You got some grit or something on the seal surface of the injector that is leaking. Take it apart again and flush it with some spray cleaner and re-assemble. Doesn't take much on that steel-to-steel seal to leak -- pretty high pressure in there.

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!