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3-4 INJECTOR BACK LEAK TEST( DYNAMIC)
INJECTOR BACK LEAK TEST (DYNAMIC)
1) Remove the return hose from each injector and Install injector return hose adapter
visible tubes flasks and injector return hose plug
referring to Injector back leak test (STATIC) in previous page.
2) Conduct the high pressure leak test referring to following explanation.
BOSCH Type Ⅰ,Ⅱ,Ⅲ : D3EA(1.5D-ENG), D4EA(2.0D-ENG), D4FA(U-ENG), D4CB(2.5A-ENG)
3) Start engine → 3 minutes at idle → accelerate engine up to 2500 rpm and keep the 2500rpm for
2 minutes →Stop Engine after 2 minutes
4) When the test is completed, measure the amount of fuel in each flask
5) Judgments
BOSCH Type
Replace the injector which is shown more 3 times than the minimum value.
Normal condition
1
2
3
4
DELPHI Type
3) Connect the Hi-Scan and select the 'High Pressure Leak Test' mode.
4) Conduct the 'High Pressure Leak Test' until the Hi-Scan finish the test automatically.
or manually : Start engine → 2minutes at idle → 3 times acceleration →Stop Engine
5) For the accuracy of the test, perform the test more than twice and select
the largest amount as a measured value.
※ The flasks should be empty before the 2nd test started.
6) Judgments
DELPHI Type
Replace the injector which indicates exceeds 25cc.
Service Limit 25cc
1
9
＃2 Injector abnormal
1
2
3
4
Start
2
3
4
Abnormal
injector
30sec / 3000rpm
30sec / 3000rpm
1min
stop
Start
2min
Stop
Idle
acceleration
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