Pulled Injectors today on my 93, 124, 300D, w/2.5L diesel engine. What I need to know is what function other than to keep dirt away from the injectors is that black plastic sleeve for, p/n 601-017-0150?
Also the 64 $ question is by the injector hole, toward the outside of the head, there is a small hole / port that goes down into the cylinder head. What the heck is that for? None of my service books mention these two things so???????
