IN ADDITION to that....

Many people see that Power Steering nut and think " so much easier than getting to the Crank Nut "....

Also a terrible idea Specifically Forbidden in the Factory Shop Manual....

The reason ? That power steering shaft and that pulley are a taper fit... thus.... applying too much force... which by definition is the amount required to turn a 21 to 1 compression engine.... spreads that pulley's insides... makes it an interference fit.... and will cause you all sorts of heartaches if you have to take it off to work on it....and might cost you a new power steering pump also...

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/diesel-discussion/156207-photo-step-step-post-showing-w123-evaporator-removal-1983-240d-1982-300td.html?highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html