TM 10-3930-659-34 4-23.  FUEL INJECTION NOZZLE REPLACEMENT (Con’t). b.  TESTING AND ADJUSTMENT WARNING • Carbon removing compound Is a corrosive liquid.  If splashed in eyes, it can cause blindness.  If splashed on skin, it can cause serious burns.  Always wear protective goggles or lenses, rubber apron, and rubber gloves.  If accidentally splashed in eyes or on skin, flush with clean, cool water. Refer to FM 21-11 for first aid information and seek medical attention Immediately. • Diesel fuel is combustible.  DO NOT smoke or allow open flame nearby.  Failure to follow this warning will result in death or serious injury to personnel.  If you are burned, immediately seek medical aid. CAUTION DO  NOT  scrape  or  otherwise  damage  protective  coating  on  fuel  injection  nozzle  body  above carbon washer groove.  Carbon removing compound must not contact fuel injection nozzle body above carbon washer groove.  DO NOT clean fuel injection nozzle body with motor driven brush. Any of these actions will damage fuel injection nozzle. 1. Remove   carbon   from   fuel   injection   nozzle   tip (10)   with   carbon   removing   compound.      Rinse with clean diesel fuel. 2. Clean  fuel  injection  nozzle  tip  (10)  with  a  scrub brush and clean diesel fuel. 3. Test opening pressure of fuel injection nozzle (1) (see   TM   9-4910-409-12).      Opening   pressure must  be  3650-3750  psi  (25167-25856  kPa).    If opening  pressure  is  within  specification,  go   to step 14. 4. Loosen adjusting nut (8) and pressure adjusting screw (9). 5. While    holding    pressure    adjusting    screw    (9), loosen locknut (7) and lift adjusting screw (6). 6. Tighten lift adjusting screw (6) as far as it will go into pressure adjusting screw (9). 4-90