Been working on a problem with rough idle and low power in the 1995 E300D. When cracking the injector lines, one cylinder did not effect the engine speed; cylinder four. I got new Bosio nozzles for them and while I am unable to get the Injector body apart right now, I took some photos:

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1987 300TDT - 195,000 (Original #14 head)
1993 190E 2.3 - 105,000
1981 300D - 250,000

How to Rebuild Injectors
vincewaldon.com - HOW-TO: Rebuild Diesel IDI Injectors

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84 300D, 82 Volvo 244Gl Diesel