Hi, no timing marks on cam shaft or crank shaft. Hope this sheds some light, been repairing these engines since they came out. Let me know if you need any explanation, or help. Also, any more details are always appreciated!
Hi, based on information given above with vin, looks like you have a 4.0 SOHC Engine. This engine requires special tools to hold the crank in place, along with the cams in place. The tool for the crank goes on the harmonic balancer, in the notch, and the tool for the cam goes on the squares of the cam shafts, one of the most difficult engines to time if not familiar with the special tools (which are expensive, over 300, even if found used). Basically the way it works, is the machined tools hold the components in the correct spot, to allow removal and installation of the chain/ tensionors. If replacing only front chain guide, you can sometimes sneak it out around the chain, but is not recommended. If you visually look at the the guide, and chain and it looks fine, just replacing the tensionor on top will usually fix the problem, not requiring any timing chain or guide replacement. Chain will "feel" loose when explorer is off. I would try this first to just replace front tensionor, and leave chain and guide alone, There should be an updated tensionor that will stop the "noise on start up" if that is what you are hearing.