It is one of those things which warms my heart.... since I hate electricity due to it being invisible.... the idea that once running we are strictly mechanical is like having a built in survivalist in the glove compartment.... a genie who can get you home to your own tools.... or the local trusted mechanic... or just to a warm bed until you are forced to deal with whatever else needs to be done ... SCORE !!!!

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/diesel-discussion/10414-help-i-need-check-stretch.html

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