TM 9-2815-237-34
2-37. FUEL INJECTION NOZZLE REPAIR (Cont’d)
3. Leakage test.
(a) Open shutoff valve to pressure gauge one additional turn.
WARNING
Compressed air used for cleaning purposes will not exceed 30 psi
(207 kPa). Use only with effective chip guarding and personal
protective equipment (goggles/shield, gloves, etc.).
(b) Blow-dry end of nozzle (2).
NOTE
A pressure of 1,400 psi (9,653 kPa) must be maintained for
10 seconds while checking for nozzle leakage.
(c) Depress lever on tester until pressure gauge reads 1,400 psi (9,653 kPa) and observe tip
of nozzle (2). If a droplet forms and drops off the nozzle (2) in 10 seconds or less, replace
nozzle (2).
4. Chatter test.
(a) Close shutoff valve to pressure gauge.
(b) Depress lever on tester slowly, noting whether a chattering noise can be heard.
NOTE
Faster lever movement may cause nozzle to hiss or squeal rather
than chatter; this is acceptable.
(c) If no chatter is heard, increase speed of lever movement on tester until nozzle (2) chatters.
If no chatter is heard, replace nozzle (2).
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