It will not weld successfully, Cast aluminum is very porous. The cracked area will have "sucked in" oil vapors and absorbed it like a sponge. To weld aluminum successfully, it must be contamination free, and clean and bright. Aluminum when clean will oxidize almost instantly. Oxidation is a weld contaminant in welding aluminum.
Also, to get good adheasion with JB Weld, the crack needs to be free of oil residue left from vaporous pass through. Thus, my assessment would be, take it back to PnP, point to the crack, and say, "I want another one, this one is cracked and can't be fixed properly." Finding one not cracked vs spending money and time trying to fix the cracked one, would be my choice option. <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=icon> Virus-free. www.avast.com <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail&utm_term=link> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> On Fri, Mar 24, 2017 at 7:35 PM, Max Dillon via Mercedes < mercedes@okiebenz.com> wrote: > If it doesn't leak, don't mess with it! Polish, install, enjoy. > -- > Max Dillon > Charleston SC > '87 300TD > '95 E300 > > On March 24, 2017 7:56:42 PM EDT, clay via Mercedes <mercedes@okiebenz.com> > wrote: > >I scrounged a valve cover from the 300D at PnP the other day. OM617 > >engine and the thing looked ok enough to pick it, but there was the > >standard coating of grime. I washed it off and got some 000 steel wool > >to buff it prior to going to town on a full shiny polishing. There is > >a crack, looks like a casting failure actually, on the front that goes > >full across at the spot two thirds up where the vertical angles back to > >the rounded top. Crack is through and through, but shows no sign of > >oil having seeped. > > > >Question is — Will it weld? Do I need to worry about welding? It is > >probably a job I can swing with a torch and aluminum rod, but is it > >really critical? > > > > > >clay > > > >2002 s430 - Victor, a Stately & well tailored chap > >1974 450sl - Frosch - Two tone green > >1986 SDL - Polei > >1982 300 SD - Allen > > > >retired models- > >1976 300D - Blei Vanst - it looks silvery > >1972 220D - Gump - She was green, simple and ran > >1995 E300D - Gave her life to save me against a Dame in a SUV > >POS 1987 SDL - Beware Nigerian Scammers > > > > > > > > > > > > > > > > > >_______________________________________ > >http://www.okiebenz.com > > > >To search list archives http://www.okiebenz.com/archive/ > > > >To Unsubscribe or change delivery options go to: > >http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ > http://www.okiebenz.com > > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > > _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
