I'm going to try to remove the R4 compressor from my 300cd, "flush" new mineral oil through it, fill it with mineral oil and reinstall (along with a complete flush, new drier and exp. valve) so I can go back to r12 from r-134a. The factory manual doesn't have many helpful pictures and is a bit skimpy on the details. I have a standard and metric wrench set going from 7/8'' to 24mm wrenches. Do I need any special tools, or is a basic socket and wrench set all I need? I also have a 1/2 torque wrench as well. What are the tricky parts of removing and reinstalling the compressor, like the spacers, and belt tension? I have searched all topics relating to "r4" "compressor" etc, and there isn't a definitive pictorial. Diesel giant's A/C page mentions compressor installation taking "hours" due to spacers. Is the compressor r&r job simple enough for a novice with all the necessary tools and equipment to do?

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1980 240d
1999 SL500