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TM 5-2420-222-34
5-1.
FUEL INJECTION NOZZLES TEST AND REPAIR (Con’t).
8.
Tighten lift adjusting screw (1) on pressure
adjusting screw (3) until snug, then loosen two full
turns.
9.
Install fuel injection nozzle (5) with assembled parts
in nozzle holding fixture and vise.
10.
Tighten adjusting nut (4) on fuel injection nozzle (5)
and pressure adjusting screw (3) until snug. Ensure
that pressure adjusting screw does not turn.
11
Install locknut (2) partway on pressure adjusting
screw (3) and lift adjusting screw (1), then remove
fuel injection nozzle (5) with assembled parts from
nozzle holding fixture and vise.
NOTE
The following check must be
performed during assembly to
ensure proper operation.
12.
Install fuel injection nozzle (5) with assembled parts
in diesel fuel injection nozzle tester (see TM 9-4910-
409-12).
13.
Hold lift adjusting screw (1) with wrench to prevent
turning. While pumping fuel through fuel injection
nozzle (5), tighten lift adjusting screw until valve (9)
no longer opens.
14.
Check for valve bottoming by increasing pressure to
200-500 psi (1379-3448 kPa) above fuel injection
nozzle opening pressure. Some diesel fuel may
collect at nozzle tip (6), but a rapid dribble should not
be present. If excess leakage is present, replace fuel
injection nozzle (5).
15.
Hold pressure adjusting screw (3) with wrench to
prevent turning. Torque locknut (2) to 35-45 lb.-in.
(4.0-5.1 N•m).
16.
Hold pressure adjusting screw (3) with wrench
prevent turning. Torque adjusting nut (4) to 70-80
lb.-in. (7.9-9.0 Nom).
17.
Repeat test and adjustment (see subparagraph
a).
FOLLOW-ON TASKS:
Install fuel injection nozzle (see TM 5-2420-222-20).
TA701A322
5-8
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