After any change in the chain be sure to reset your IP timing. The FSM method of using one drip per second is good because it is a bottom line measurement... wear on parts may be cumulative... or may counteract each other... the one drip deals with the reality of the moment for the setting...

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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/showthread.php?t=156207&highlight=evaporator

A/C thread

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