Just finished my front end rebuild. I replaced shocks with Bilstein HDs (rear too), guide rod mounts,upper and lower control arm bushings, upper and lower ball joints, steering shock, drag link, tie rods, steering coupler, and idler arm bushing.

Had a shop do the pressing work, I did the R&R. Not difficult, just make sure everything comes out and goes in, in order.

Now my torsion bar bushings are making all kinds of noise. I wish I'd have thought of them before doing everything else. Ugh.

For just the noise... look for Muratic acid...
this was available in a gallon container with just some at the bottom.. to which you add water to get the proper %.
Standard rubber lubricant ....
Ru-glyde

https://www.napaonline.com/en/p/BK_7651338

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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