I have a couple of comments to add.

I don't believe that the clip-type master link reduces the strength of the chain. The strength is determined by the pin and side plate strentgh. This is a question of reliability and I firmly agree that the crimp-type master link is more reliable than a clip-type.

There is another mode of failure for the e-type clips that wasn't discussed. The clips can actually spin on the pins due to vibration and wear the pin away. I have never used e-clips on a timing chain, but I have had this failure mode with other applications of e-clips.

Finally, there is a type of chain known as a "true roller" where the rollers are machined bearing surfaces, not the split rollers like shown in the picture. True rollers are quieter and roll on the chain wheels, which reduces friction and wear. I am familiar with them from small block Chevys, but is there a choice for a "true roller" versus split roller for MBZ? If so, the choice is obvious. I didn't even think to check which type of chain it was when I replaced the one in the 300E.

Your missing roller could be smashed on either the crank or cam gear. It's worth a look.

__________________
D.H.

04 ML500
02 E430

Experience is something you don't get until just after you need it.