Quantcast Fast Idle Adjustment (cont)

Order this information in Print

Order this information on CD-ROM

Download in PDF Format

     

Click here to make tpub.com your Home Page

Page Title: Fast Idle Adjustment (cont)
Back | Up | Next

Click here for a printable version

Google


Web
www.tpub.com

Home


   
Information Categories
.... Administration
Advancement
Aerographer
Automotive
Aviation
Combat
Construction
Diving
Draftsman
Engineering
Electronics
Food and Cooking
Math
Medical
Music
Nuclear Fundamentals
Photography
Religion
USMC
   
Products
  Educational CD-ROM's
Printed Manuals
Downloadable Books
   

 

Share on Google+Share on FacebookShare on LinkedInShare on TwitterShare on DiggShare on Stumble Upon
Back
Fast Idle Adjustment
Up
TM-5-4210-230-14P-1 Aerial Ladder Fire Fighting Truck Manual
Next
Adjustment Procedure With Exhaust Analyzer
TRUCK SERVICE MANUAL TM 5-4210-230-14&P-1 ADJUSTMENT PROCEDURE NOTE: Record the number of turns it takes to increase or decrease the engine RPM to the specified speed shown: V-392 2000 RPM MV-404, 446 2400 RPM V-537, 605 2000 RPM 4.    Run  curb  idle  stop  screw  in  until  it  contact  the  internal stop. 5.  Release choke as it opens completely. 6.      Start   engine,   observe   and   record   (RPM)   tachometer reading.    If  RPM  reading  does  not  correspond  with  fast  idle speed specification chart, an adjustment should be made. 7.  To increase RPM, continue to turn the curb idle screw until proper fast idle speed is reached (See Fig.  53). 8.    Before  shutting  off  engine  back  out  curb  idle  screw  until engine speed is reduced to curb idle speed to prevent engine dieseling.  Shut off engine (See Fig.  42). 9.      Depress   accelerator   pedal   to   floor.      Close   choke   and release accelerator pedal. Figure   54      Adjusting   Fast   Idle   Screw   With   SE-1772-18 Wrench 10.    Reset  curb  idle  screw  until  it  lightly  contacts  the  inner stop.    Turn  the  idle  screw  in  the  number  of  additional  turns recorded (in Step 8) to reach proper fast idle speed setting. 11.    Adjust  fast  idle  screw  with  special  wrench  SE-1772-18 until the screw just contacts the fast idle cam (See Fig.  54). Contact   is   established   when   visual   clearance   between   the screw  and  the  cam  is  eliminated  or  when  the  throttle  lever starts to move. 12.  To recheck adjustment, choke closed, back out idle screw two turns and then reset screw until lightly contacting internal stop. 13.  Open choke, start engine, proper engine RPM should now be obtained. 14.  Repeat Step No.  9. 15.    Reinstall  spring  on  idle  speed  screw  and  install  screw with spring. 16.    Reinstall  air  cleaner  and  adjust  proper  curb  idle  speed (See Specifications). Idle  Speed  and  Fuel  Mixture  Adjustment  Procedure  Without Exhaust Analyzer (Speed Drop Method) 1.    Connect  tachometer  to  engine  (Tachometer  should  have expanded scale of 400-800 RPM or 0-1000 RPM and 1%-2% accuracy.) 2.  Turn idle mixture screw(s) "out" (counterclockwise) against tab stop. NOTE: If working with a unit rebuild which has not had the idle limiter caps installed, refer   to   specification   for   the   initial   idle setting. 3.  Operate engine until thoroughly warmed up. 4.  Adjust idle speed screw to give engine speed higher than specified idle speed.  (See "Specifications".) 5.      Turn   idle   mixture   screws   "in"   (clockwise)   slowly   and equally  until  specified  idle  speed  is  obtained.    The  resulting idle fuel mixture is optimum for exhaust emission control. NOTE:  If  working  with  unit  rebuild,  install idle limiter caps at this time. 6.  If engine runs rough after obtaining specified idle speed or if specified idle speed cannot be obtained (per Steps 4 and 5), it   will   be   necessary   to   remove   the   idle   limiter   caps   and establish proper mixture screw setting as follows: a.  Remove limiter caps.  To prevent damaging screw threads or seat, file or grind away the side of the cap.  Do not pry cap off. b.    With  engine  operating,  adjust  mixture  screws  to  obtain "lean best idle" at the specified idle speed.  ("Lean best idle" is the point at which engine speed drops approximately 10 RPM due to leanness.) CGES-125-T  Page 36 PRINTED IN UNITED STATES OF AMERICA

Privacy Statement - Press Release - Copyright Information. - Contact Us - Support Integrated Publishing

Integrated Publishing, Inc.