To do this right.....
you need to take out the pistons.... inspect and measure them according to the manual..
put in new sleeves..... and then bore each sleeve to fit EACH piston which is going into it...
These things are detailed in the paper 616 manual ...

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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