SERVICE MANUAL CALIBRATION Section 5 INJECTION PUMP CALIBRATION Following    injection    pump    or    governor    service    and overhaul,   the   pump   must   be   recalibrated   to   establish correct    internal    timing,     fuel     delivery     and     governor operation.  It is also recommended that pump calibration be  checked  on  a  calibrating  stand  anytime  the  injection pump is removed to perform engine service operations. IMPORTANT FOR PROPER INJECTION PUMP OPERATION  IT  IS  NECESSARY  THAT CALIBRATION AND ADJUSTMENT CHECKS ARE PERFORMED IN SEQUENCE,   AS   OUTLINED   IN   THIS SECTION. NOTE:    Refer  to  individual  pump  calibration  charts  and data   sheets   (at   end   of   this   section)   for   specifications mentioned throughout this section. CALIBRATING STAND A calibration stand with 10 HP or more is recommended. Existing stands of 5 HP are acceptable. When   installing    the    pump    on    the    test    stand    follow instructions furnished with the stand. Figure 1.  Pump on Calibration Stand Calibrating Stand Maintenance The  calibrating  stand  must  be  kept  in  good  operating condition.    Maintenance  checks  and  lubrication  of  test stand   components   must   be   performed   periodically   to assure satisfactory results.  Calibrating oil must be of the specified type.  Calibrating oil and filter must be changed regularly.          Transfer     (supply)     pump     must     maintain minimum     specified     pressure     since     injection     pump calibration    depends    upon    correct    supply    pump    oil pressure. To assure uniform delivery, calibrating stand test nozzles should  be  tested  for  balance  (equal  delivery)  every  six months or whenever 200 pumps have been tested.  The method for balancing the test nozzles is as follows: a. Adjust    all    test    nozzles    to    specified    test nozzle    opening    pressure.        (See    Pump Stand Manual.) b. Install    an    injection    pump    on    calibrating stand. c. Perform    the    "Maximum    Fuel    Delivery Check" and record amount of fuel obtained from No.  1 pumping element. d. Install each of the remaining test nozzles in the No.  1 nozzle position and note delivery from   each   nozzle.      If   necessary,   adjust nozzle   opening   pressure   to   obtain   same flow as recorded for nozzle No.  1 (Step c.). Nozzles must be balanced to within 0.5cm3 per 1000 strokes. e. After  nozzle  balance  (uniform  delivery)  has been  obtained,  recheck  opening  pressure of all nozzles.  If nozzle opening pressure is not  within  specified  limits  (3000    25  psi), nozzle should be repaired or replaced. MOUNTING ON STAND Before  mounting  the  pump  on  stand,  make  sure  pump camshaft   can   be   rotated   more   then   360°.      This   is especially     important     when     the     pump     has     been overhauled. When  installing  pump  on  stand  follow  instructions  with stand. CGES-375 Printed in United States of America Page 1