Daniel5691

I have been reading the June 1977 C&D article about the 928.
In the photograph of the engine bay, it seems that numerous hose clamps have
a brass/yellowish color?

Is there a "special" type of hose clamp that was used from the factory?
Since I am an idiot when it comes to the interweb, the best I can do is link the article itself for you to look at....

https://drive.google.com/file/d/0B97...ZYVlZGck0/edit

Education, please??

Dan

voskian

Original plating I believe was cadmium, but now yellow zinc is used for replicating the "yellow" coating.

Attached is engine compartment on my 34k miles engine showing original platings on the clamps and parts. This helps prevent corrosion.

Daniel5691

Mr Voskian,
Wow, what an amazing engine bay!!!
That is a great photograph, and it gives me a lot of inspiration to keep working
on my car, as well.
Your engine looks brand new, sir.
It makes me wonder if my "original" parts could be re-plated, or if it might be better to look for the replacement yellow-zinc parts you mention.....

Thanks,
Dan

NoVector

The hose clamps, like almost all the other bits/pieces were electroplated. I.e., another metal was deposited on the base metal for corrosion protection.

You’ll see in Renlist searches where some people do a top end refresh they take all the stuff (by the bucket) to a plater and have it redone. [EDIT: Like the one above--nice job btw!]

I bought a home kit a couple years ago from a place in the UK called Gateros. It uses zinc and then a quick soak in a yellow passivate.

Probably easier and cheaper to take it to a plater though—but not as fun

If you wanted to buy new fasteners, search for “yellow zinc”.

Hilton

Yes you can get them re-plated in zinc plate, with a chromate yellow passivation coating.

If you do a search for zinc plating here you'll find a lot of posts of old bits which have a nice new shiny yellow sheen.

The zinc plating doesn't last as long as the original factory cadmium, but cadmium is toxic and hard to find these days. If you do get zinc plating done, I recommend using a clear-coat over the bits so they keep their sheen.

Wisconsin Joe

Cadmium is nasty stuff. Toxic.

Not too many places will work with it any more.
Very few small shops will touch it.

Even getting the old parts cleaned off is hazardous. Sanding or wire brushing it generates dust, which is toxic (getting a bit repetitive here, but the stuff is bad news).

Zinc, however is pretty easy to work with.
There are even "do it yourself" kits.

Scott Yoo (syoo8) posted a very detailed (and pic heavy) thread that included his adventures with a Caswell Copy Cad kit.

Thread here:

https://rennlist.com/forums/928-foru...rst-timer.html

Daniel5691

Thanks everyone, much appreciated.
dan

SMTCapeCod

There are a few places/people that replate- not original cad, but close.
Or, stainless replacements can be sourced.

granprixweiss928

I replated all my parts when I did my 81's engine.

harveyf

Agree with the above posts. From an engineering standpoint, zinc is pretty good from a corrosion standpoint. The "passivating" or "conversion" coating makes the part even more durable against corrosion. And it looks much better. I'm sure Porsche engineers wanted the improved durability and the marketing guys liked the bling. I am pretty sure you can put the conversion coating on both cad and zinc. Here in NC, I use the following firm for zinc plating: http://www.electroplate.biz/quality-...tml#ad-image-0 Their website has some basic info and some pictures. You can get your conversion coating in black, blue, olive drab, yellow, and clear.

granprixweiss928

I will add...I did mine in the spring of 2014. they are now silver (the clamps on engine pipes especially) due to oxidization I guess. I also zinc plated my brakes and then coated them in clear high heat paint and then baked them in the oven. They had stayed yellow color.

theedge

You can buy the OEM style by the bucket full from McMaster Carr. They are silver but very high quality and available in a range of sizes.

danglerb

When I redid my fuel injection I got zinc dicrhomate plated Norma clamps from Belmetric.

Something to consider with plating, do a bunch, results will vary, and you will want plating to match as close as possible.

GeorgeM

I think you'll find that new yellow zinc clamps are difficult to find unless you get a large quantity. If Belmetric can get them, they're one of the few.

Also, if you want the exact replacement clamps (like for coolant hoses), you'll likely have to re-plate some of the ones you have.

The fasteners are much easier to get, but even then, some unusual ones, like some of the short headed ones, are tough to find.

Shiny bits will definitely raise the level of the engine bay as the pics show.

Tom in Austin

Can you safely re-plate an item with a rubber diaphragm inside, like fuel pressure regulators, air diverter valves, etc.?