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Old 12-13-2002, 01:19 PM
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Thomaspin Thomaspin is offline
Join Date: Jun 2001
Location: CA
Posts: 531
Chain rail replacement illustrated

This piece I wrote recently may help with the chain rails - it's on my 1990 560SEL - yours should be pretty similar, but check that you get the right parts as I am unsure whether the 420 uses the same rails.

I did not replace the chain as I had only 5 degrees of stretch at 100,000 miles.
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