http://en.wikipedia.org/wiki/Leak-down_tester

NOTE WARNING :
" An engine pressurized to 100psi must be locked at exactly top dead center or it will rotate under the pressure. This presents a serious DANGER to the operator. Using less pressure is less dangerous and opens the possibility to test at positions other than top dead center.

Due to the simple construction, many mechanics build their own testers and those instruments function perfectly well."

http://osdir.com/ml/culture.cars.volkswagen.diesel/2003-08/msg00161.html

http://www.westfalia.org/community/showthread.php?t=195

http://www.carcraft.com/techarticles/116_0406_cylinder_leakdown_tester/index.html

http://www.carcraft.com/techarticles/ccrp_0406_how_to_perform_a_leakdown_test/index.html

All these agree that 100 lbs is plenty... some suggest less can even be effective...

This guy did not like the HF tester:
http://weldingweb.com/showthread.php?t=38847

__________________
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