Zinc Foil 41331885099

Post your E12 technical questions and comments here. Please, no off-topic posts.

Moderators: Mike W., Pierre

Post Reply
User avatar
528i-1981
Posts: 349
Joined: Wed Feb 07, 2018 5:50 am
Location: Boston North Shore, MA

Zinc Foil 41331885099

Post by 528i-1981 » Sat Dec 28, 2019 9:14 pm

What is the purpose of these small squares of zinc when mounting the apron? This same part is used in completely different locations on the E28 and E36.

Image
(oo=00=oo) Eric
1981 528i Manual

Champie12
Posts: 17
Joined: Thu Aug 22, 2019 12:37 pm

Re: Zinc Foil 41331885099

Post by Champie12 » Mon Dec 30, 2019 11:01 am

Thats interesting, I'm not sure exactly but I feel like it would have to do with corrosion prevention (so you can get your nuts off and the sheet metal wont rust)? Or perhaps it spreads the load the clamping force the nut and bolt are exerting on the body's sheet metal?

User avatar
528i-1981
Posts: 349
Joined: Wed Feb 07, 2018 5:50 am
Location: Boston North Shore, MA

Re: Zinc Foil 41331885099

Post by 528i-1981 » Mon Dec 30, 2019 6:39 pm

I found a reference to zinc foil on a VW board used for mounting the fender, and it's purpose was as a sacrificial anode for corrosion protection. The consensus there is that they don't provide much protection. There weren't any foil squares on the apron when I removed it, so either the PO had the apron off and didn't replace these or else they were consumed and vanished after 38 years.
(oo=00=oo) Eric
1981 528i Manual

Post Reply