Originally Posted by Diesel911

Bosch certified does not mean the people in the shop are Bosch trained.

When I started working my first diesel mechanics job which was in a fuel injection shop rebuilding Injectors is the first thing you are shown how to do because it is fast to show you and they can state making money off you fast.

If you have moderate intelligence, they only have to show you how to do a few complete from teardown to finished injectors to teach you. What takes time is telling if the spray pattern is good or not.

You often end up with some nozzles having a only marginally good spray pattern even with new Bosch nozzles.

The other test you bring the injector up to 200 psi before the opening pressure is reached and X number of drops are allowed to weep out drops and it is still considered good nozzle.
You go to your boss and say you have a couple of nozzles that are X+ drops meaning if you are strict the nozzles did not pass. And the Boss may take a look but normally you are going to hear that the Customer wants their Injectors back so that they can resume making money off of their equipment. And those deficient nozzles go to the customer.