After much reading, and procurement of the engine manual, essential tools and the necessary parts, I started the job on my 560SL with 80K miles. The car has been well-maintained all it's life, including 3000 mile oil changes, and things look pretty good with the air cleaner, spark plug harness and right camshaft cover off. Very clean, camshaft is nice, and nothing looks out-of-ordinary. The upper guide on this side is amber in color and the plastic cam oilers are almost black. I will be replacing both. I removed the spark plugs and rotated the engine to line up the marks on the camshaft. The timing mark on the crankshaft says 4 degrees past TDC. Should I replace the timing chain now or leave that for a future project? It took about an hour or so to get to this point, so it's not real significant a time savings to "do it now". What do you guys think? Do I need to check the alignment mark on the left side? I also purchased a new Febi chain tensioner, and I will be putting that on after the guide rails are replaced on both sides. I got the "screw-type" guide rail pin puller from ZDMAK. Next thing will be to remove the cruise control actuator and the alternator with bracket. I got a bit nervous when I saw the Allen-head socket head bolts holding on the alternator bracket, but with my 6mm Allen socket and various wobble extensions I managed to break them loose...whew! Nice to have a car that's not rusty! I now need to release the belt tension. Hopefully will get to the next step it in the next few days.