 Fuel Cap Finish, I'm over thinking again... |
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Model Specific Information
914/4: 70 71 72 73 74 75 76 914/6: 70 71 72
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| bbrock |
 Jan 14 2019, 10:21 AM
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#1
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914 Guru  Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains 
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I'm pretty sure I've seen a thread on this but I couldn't find it with search. All of he survivor and reference photos show the cap being dull silver with what appears to be a plain zinc finish - same as mine. But when I inspected my cap, I found traces of what sure looks like cad/yellow chromate under the tangs. Now here's the over thinking... yellow dichromate is not that durable and easily removed with many solvents or worn off. Is it possible these caps started with a yellow chromate finish that was soon lost due to a combination of fuel vapor and hand wear? For those who saw these cars fresh off the boat, what is your recollection?
It's a little hard to tell in these pics, but in good sunlight, the color under the tangs is iridescent yellow and looks exactly like cad/yellow zinc.   |
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| mepstein |
Jan 14 2019, 10:25 AM
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#2
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914-6 GT in waiting Group: Members Posts: 19,237 Joined: 19-September 09 From: Landenberg, PA/Wilmington, DE Member No.: 10,825 Region Association: MidAtlantic Region
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I think my early ones were yellow but I'm not sure how to get it back since the cap is crimped around an inner rubber seal.
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| bbrock |
Jan 14 2019, 11:17 AM
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#3
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains
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QUOTE(mepstein @ Jan 14 2019, 09:25 AM)  I think my early ones were yellow but I'm not sure how to get it back since the cap is crimped around an inner rubber seal. This was the tipping point for me to order some chemicals to try my hand at electroplating so I can refinish problem parts like this that can't be sent out for barrel plating. My backup plan will be Eastwood's CAD paint. https://www.eastwood.com/eastwood-golden-ca...ASAAEgIucPD_BwE |
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| 914Sixer |
Jan 14 2019, 08:08 PM
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#4
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914 Guru Group: Members Posts: 8,869 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Yellow Zinc.
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| 914Next |
Jan 15 2019, 09:47 PM
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#5
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Senior Member Group: Members Posts: 699 Joined: 28-July 14 From: Ephraim Wisconsin Member No.: 17,695 Region Association: Upper MidWest
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QUOTE(914Sixer @ Jan 14 2019, 09:08 PM) Yellow Zinc. I'm not convinced. Mine shows no signs of yellow zinc and Steve G's looks like it wasn't either. http://www.914world.com/bbs2/uploads/post-...-1260238697.jpg |
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| Cal |
Jan 16 2019, 12:13 PM
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#6
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Senior Member Group: Members Posts: 614 Joined: 19-November 14 From: Philadelphia Member No.: 18,138 Region Association: North East States |
QUOTE(914Next @ Jan 15 2019, 10:47 PM) QUOTE(914Sixer @ Jan 14 2019, 09:08 PM) Yellow Zinc. I'm not convinced. Mine shows no signs of yellow zinc and Steve G's looks like it wasn't either. http://www.914world.com/bbs2/uploads/post-...-1260238697.jpg Yes, I would agree....mine doesn't show any evidence of yellow zinc. Attached thumbnail(s) 
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| dr914@autoatlanta.com |
Jan 18 2019, 05:05 PM
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#7
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914 Guru Group: Members Posts: 7,816 Joined: 3-January 07 From: atlanta georgia Member No.: 7,418 Region Association: None |
there were some replacement caps offered in yellow, but the original ones were silver cad
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| defianty |
Jan 20 2019, 03:13 AM
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#8
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Senior Member Group: Members Posts: 659 Joined: 9-August 06 From: Essex, UK Member No.: 6,621 Region Association: None  |
@bbrock
Stumbled on this image - Thought I'd post it here for reference. (IMG:http://www.914world.com/bbs2/uploads_offsite/i.postimg.cc-6621-1547975613.1.jpg) |
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| bbrock |
Jan 23 2019, 09:41 AM
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#9
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains
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Right or wrong, mine looks like this now. A few things I can say about my cap. It is stamped with the VW logo so I assume it is OEM. I can't rule out it being a replacement but I've owned the car since 1984 and I don't recall it showing up in the extensive stack of receipts dating back to 1978 from the PO. I will double check that. The original finish on this cap was zinc with a yellow chromate coating. I know it was zinc because 5% muriatic acid took the original finish off and from what I've read, it would not have taken cadmium off. I'm 99% certain there was a yellow chromate coating because of the traces that remained under the tangs and inside the cap. I don't know if it is the original cap that came on the car, but it is now restored to its original finish. Easy to reverse back to bright zinc if I want.
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