TM 9-6115-604-34
NAVFAC P-8-633-34
6-17. FUEL INJECTOR TEST.
a.
Leakage Test. Leakage tests are performed using leakage tester 3375375 (Figure 6-18). The leakage tester
should be set up in a dean, well lighted, tightly enclosed area. When a tightly enclosed room is used, float on the
tester may fluctuate if the test room door is opened and dosed. To avoid inaccuracies, readings must be taken
with the door dosed. To avoid inaccurate readings due to vibration, the tester must be mounted on a heavy
workbench. The air supply must be capable of supplying a constant pressure of 80 psi (552 kPa) minimum. The
panel must be mounted in a level position to avoid flowmeter inaccuracy.
(1)
Prepare the tester for use as follows:
(a)
Fin the bawd on the bubble checker (10, Figure 6-18) one-half full with injector test of oil.
(b)
Adjust the screws on the load cell assembly (7) lock to a load of 50 pounds (22.7 kg).
(c)
Install the dial indicator (5) and extension in the damp.
(d)
Install the injector to be tested in the test fixture as follows:
1
Lubricate the packings, and install the injector in adapter pot 3375440 (5).
2
Install he 3375398 injector link (15) in the injector plunger.
3
Place the adapter pot locator (16) over the injector with the largest diameter toward the injector
flange.
4
Install the assembly in the tester with the injector link in the load cell assembly (7), and the cup in the
nose piece (14), and secure it in place with the damp (4).
5
Install the supply and drain hoses on the adapter pot (5).
(2)
Cup-to-plunger test.
(a)
Adjust the air pressure to 60 psi (414 kPa) using the regulator knob (3).
(b)
Adjust the hand crank (8) to show 200 pounds (90.7 kg) on the load cell gage (1).
NOTE
To avoid blowing oil from the bubble checker, the air supply valve (11) must be off when
turning the other valves (12 or 13) either on or off.
(c)
Turn the tip seat plunger leakage valve (12) to ON.
(d)
Turn the air supply valve (11) to ON, and check for bubbles in the bubble checker (10).
(e)
If no bubbles appear within 10 seconds, or if the time between bubbles is more than 5 seconds, the cup-to-
plunger seating is acceptable.
(f)
If the cup-to-plunger seating is unacceptable, replace the cup.
(g)
Before proceeding to the next test or removing the injector, turn the tip seat plunger leakage valve (12) to
OFF, then turn the air supply valve (11) to OFF.
(3)
Barrel-to-plunger test.
(a)
If removed, install the injector in the leakage tester in accordance with step (1), above.
(b)
Check that the air pressure is still set to 60 psi (414 kPa). Adjust as necessary using the regulator knob
(3).
(c)
Adjust the hand crank (8) to show 200 pounds (90.7 kg) on the load cell gage (1).
(d)
Zero the dial indicator(6), and back out the hand crank(8) 0.047 inch (1.19 mm) as shown on the dial
indicator.
(e)
Turn the tip seat plunger leakage valve (12) to ON, then turn the air supply valve (11) to ON.
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