I believe we own the same manual: Turbo Diesel 300SD (116.120) USA 1978!
The German mentality was that the local shop REPAIR, not replace. That's
from the time when there were oil cups, grease fittings and adjustments
on many moving parts so that maximum performance could be achieved in
part via fine tuning. Valve and carburetor's adjustments etc.
Labor costs now exceed material and (automated) manufacturing costs so
the local craftsman mechanics have become obsolete (and hopefully have
retired by now).
Testing fuel injectors: reuse if they test OK, otherwise replace. Sounds
like "marketing" to find a sale. You may have your injectors rebuilt at
a Bosch diesel shop; these are usually found in commercial areas. Our
engine's injectors' opening pressure (adjustable inside the injector)
should be between 1958 and 2074 psi. (Page 73)
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