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Old 11-04-2001, 05:10 PM
CloudNine CloudNine is offline
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Join Date: Dec 2000
Posts: 65
Question 560SEC Timing Chain and Guides ready to replace?

Greetings All!

My '89 560SEC runs well, and I am a happy camper every time I slide behind the wheel.

Having 129,000 on it, and reading up on the subject, I have to ask about the timing chain, guide and tensioner.

Depending on who you ask, the guides are:

a) composite, and last a long time with no trouble; or

b) plastic, and become brittle with time and can cause the engine to self-destruct.

I had the passenger side valve cover off, and everything looked good. The two guides that are visible appeared to be a darkened with age, but otherwise appeared intact.

Also depending on who you ask, the chain is:

a) good for another 20,000 miles; or

b) overdue for replacement.

Again, the duplex chain looked good.

Is there any objective way to resolve these issues? What is the official MB position? Is that realistic?



'89 560SEC
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