1999 E300 Turbodiesel

This will be my first time doing a R&R of a fuel injector, I have replaced many spark plugs over the years so the concept is not new to me.

What I plan on doing is removing the hard injector retainers to provide more room to move the hard lines aside. I expect them all to be brittle and break and have new ones on hand.

Next I will loosen and remove the nut holding the hard line to the injector.

Removing the braided fuel return lines is a bit unclear. Are they slightly heated or simply reefed on till they come off? Any special techniques as I believe they will be really stuck on.

I have a 22MM deep socket to remove the injectors. Is it best to do remove the injectors on a hot, warm or cold engine?


I plan on moving the hard line only enough to get the socket on the injector.

I will cover the holes with paper towels to keep dirt out.

I will then have them cleaned, rebuilt and pop tested by a local shop. I have new heat shields and believe that the rebuilt injectors should be torqued 50 to 60 foot pounds.

What pressure should the new Bosch Nozzles be set to pop at?

Any tips or techniques that can make this job easier? I am cautious and a bit concerned about doing this for the first time.

Thanks

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1999 Mercedes E300TD daily driver sold at 238K miles 106K miles were mine, rust worm got it :-(
2006 Mercedes CDI new daily driver! 56,000 miles May 2016 now 85,625 Apr 2018 and Apr 2019 101,000 miles Apr 2020 109,875. March 2024 135,250, Dec 2024 145,000 miles