I was wondering if maybe it could be just a bad ring.

I had all 5 injectors tested and they were given a green light by the tech doing the testing. So I think it was okay.

Beagle,
I was told that this ring is the "new" one by both Mercedes and Fastlane. The old 10mm ring was replaced with this 7.5mm supposedly. My opening in the prechamber is 10mm so whatever metal is inside this is just hanging out so the seal that can be made to the injector around the pintle is minimal at best due to teh fact that the crush ring is not being crushed against the prechamber seat. I thought this odd but will look into it further.

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'99 S420 - Mommies
'72 280SE 4.5 - looking to breathe life into it
'84 300SD Grey - Sold
'85 300SD Silver - Sold
'78 Ski Nautique