Every w123 Ive owned has this. How have others fixed it?

I asked around, you need the right foam to prevent corrosion and harm to the pipe. HD has the right closed cell foam - Armacell Armalite AP. $3.97 for about 6ft.

I want to bond it to the metal, so there is really no space for moisture to exist under there.

Should really help prevent heat pickup sitting so close to the valvecover.

This is the stuff:

http://www.armacell.com/www/armacell/armacell.nsf/ansHTMLSeitenLookUp/USA-TI_Frame?OpenDocument

Any comments? Anyone work another solution?

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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)

I just zip-tied on some standard foam pipe insulation from Home Depot five years ago. Seems to be doing the job (still looks brand new, even). I don't know exactly what that line is made of (something brasslike?) but I don't think plain water should corrode it at all; I've certainly never noticed anything like that. But then, I live in SoCal and it's pretty dry here, so your milage may vary...

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'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)

When I got my car, the foam was completely gone. You could see some sort of glue residue here and there. I am also using zip tied stuff from Home Depot. I do have to replace the zip ties about every two years as they get brittle.

So far, no corrosion on the pipe. If it does corrode, then why not cover the fittings as well?

__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D

The objective is insulation, not corrosion prevention. The wrong type of insulation can absorb and retain moisture and cause corrosion where it would not otherwise have been a problem.

Make sense. I added the foam just for the insullation.

__________________
RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

13 VW JSW 2.0 TDI 193K, Tuned with DPF and EGR Delete.

99 W210 E300 Turbo Diesel, chipped, DPF/Converter Delete. Still needs EGR Delete, 232K

90 Dodge D250 5.9 Cummins/5 speed. 400K

Gone and still missed...1982 w123 300D, 1991 w124 300D