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Mercedes switched over to hydraulic lifters by the time your car came out, so there is no manual adjustment for the valves.
My 1987 300D has a little valve noise too when cold, and it goes away after the engine warms up. Not enough of an issue for me to go to the trouble of changing out any lifters. If they make noise even after the car has warmed, then it might be time to take some action.
Ken300D
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1982 300D at 351K miles
1984 300SD at 217K miles
1987 300D at 370K miles
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