The timing chain tensioner is vital to maintaining not only proper timing, but the life of the chain itself. Generally these will need to be replaced before the chain itself goes bad. Be sure to change yours at the proper intervals to avoid failure.
The guide rails in your timing set keep everything tracking properly. Because it is made out of a plastic-like material, years of abrasion can wear parts of it away. This can cause the chain can to become slightly loose and cause a chain 'slap' or rattle noise. Replace your damaged timing chain tensioner and guide rails to keep timing chain noise to a minimum. Located on the outside of the timing chain guide that keeps tension on the chain.
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