On the Stock Injector Nozzles: "Passages #14 and #15 get Plugged with Carbon. (All of the ones on my Car were so plugged and most of the ones I pulled from the junk were also plugged.)"
http://www.peachparts.com/shopforum/diesel-discussion/299084-monark-diesel-injectors-2.html

See post #6 for a better pic.
http://www.peachparts.com/shopforum/diesel-discussion/390059-monark-nozzles-question.html

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84 300D, 82 Volvo 244Gl Diesel