TM 5-3895-383-24 Fuel Timing Tools Needed 9U7305 Governor And Fuel System Adjusting Tool Group OR 1U6680 Governor And Fuel System Adjusting 1 Tool Group 4C4716 Injector Timing Fixture 1 1U8702 Injector Timing Block 1 1U6678 Calibration Fixture Group 1 6V6106 Dial Indicator 1 9S8883 Contact Point 1 or 1U8869 Digital Dial Indicator 1 3S3268 Contact Point 1 NOTE: Tool   Operating   Manual,   NEHS0610   is   included with    the    9U7305    Governor    And    Fuel    System Adjusting  Tool  Group  and  gives  instructions  for the testing and adjusting procedure. NOTE: Either   9U7305   or   1U6680   Governor   And   Fuel Adjusting  Tool  Groups  can  be  used  for  testing and  adjusting.    The  following  procedure  is  used for     the     former     1U6680     Governor     and     Fuel Adjusting Tool Group. NOTE: Earlier 1U6680 Tool Groups had a 1U6677 Injector Timing  Fixture.    The  5P4160  Contact  Point  [19.05 mm (.75 in) excluding the threads] must be used with the 1U6677 Injector Timing Fixture. Later   1U6680   Tool   Groups   have   a   lower   profile   4C4716 Injector  Timing  Fixture  (which  replaces  the  1U6677  Injector Timing Fixture) and is used for setting fuel timing on engines with limited room above the valve cover.  The 3S3268 Contact Point [6.35 mm (.25 in) excluding threads] must be used with 4C4716 Injector Timing Fixture. CRANKSHAFT POSITIONS FOR FUEL TIMING SAE STANDARD (COUNTERCLOCKWISE) ROTATION ENGINES AS VIEWED FROM THE FLYWHEEL END 3114 3116/4126 Injectors Injectors Check/Adjust with No. 1 Piston on TC Compression Stroke. 3-4" 3-5-6* 3114 3116/3126 Injectors Injectors Check/Adjust with No.1 Piston on TC Exhaust Stroke 1-2 1-2-4 *Note that the No. 1 injector is not checked or adjusted with the No.1 piston on TC Compression stroke.  Be certain that the No.  1  piston  is  TC  on  the  correct  stroke  (compression  or exhaust)    to    check    or    adjust    each    injector.        For    more information   refer   to   the   chart   CRANKSHAFT   POSITIONS FOR FUEL TIMING. NOTE: Always  turn  the  engine  with  the  four  large  bolts on  the  front  of  the  crankshaft.    Do  not  use  the eight  small  bolts  on  the  front  of  the  crankshaft pulley NOTE: if  the  rocker  arm  assemblies  are  removed  and installed     prior     to     setting     the     Fuel     Timing Dimension,   rotate   the   crankshaft   two   complete revolutions  to  allow  the  rocker  arms  to  properly seat on the injectors. 1. Put No. 1 piston at top center (TC) position and make identification   for   the   correct   stroke   (compression   or exhaust).        Make    reference    to    Finding    Top    Center Position For No. 1 Piston. See chart Crankshaft Positions For Fuel Timing.  With the two crankshaft positions given in the chart, all of the injectors can be checked or adjusted.  This will make sure the push rod lifers are off the lobes and on the base circles of the camshaft. NOTE: Two dial indicators each with their own procedure are  available  for  this  procedure.    If  the  1U8869 Digital Dial Indicator is to be used, use Procedure B.  If the 6V6106 Dial Indicator is to be used, use Procedure A. 6-71