What you are looking for is the pre-chamber removal tool.

Make sure the leak is around the locking ring and not the injector thread -- if it's the thread, you need only new heat shields under the injectors. The injectors are 27mm.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!