I have a 1977 MB 300D and I took the injectors out for servicing. I can not seem to get the heat shield (crush) washers out of the prechambers. I've done this job at least 3 times on a 79 240D usually without any problem. (I have a great bent pick for getting them out.) After closer inspection it seems to appear that the hole under the injector is all one piece, nothing will budge, have cleaned them up and can't seem to find a seam anywhere. Also, when I thread the injector back in there are no threads showing above the pre chamber. On my 240D I can see a bit of thread and the 300D injectors, when I put them back in seem to seat deeper. Is it possible that there were no crush washers in there? The Prechamber seat (where the injector seats) has a bit of a profile (slightly raised centre)but does not appear to be the same profile as what the top of my crush washers look like .

Basically the new crush washers have a 1/16 to 1/8 raised ring on the outside edge and the existing injector seats do not . However the centre is raised on the existing seat as is the crush washer.

I really can't tell if there were any in there? Any advice?

I am really leaning to the fact that there were none or this engine is different than my 240D and doesn't need any?

Any Help greatly appreciated!!!

Will

1979 240D 340,000 KM 60,000 on WVO Trusty but Rusty!
1977 300D 249,000 KM Awaiting conversion