TM 9-2815-225-34&P 3-55.  FUEL INJECTOR TESTING; TEST NO. 3 (Contd) LOCATION/ITEM ACTION REMARKS d.  Adjusting and Measuring Fuel Delivery (Contd) NOTE The following instructions are for ST-790 test stand only.  Refer to operating instructions for any other test stand. CAUTION When seating burnishing tool, use care not to push small knob in too hard or overtighten indicator  knob.    Stop  when  slight  contact  is  made.    Damage  can  be  caused  to  injector assembly.  Test stand must be running while burnishing. 51. Burnishing tool (51) Burnish as follows: a.  Turn indicating knob (52) until there is a space 0.375 in. (9.525 mm) from large knob (48). b.  Slowly push small knob (49) in until slight contact is made on injector assembly (39). c.  Turn small knob (49) counterclockwise to lock with large knob (48) and indicating knob (52). d.  Slowly turn indicating knob (52) Do not overtighten. in until slightly seated in injector assembly (39). e.  Index indicator knob (52) with mark on large knob (48). f. Advance indicator knob (52) Check fuel delivery.  After each one mark and back off until four cycles, reclamp injector spaced 0.375 in. (9.525 mm). assembly to ensure accuracy. 3-378