Thanks for the reply Larry, The plugs are the pin type and I already removed the fuel rails to facilitate(ha!) the glowplug removal. I also ran this on the tech help forum and Benzmac was kind enough to give his .02 . He said there is a tool to remove the ???injector seat ??? to get at the pre-chamber. Gonna go to the dealer in the AM to check this out, price and all. If any readers know what this tool is I'd appreciate the info.