It might be easier to use the broom handle trick one end against engine, other end on your ear, using like a stethescope) to locate the cylinder you hear the knock coming from!!!! Then throw in a junkyard injector, or two, until you find one that works without knock/nailing.
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1983 300D, the "Avocado"
1976 240D, 4-spd the "Pumpkin", SOLD to Pierre
1984 190D, 2.2L, 5-spd, my intro to MBZ diesels, crashed into in 2002
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