I love that engine.. it will really perk up with the Redline Weber 32/36 carb on it. That is a pushrod engine used by many experimental aircraft people due to being ' bulletproof'... It is the VW air cooled 4 engine with the 7 major faults fixed.. due to the hiring of the former head of VW. It is smaller and lighter than the air cooled engine with twice the hp stock... meaning AC can be run on it down here in the south.

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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