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Hello Everyone. I own a ML350 2006my, 187650miles. I want to know the signs of timing Chain failure. Mine has never been changed and I am experiencing some strange noise whenever I start the engine in the morning.
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W163 Crash Test Driver
2008 ML350 (Me!), 2010 GLK350 (Wife), 2003 ML-350 (Deceased)
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Is it a kind of rattling that lasts about 2-3 seconds right after startup? If so, MB considers that "normal". I have found that my ML350 rattles on startup anytime the oil is less that at the full mark. When it does, I top it off and the startup rattle stops. Your mileage may vary.

Now, if you have some other kind of noise that lasts for an extended period of time, that's different. Could be the timing chain tensioner.
 
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