Injector protective cap while working on engine?
https://www.ebay.com/itm/Auto-Car-Pa...YAAOSwAfVdr8FR
You might also use something like a food wrap as long as it's clear of diesel fuel.
As a matter of fact I did the work in my garage and I didn't cover the injectors. I made sure the area was perfectly clean and there's no possibilities of debris falling in the engine compartment, and I made sure to thoroughly clean all parts upon removal/installation. The engine was put back and now it's been about 1000 miles so far so good. The biggest challenge is that you don't want to use air gun to blow the area if they are not covered.





