I will be doing the same thing on my 2.3 in the upcoming few weeks. I need to do this because the tensioner blade has one of the edges broken off and it causes the engine to whine constantly, it's not a plesant sound. I'm also thinking about putting in a new chain at the same time, but once I have the rails and all other plastic guids intact, I can do it without pulling off the timing cover.

xp

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1985 190E 2.3L - a constant project.