Is there a (protective) coating on the injection lines? - Mercedes-Benz Forum

 
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post #1 of 4 (permalink) Old 07-31-2013, 06:20 AM Thread Starter
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Is there a (protective) coating on the injection lines?

So I've been cleaning out the metal parts in the engine bay, such as the cold start valve and bolts using a simple chrome / metal cleaner (Autosol). This has worked flawlessly. However when looking at the injection lines, they almost seem green, or at least a different shade than anything else in the engine bay. I've cleaned an inch off a metal part in that shade of green and when cleaned, it looks exactly like everything else, loosing the green shade.

Is this green shade some sort of protective coating on the injection lines, and can I just polish them using a chrome / metal cleaner (such as Autosol?). It has worked fine in rest of the engine bay, but I certainly wouldn't want to remove some protective coating just for a shine.

Here are some pictures of what I am talking about:
How the fuel lines currently look:


How they look like polished(?)


What it looks like when polished:
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post #2 of 4 (permalink) Old 07-31-2013, 11:33 AM
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That is all zinc or yellow chromate plating. clean it gently, you dont want to polish it all off or it will rust. Try Mr Clean sponges.

Last edited by rumb; 07-31-2013 at 11:35 AM.
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post #3 of 4 (permalink) Old 07-31-2013, 12:44 PM Thread Starter
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I'll see if I can get something like that. I tried using a copper / brass cleaner but to no avail. Thanks!
(Are there more ways to properly clean this?)
EDIT: yeah, we don't have anything like this sponge here. What sort of chemicals should I look for? I'd like to bring the tubing back to life.

Last edited by Jackpody; 07-31-2013 at 12:47 PM.
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post #4 of 4 (permalink) Old 08-01-2013, 06:38 AM
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Your best bet is to clean it as gently as possible.

If you get to the point where you are stripping the finish off, there are places that will refinish your injection pipes, and other parts. (Look at Bud's Benz, Restoration, Engine Restoration, 111 Chassis, Engine 2)

Bud's Benz Restoration Portfolio
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