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The guide rails in your timing set for your engine keeps everything tracking properly. Because it is made out of a plastic-like material, years of abrasion can wear parts of it away. The chain can get a little loose and cause noise in the chain. Replace your rail with a Genuine BMW replacement part.
Made from the same material and to the exact specifications as the original part, this replacement chain guide rail will keep everything on track and tight. A factory identical replacement part.
