injector nozzles
Cannot vouch for Lycoming, or Precision
"To install the nozzle body; remove the restrictor and apply a small amount of anti-seize compound to the pipe threads on the body. Install the nozzle with a clean 1/2" deep socket (a 1/4" drive, 6 point deep socket works well) to tighten the nozzle. Make sure the hex is broached far enough into the socket so it will not damage the nozzle shield. Torque the nozzle body to 40 to 60 inch pounds. If the nozzle will be installed in any position other than vertical (discharge end down), tighten the nozzle to 40 inch pounds first then check for the position of the "A" stamped on one of the hex flats on the body of the nozzle. Continue to tighten the nozzle until the "A" points downward within a tolerance of one flat of the hex of the nozzle body. Do not exceed the maximum nozzle torque value when positioning the "A". This will position the air bleed hole in the body of the nozzle to face upward, and tend to keep fuel from dripping out the air bleed hole after engine shut down. Reinstall the fuel restrictor into the nozzle body before attaching the nozzle line. Torque the nozzle line B-nut to 20-25 inch pounds or seat the B-nut finger tight then tighten the B-nut an additional one-half flat."
Hope that helps.
Don