Good day

I have a 1993 300D 2.5L Turbodiesel with over 200k

It has begun leaking around the area of the prechamber of cylinder #5

I ordered a splined wrench for prechamber collars for this engine

My local auto parts is no help for finding anything without part numbers

Anyone know the threaded ring part number?

Any suggestions or tips for diassembly and reassembly.

Any help would be appreciated

Thank you

Tony