Some good advice as always from Roy. If you've never done the timing chain stretch measurement, here is a link to the DIY article.

Begin with step 10 of the DIY. Align the #1 lobe as shown, so the notch on the cam tower and timing chain are aligned. Then take a photo of the harmonic balancer.

Here are the pertinent photos from the DIY, so you know what to photograph.

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-1985 300TD - 324k mi on chassis. MB "Tauschaggregat" 617 motor + 4-speed conversion
Alaska Roadtrip 2009
-2002 E320 Wagon - 197k mi
-1998 E320 Wagon - 310k mi - retired