Pentoman Said: I am approaching 100,000 miles on the old 1986 M102.. chain/tensioner time yet?
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Since the engine is now 19 years old and most MB experts say the chain and related parts should be replaced at 100K miles and/or 10 years.....I'd say you are ready now. If the plastic guides fail and a piece gets into your chain and you jump time.....then be ready for major engine work. The plastic guides are white color when new....and when old they become dark brown and fragile. Better get the job done soon.

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1986 560 SEL (159K miles)