Part number: MER-1209930420 is a new, unused Genuine Mercedes engine timing chain tensioner. Timing chains are like timing belts in that they keep the major components of the engine's combustion cycle in sync. Timing belt tensioners and timing chain tensioners perform the same job of keeping the chain/belt at the right tension. If the timing chain tensioner fails there is a high risk of chain failure, this it should be replaced immediately.
Genuine Mercedes parts represent the best value in Mercedes parts. When you consider the quality, price, and lifetime that you get from the part you quickly realize there is no substitute for Genuine Mercedes engineering
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