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 FUEL SYSTEM
TESTING AND ADJUSTING
INJECTOR UNDER TEST
INJECTOR UNDER TEST
2. Test pressure gauge. 4. Handle. 9. Test pressure
valve.
4. Handle. 9. Test pressure valve. 28. Stopwatch.
NOTICE
1.
Test pressure valve (9) must be in the CLOSED
Look at test pressure gauge (2) during the procedure
position. Use handle (4) to slowly pump the
in Step 3. High pressure can come rapidly, so be
tester and get a pressure of approximately 10
careful. PRESSURE MUST NOT GO ABOVE 14 000
000 kPa. PRESSURE MUST NOT GO ABOVE
kPa.
14 000 kPa.
3.
Pump the tester just fast enough to maintain a
2.
Put handle (4) in the up (released) position.
pressure between 10 000 and 14 000 kPa on
When pressure falls to 7000 kPa, activate stop-
gauge (2). Use a stopwatch and make a visual
watch (28) and check the amount of time it takes
inspection of the injector tip for 30 seconds.
for the pressure to drop to 3500 kPa.
TIP LEAKAGE SPECIFICATION
LEAKDOWN RATE SPECIFICATION
No more than 15 drops can fall from the injector tip within
Injector
Pressure
Acceptable
30 seconds.
Condition
Drop
Time Interval
New or Rebuilt
3500 kPa
30 Seconds Minimum
NOTE: The test fluid must come from inside the injector
Used
3500 kPa
20 Seconds Minimum
through the tip orifice, not from any leakage above.
4.
If more than 15 drops fall from the injector tip in
30 seconds, do not use the injector again. A
repair or replacement of the injector must be
made.
If there is to be a repair of the injector, see
REPAIR OF UNIT INJECTORS in Special Instruction,
Form No. SEHS8190.
VI. Leakdown Rate
LEAKDOWN RATE PRESSURE RANGE
115
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