That's a good point ^ . If you here a rattling from the front of the engine for the first 10 or so seconds after startup (especially on a cold start) on the 22r family of engines, the timing chain is either rubbing the chain guide, or wearing the aluminum cover. They really aren't hard to change out and can, in many cases, be an excellent bargaining point for an item that should be part of base-lining your new rig.