The threads don't do the sealing (they're not pipe threads) so Teflon tape isn't the answer. The leaks sound like they are between the prechamber and the head or between the injector body and the prechamber. Given the pressures in a diesel combustion chamber, cleanliness of the sealing surfaces is critical. Use fine steel wool to polish the points where the injector meets the prechamber. Don't disturb the prechamber if it hasn't been recently removed from the head; it's probably OK. Suck out any debris with a vacuum cleaner. Re-install the injector with a new seal -- never try to re-use an injector seal.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .343,000 miles Wife's car
2005 E320 CDI . . 148,000 miles My car
Santa Rosa population 177,300 (2026 projected)
Total. . . . . . . . . . . . 668,300
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970