TM 5-3805-248-23-2
INJECTOR VALVE AND NOZZLE MAINTENANCE - CONTINUED
0272 00
TESTING - CONTINUED
NOTE
Pressure may start to increase before there is any indication of clear test fluid. To correct this condition,
tighten adapter.
4.
Close on-off valve (8).
5.
Open gage protector valve (7) and pump isolator valve (9) one-half turn each.
6.
Bleed air from diesel injector tester. Loosen bottom of adapter (5). Operate pump until air bubbles are removed and clear
test fluid flows past threads at top of adapter (5).
7.
Test nozzle assembly (2) for pressure loss.
8.
Open gage protector valve (7).
9.
Close pump isolator valve (9).
10.
Adjust gage protector valve (7) until pressure returns to 2,200 psi (15,168 kPa).
11.
Read gage (6) after 30 seconds. Minimum pressure loss is 200 psi (1,379 kPa). Maximum pressure loss is 1,800 psi
(12,411 kPa).
12.
Replace nozzle assembly (2) if test indicates pressure loss outside 200 psi (1,379 kPa) and 1800 psi (12,411 kPa) limits.
Continue testing only if pressure loss is within 200 psi (1,379 kPa) and 1,800 psi (12,411 kPa).
13.
Test valve opening pressure.
14.
Open pump isolator valve (9). Slowly increase pressure until test fluid flows through tip of nozzle assembly (2).
15.
Read gage (6). Minimum valve opening pressure is 2,400 psi (16,547 kPa). Maximum valve opening pressure is 3,100
psi (21,374 kPa).
16.
Replace nozzle assembly (2) if test indicates valve opening pressure outside 2,400 psi (16,547 kPa) and 3,100 psi
(21,374 kPa) limits. Continue testing only if valve opening pressure is within 2,400 psi (16,547 kPa) and 3,100 psi
(21,374 kPa).
17.
Flush with test fluid.
18.
Close gage protector valve (7) and on-off valve (8).
19.
Open pump isolator valve (9). Operate pump three full strokes.
20.
Clean nozzle assembly (2) and adapter (5). Wipe all test fluid off with clean cloth. Dry thoroughly.
21.
Test tip leakage on nozzle assembly (2).
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