Now Randy, did you throw me this softball just to allow me to mention Gravely Two wheeled walking tractors which have the same configuration that INDY 500 cars of the 1950 WON so often ? ( Offenhauser )

http://en.wikipedia.org/wiki/Offenhauser

Old Gravely engines had huge valves exactly on opposite sides of the head and long stokes ( relative to the bore ) for high torque at low rpm production .One of our members is a descendant of Ben Gravely.

http://en.wikipedia.org/wiki/Two-wheel_tractor

http://www.youtube.com/watch?v=Y-TqhL41clk

More than 50 attachments were available for them.. here is a mean saw mounted on the front... only four bolts to change most implements..

http://www.youtube.com/watch?v=yIaS6t7pVFI

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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