FUEL INJECTOR MAINTENANCE - CONTINUED
Cleaning compound, solvent MIL-PRF-680 Type III is an environmentally compliant and low toxic mate-
rial. However, it may be irritating to the eyes and skin. Use protective gloves and goggles. Use in well-ven-
tilated areas. Keep away from open flames and other sources of ignition.
Rinse nozzle with solvent (WP 0316 00).
Inspect needle tip for roughness or erosion. Note that rough machined appearance is normal for pressure shoulder.
· Keep clear of test spray from nozzle. Fluid at test pressures can penetrate skin, causing infection and possi-
· Eye protection must be worn when performing maintenance where components or particles could fly out
during procedure. Failure to take precautions could cause injury to personnel.
· Some components are under spring tension. Wear eye protection and use caution when disassembling them,
to avoid injury.
Connect injector to fuel injector test set.
Open valve and operate pump lever at a rate of one
stroke per second while observing test pressure gauge
Spray must begin at a pressure of 3,553 +/- 73 psi
(2450 +/- 503 kPa).
If spray does not begin within pressure
range specified in step 4, change thickness
of shims. Adding shims will increase
opening pressure. Remove shims to
decrease opening pressure.
Check for well-atomized spray pattern.
For leakage test, use same test set up for opening pressure test.
Open valve on test set.