TM  10-3930-638-24&P 4-3.   FUEL   SYSTEM   MAINTENANCE   (cont) a.  Fuel  Injector  (cont). STEP LOCATION ITEM ACTION REMARKS NOTE Always test performance of a fuel injector before disassembling. If fuel injector tests are satisfactory, there is no need to disassem- ble or adjust. TESTING 1 CAUTION Don’t use motorized equipment or steel wire brushes for cleaning as orifices in body will be destroyed. NOTE Don’t scrape or brush Teflon coating above carbon steel groove. Fuel  injector Clean Remove loose carbon from tip, carbon seal groove and body below groove using brass wire brush as shown 2 Install on Don’t attempt to connect fuel injector inlet test stand fitting directly to standard Ermetro or 60 degree  swaged  type  as  damage  to  tubing can result. Use suitable adapter WARNING Always direct injector tip away from you. Fuel from spray ori- fices  can  penetrate  clothing  and  skin  causing  serious  infection. Always be sure injector tip is enclosed in a receptacle (preferably transparent) to contain spray. If skin is broken by fuel injector spray,  get  medical  attention  immediately. Fuel  injector 4-77