I am replacing the the valve cover gaskets on my SL. Other than the obvious removal of the air cleaner assy. and sparkplug wires, what else needs to be removed? I was noticing a 3/4 inch diameter plastic hose that sits right up against both valve covers. It's not fuel, it appears some type of air delivery. Do these hoses need to be removed?
I will clean the living daylights out of the top of the engine before I attempt to pull the covers.
Any tips and how to's would be greatly apppreciated.
The car is laid up for a few days while I wait for a new radiator to show up. I figured that while I have radiator out I would change the belts and replace the valve cover gaskets.

Oh another question. How do you move the A/C compressor to get the belt off. I figured everything else out, but I can't for the life of me see any adjustment bolt for the compressor. I did notice the stand alone pulley above and to the left of the compressor but I couldn't lossen it up to get some slack in the belt.
Any tips on this as well would be appreciated.

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1999 MB SL500 (110,000 mi)
2004 Volvo V70 2.5T (220,000 mi)
2014 Tesla Model S 85 (136,000 mi)
MBCA member