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original bolt finish

Posted: Tue Sep 27, 2022 6:47 am
by Chris Cullin
Hi all, I am returning member after 20 yrs absence. Earlier I had a T5 coupe and an SC cab and rebuilt and finished the engines to original spec. now I have a C coupe that been sitting for 20 years and Im working on the brakes and suspension. I want to re-plate nuts and bolts to original finish but cannot find any lists of finishes. Does anyone know if there is such a list or if all nuts & bolts were finished in either cad/zinc or blackended or were some unfinished?

Re: original bolt finish

Posted: Tue Sep 27, 2022 7:32 am
by Vic Skirmants
Welcome aboard, Chris. I'm sure someone will answer your question shortly.

Re: original bolt finish

Posted: Fri Sep 30, 2022 2:43 pm
by Dennis Vogel
Chris Cullin wrote: Tue Sep 27, 2022 6:47 am Hi all, I am returning member after 20 yrs absence. Earlier I had a T5 coupe and an SC cab and rebuilt and finished the engines to original spec. now I have a C coupe that been sitting for 20 years and Im working on the brakes and suspension. I want to re-plate nuts and bolts to original finish but cannot find any lists of finishes. Does anyone know if there is such a list or if all nuts & bolts were finished in either cad/zinc or blackended or were some unfinished?
I went through this exercise a couple years ago. Long story short, be prepared for some ambiguity. The older parts catalog will tell you the finish of some things. Others you will have to discern based on the year. With a C, I think you may be getting into the 912 era where some things started being produced with a yellow / gold finish?

As a general rule of thumb for our T5, right or wrong, I landed on zinc (clear / silver) is probably closest to original for most things. If you prefer, you can still get cad done by folks like Van Nuys Plating. Cad Type I (clear) Class II (0.0003 inch) plating

There is a thread on the Early 911S Registry forum that sounds pretty convincing and applicable to all Porsche’s regardless of model.
  • Sometime in 1966 the transition from clear (silver) to yellow was made
  • Zinc was used rather than cadmium plating
  • Chromate or phosphate was used (giving it a yellow tint) in order to improve resistance to ‘white rust’
  • These were driven by DIN standards, not unique to Porsche
There are people on this forum that have forgotten more than I will ever know, but this is what I can offer from my own research.

Re: original bolt finish

Posted: Fri Sep 30, 2022 4:37 pm
by Mike Wilson
Welcome back, Chris. I just checked the C parts manual in the brake section, 3/8 C. It shows the different hardware. Some are marked galvanized zinc, some phr (phosphate) and others in nomenclature I am not aware of. Bostik is one and verz the other. When I did my brake, steering and suspension hardware, I went with black zinc.

Mike

Re: original bolt finish

Posted: Sun Oct 02, 2022 1:06 am
by Doug McDonnell
Nice old argument about the brake calipers: viewtopic.php?f=1&t=6722 My take is calipers gold either cad or zinc as I have never seen a chemical analysis. Caliper through bolts a black phosphate. Today yellow zinc would be easier and much cheaper. The bracket on the rear axel that holds the brake lines are yellow CAD the only place on a C/SC that I know of that was yellow Cad. Concensus on most other fasteners and linkages is Industrial clear zinc coating. See Joris's comment here: viewtopic.php?f=1&t=6722

Re: original bolt finish

Posted: Sun Oct 02, 2022 1:18 am
by Doug McDonnell
For a nice article go to Registry Magazine 38-5 and read Bruce Smith's "Plating at Home" article To find the article from the home page hoover on technical click on dropdown menu and click on document search. Then click on Magazine and Magazine article then click on Magazine article-pdf then on V30-39 then click on V38 and on the right will be all the articles. Bruce's article is the 26th I think. Another possibly easier way is to hoover over Media Center then click on Magazines and on the right side you will see magazine archive and click on Volume 46-31 then scroll down to volume 38-5 click on it and scroll down to the article on page 76. Oh and I forgot Welcome to the Registry !!!

Re: original bolt finish

Posted: Sun Oct 02, 2022 3:17 am
by Chris Cullin
thanks all for you guidance. I'll follow these leads through. The parts catalog I have has 'remarks' but no index what they mean, for example the calipers have remarks of /V/R and /V/L?

Re: original bolt finish

Posted: Sun Oct 02, 2022 3:22 am
by Chris Cullin
oh - I just discovered the parts catalog on the 356registry site - nice! This gives me something to work through as a guide :)

Re: original bolt finish

Posted: Sun Oct 02, 2022 7:28 am
by Dennis Vogel
Chris Cullin wrote: Sun Oct 02, 2022 3:17 am thanks all for you guidance. I'll follow these leads through. The parts catalog I have has 'remarks' but no index what they mean, for example the calipers have remarks of /V/R and /V/L?
The first few pages of the catalog should include a legend:
  • /V = front
  • /H = Rear
  • /L = Left
  • /R = Right
Other letters are sometimes country codes (e.g. CH is Switzerland)

Re: original bolt finish

Posted: Mon Oct 03, 2022 12:21 pm
by John Hearn
V = Vorderseite / Front
R = Rückseite / Rear
L = Links / Left
R = Rechts / Right
KTF
John

Re: original bolt finish

Posted: Tue Oct 04, 2022 12:39 am
by Dave Erickson
This topic has come up several times in the past. I have an Excel spreadsheet copied in 2016 from another thread that is quite extensive. I've attached it below.
Porsche%20Nuts%20and%20Bolts%20%282%29.xls
(47.5 KiB) Downloaded 166 times

Re: original bolt finish

Posted: Tue Oct 04, 2022 6:34 am
by Chris Cullin
the legend and spreadsheet are very helpful. I started creating a spreadsheet from the parts catalog and this will save me some trouble - although I will cross-check as I can't help myself.

Re: original bolt finish

Posted: Sat Jan 07, 2023 4:17 pm
by Chris Cullin
While working on the brakes and suspension I found myself going back and forward between the 356B, 356B T6 supplement, and 356C supplement Part Catalog, and the spreadsheet DaveErickson provided. I thought it would be useful to capture this information as I go and created a TEST website over the weekend.

https://356.miplace.com

Interest in your thoughts and comments. Would this be useful? Is this information already available in an easy-to-consume form?

I'm thinking the site would be developed over time, be opensource so others can update, and be structured in Group diagrams aligned with the original parts catalogs.

let me know your thoughts.

Re: original bolt finish

Posted: Sat Jan 07, 2023 7:12 pm
by Mike Wilson
Can't access it, Chris. It looks like the set up isn't completed.

Mike

Re: original bolt finish

Posted: Sat Jan 07, 2023 8:13 pm
by Chris Cullin
Doh!. should work now.