That's a rebuilt injector.
The "367" stamp and the black rubber band (not a true seal) are from the shop that did the rebuild.
Diesel 911 is correct. Most of the time, small amounts of dust - even microscopic - cause the leaks. Cleanliness is the key.
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1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!
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