Something else: You have to either remove the upper stud that the timing chain guide rests on, or pull the front timing chain cover off and remove the guide altogether. Pulling the stud requires a special MB tool that is like a slide hammer with a 6mm bolt, although others have managed to remove it with other expediant means. Myselt, I pulled the front timing cover and replaced the chain tensioner and guides. The timing chain can be removed nearly any time by pulling the top cover, and using a rivet tool to temp rivet the new chain to the old, then rotating the motor by hand and draw the new chain into the motor. When you get it all through, you use the rivet tool and master link to join the new chain together...simple. I'll probalby do it around 200K miles.

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