It seems to me you are worrying about an effect that will be taken care of by the chain tensioner. When you took the old one out, the exhaust cam was free to rotate toward the intake cam, and it did, slightly. You can probably manually push it back (there are some flats behind the camshaft sprockets that you can get a Cresent wrench on and turn the camshaft as far as the chain slack between the two sprockets will allow), or, you can start the car and the oil pressure will apply a load to the chain tensioner so it tensions the chain. Once the slack between the two sprockets is gone, with the new chain tensioner, it stays gone. The old ones would allow slack, as you describe, once the oil pressure decayed after shutting down the engine. As the chain stretched over time, this became a bigger and bigger problem. Thus the new chain tensioner with the mechanical ratcheting feature. Good luck, Jim

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Own:
1986 Euro 190E 2.3-16 (291,000 miles),
1998 E300D TurboDiesel, 231,000 miles -purchased with 45,000,
1988 300E 5-speed 252,000 miles,
1983 240D 4-speed, purchased w/136,000, now with 222,000 miles.
2009 ML320CDI Bluetec, 89,000 miles

Owned:
1971 220D (250,000 miles plus, sold to father-in-law),
1975 240D (245,000 miles - died of body rot),
1991 350SD (176,560 miles, weakest Benz I have owned),
1999 C230 Sport (45,400 miles),
1982 240D (321,000 miles, put to sleep)