TM 1-1500-204-23-1 (b)   Fuel nozzle cleaning Clean fuel nozzles using the following procedures WARNING Dry-cleaning    solvent    Is    flammable and solvent vapors are toxic.  Use P- D-680     Type     Solvent     in     a     well- ventilated   area.      Keep   away   from open flames Avoid prolonged solvent contact with skin. 1 Clean using dry-cleaning solvent and a brush 2 Remove   residue   with   a   clean lint-free cloth WARNING When     using     compressed     air     for cleaning,    use    approved    protective equipment for eyes and face.  Do not use  more  than  30  psig  air  pressure. Do  not  direct  air  toward  yourself  or another  person.    Failure  to  comply could result in injury to eyes or skin. In     case     of     injury,     get     medical attention. 3 Blow    filtered,    compressed    air through  primer  nozzle.    Hold  nozzle  tip  In  water,  and look for stream of air bubbles coming from orifices.  The nozzle   is   clogged   if   there   is   no   bubbling.      Replace nozzle if clogged. (3)   Main    fuel    filter    inspection    and    cleaning. Inspect and clean main fuel filter in accordance with the applicable    maintenance    manual    and    the    following paragraphs. (a)   Main  fuel  filter  inspection.    Inspect  the main fuel filter for cracks, corrosion, pitting, and element contamination. (b)   Main   fuel   filter   cleaning.      Clean   filter with   a   cloth   dampened   in   dry-cleaning   solvent.      Dry using compressed air. WARNING · Dry-cleaning solvent is flammable    and    solvent    vapors are  toxic.    Use  P-D-680,  Type  II Solvent  in  a  well-ventilated  area. Keep   away   from   open   flames. Avoid  prolonged  solvent  contact with skin. · When  using  compressed  air  for cleaning, use approved protective    equipment    for    eyes and  face.    Do  not  use  more  than 30   psig   air   pressure.      Do   not direct  airstream  toward  yourself or   another   person.      Failure   to comply  could  result  in  injury  to eyes or skin. (4)   Fuel  control  filter  inspection  and  cleaning. Inspect  and  clean  fuel  control  filter  in  accordance  with the  applicable  maintenance  manual  and  the  following paragraphs. (a)   Fuel   control   filter   inspection.      Inspect filter for tears, punctures, broken wires, dents, scratches, and corrosion. (b)   Fuel  control  filter  cleaning.    Clean  filter using the procedures In paragraph (3)(b) (5)   Governor control inspection and adjustment. Inspect  and  adjust  the  governor  control  in  accordance with the applicable maintenance manual. 8-7.          Replacement     Criteria     for     Engines     and Components.    Replacement   criteria   for   engines   and components are explained in the following paragraphs: a Engine   Replacement   Criteria.      The   following conditions require replacement of the engine: · When scheduled replacement time Is accumulated, as specified In the specific engine maintenance manual · When    foreign    objects    enter    air    Intake    and damage compressor. · When overspeeding occurs, inspection or replacement shall be as indicated In the specific engine maintenance manual 8-19