TM 10-3930-669-34 COMPRESSION TEST (1) Remove  one  glow  plug  at  a  time  in  sequence  (TM 10-3930-669-20). (2) Connect a compression gauge to cylinder. (3) With  the  aid  of  an  assistant  using  retainer,  crank engine and observe pressure gauge. (a) If less than 363 psi (2,500 kPa) is measured, cylinder  is  faulty.    Perform  Step  (4)  and  (5) below and go to Step 5 of this Fault. (b) If   363   to   435   psi   (2,500   -   2,990   kPa)   is measured,    repeat    Steps    (2)    and    (3)    for remaining cylinders.   If all cylinders are OK, fault   not   corrected.         Perform   Steps   (4) through (6) below and notify supervisor. (4) Remove compression gauge from cylinder. (5) Install glow plug. (6) Install cab (TM 10-3930-669-20). 2-15