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 guide rail to keep timing chain noise to a minimum.

Be sure to check out all of Euromotiv's Timing section to pick up any other guide rails or chains you may want to replace. Or pick up the Complete Timing Chain Kit for a whole set of tensioners, chains, and guide rails for your engine.