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1- Only use the MB factory service manual. Forget Haynes. End of discussion.
2- The 603 does NOT repeat does NOT have a ratcheting tensioner. It is spring loaded and fed with oil pressure but doesn't have a detent like the older OM61x engines did. The 603 tensioner requires no resetting.
3- Yes the rattle noise could likely be the belt shock. They have a frighteningly short lifespan and make one hell of a racket when the bushings fail. At idle with the noise present, press on the side of the shock body and see if the noise goes away (use a screwdriver or broomstick if you're nervous about sticking your fingers that close to the fan.)
4- All the cars have a catalyst in the exhaust. The "trap" refers to the "trap oxidizer" which was only used in 1986/87 and has been recalled. The proper name for the new part, used on 90-up models, is "oxidation catalyst" - not "trap catalyst".
5- I agree, don't dink with the ALDA if the engine is already running well, and the 0-60 time is near factory spec. MB only recommends a 1/4 turn, not 1.0-1.5 turns, btw (although usually it does require more than 1/4 turn to revive an IP that's low on fuel delivery.)
HTH,
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