremely lean mixture and associated starting and driveability problems  when  vehicle  is  cold.    Therefore,  with  winter  grade gasolines, CGES-215  Page 32 PRINTED IN UNITED STATES OF AMERICA

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