It has been about a month since my car broke down and I am trying to figure out if my engine failed because of sludge. The only way to find out is if I look in the engine or if I have records of all the oil changes. I don't have all of the records so I want to look at the engine myself if possible. I heard you can tell by looking under the valve cover where the cams are and see how the oil looks. Is it easy to take the valve cover off and if so do I need a torque wrench to torque any of the bolts when putting it back on? Also how do I get to the timing chain to see if that is the problem?