You have to take the injectors to your local tractor repair shop or your local diesel shop and have them test the injector pop off pressure with a pop tester-then correct any that are out of spec with varying shim thicknesses inside the injectors between the spring and the nozzle.

Google "injector pop tester" and you will see what they look like and how to buld your own if you want.

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This was done at my place:
- commercially rebuilt injectors that fail the pop test!
That is the way I received them-I have yet to fix them,but will someday.