If you are not familiar with these Diesels, their normal sound can be falsely concerning. It's going to make some klickity klack even running 100% normally. Then again, there is a point where it is a concern but I see people chase noise issues and there is nothing abnormal. A video with good audio would help.

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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors.
2003 S430 - 107K
1983 300SD - Tanoshii - mostly restored ~400K+.
1983 300SD - Good interior. Engine finally tamed ~250K.
Monark Nozzle Install Video - http://tinyurl.com/ptd2tge