1 minute read
Air Fuel Ratio Control
LOAD CELL PRESSURE RANGE
5. The Load Cell Pressure for a new or used injector must be 3100 to 4100 kPa. If pressure is not within this pressure range, do not use the injector again.
IV. External Leakage
INJECTOR INSTALLED FOR TEST 2. Test pressure gauge. 4. Handle. 9. Test pressure valve. 25. Injector.
1. Remove all fluid from the injector holding block, injector body and injector tip with a clean cloth.
2. Close test pressure valve (9). Be sure the injector tip is completely dry.
NOTICE Look at test pressure gauge (2) during the procedure in Step 3. High pressure can come rapidly, so be careful. PRESSURE MUST NOT GO ABOVE 14 000 kPa.
3. Pump the tester just fast enough to maintain a pressure between 10 000 and 14 000 kPa on gauge (2). With this amount of pressure on the injector, make a thorough visual inspection of the injector for any leakage.
4. There must be no leakage at the seals. If there is leakage, new seals must be installed. Make this repair before any other tests are started.
INJECTOR UNDER TEST 2. Test pressure gauge. 4. Handle. 9. Test pressure valve.
5. If there is leakage at any part of the injector (except at the rack hole or from the injector tip), do not use the injector again. A repair or replacement of the injector must be made.
If there is leakage at the rack hole or from the injector tip, do the LEAKDOWN RATE TEST and the TIP LEAKAGE TEST (after EXTERNAL LEAKAGE TEST is complete) to see if the leakage is excessive.
NOTE: If there is to be a repair to the injector, see REPAIR OF UNIT INJECTORS in Special Instruction, Form No. SEHS8190.
V. Tip Leakage
1. Remove all fluid from the injector holding block, injector body and injector tip with a clean cloth.
2. Close test pressure valve (9). Be sure the injector tip is completely dry.
