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???????

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Den
1993 MB 300D 2.5
2001 VW Jetta TDI 5 spd.
2001 new bug TDI 5 spd.
Motorcycles

WHAT?

Please let me know if and when you find out!
'90 124128/w.602

Black plastic sleeve? Do you mean the prechamber?

Are you sure you're not missing a cylinder head bolt?

Sixto
95 S420
87 300SDL

After I un-torqued the injectors and removed them and was removing the heat shields / seals / crush rings / I think I've covered everything they call them, anyway taking these out with a magnet, there is this black plastic sleeve like part, w/ p/n 601-017-0150 and a marking of 180 Deg. on the outside edge of them. They slide down into the outside edge of the injector chamber before the injector is inserted. Must be a dirt catcher or maybe just a heat shield of some kind.
Also these holes in the cylinder head are just outside of the injector chamber toward the outside of the cylinder head and are quite small and not round, maybe 5 or so mm wide. Looks like some type of a casting mark or whatever.
Will post my findings. On the way to get my jectors re-built.

__________________
Den
1993 MB 300D 2.5
2001 VW Jetta TDI 5 spd.
2001 new bug TDI 5 spd.
Motorcycles

D Black plactic sleeves are, drum roll, dust shields, duhh, well that is what MB calls them.
Still do not know what the holes are.
Injectors are being cleaned for testing then ?? re-building.

__________________
Den
1993 MB 300D 2.5
2001 VW Jetta TDI 5 spd.
2001 new bug TDI 5 spd.
Motorcycles

Thanks!
I looked at mine ("Dust Shields"???) as soon as I saw your original
post.Tiny little half moon insets (in the circumference of the injector
opening)in which a little matching extruded rubber flap is aligned to
match up with.
I cannot find the "opening into the head".(Difference vis-a-vis '92-'90)

If you are not already aware, please be advised BEWARE parts or
complete rebuilds from India (I.E. pintles from India when viewed under
microscopic show GROSS defects) NO PRODUCTION Q.C.!

Sorry, I put some info on the cylinder head on my door lock problems page.
Have not recieved the injectors back as of this writing.

__________________
Den
1993 MB 300D 2.5
2001 VW Jetta TDI 5 spd.
2001 new bug TDI 5 spd.
Motorcycles