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Fan corrosion opinion
Hi.
Anybody have an read on whether the corrosion on this fan and, particlarly the housing, looks 'normal' 'average' 'not an issue' 'not good'. It seems extreme to me for a CA car. Just wondering why it would look like that. I know it's only one picture, but any comments, red flags, greatly appreciated. Thanks. 
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10-24-2019, 10:08 AM
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That looks like the coating peeling off, not metallic corrosion.
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10-24-2019, 10:14 AM
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Location: San Antonio, Texas
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That looks like it lived by the beach. No coating from the factory, just chromated then waxoyl type sealant protectant.
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1973 911S (since new) RS MFI specs 1991 C2 Turbo |
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10-24-2019, 11:14 AM
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Location: wisconsin
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Quote:
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10-24-2019, 03:47 PM
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Location: San Antonio, Texas
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That is what they call the process. Same for gearbox and all the magnesium parts. If you soda blast it and the housing and then apply a waxy cosmoline type oil you can get close to the original finish. It's been covered here quite a bit.
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1973 911S (since new) RS MFI specs 1991 C2 Turbo |
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10-24-2019, 03:59 PM
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DIY Yellow Cadmium Plating - works amazing! |
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10-25-2019, 09:51 AM
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
Posts: 7,129
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Quote:
Can you give us a source for this substance?
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
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10-25-2019, 10:09 AM
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polish it and will look great. I used the cone shaped polisher that attaches to a drill and some cream
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10-25-2019, 11:33 AM
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Vintage Owner
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I had mine polished, but it quickly loses it’s shine. Perhaps a coating like Ceracote might slow things, but magnesium likes to return to it’s elemental state.
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84 Targa (sold) 70 914-6 (sold) 73 914-6 2.7 conversion (sold) 75 GMC Motorhome (sold) 2016 Cayenne |
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10-25-2019, 01:52 PM
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 or you can powder coat it..... 
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10-25-2019, 03:05 PM
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Location: San Antonio, Texas
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Just about every option here:
I'm no fan Simplest is to bead blast and apply "Tectyl" or other wax based coating on a regular basis. I use Wurth HKS, I think that is the correct name.
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1973 911S (since new) RS MFI specs 1991 C2 Turbo |
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10-25-2019, 03:45 PM
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Under the radar
Join Date: May 2007
Location: Fortuna, CA. On the Lost Coast near the Emerald Triangle
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Thanks for the link. Yea, still no consenses. Some say use that Tectyl, others say is is a sticky mess.
I soaked mine in chromate. Chromate doesn't do a lot to magnesium. Then Gibbs. Looks OK. Would like to hear from more that have used either Tectyl or something else that looks original. Here is mine. 
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Gordon ___________________________________ '71 911 Coupe 3,0L outlawed #56 PCA Redwood Region, GGR, NASA, Speed SF Trackrash's Garage :: My Garage |
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10-25-2019, 05:05 PM
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That looks pretty good
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10-25-2019, 05:18 PM
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inspect it closely for cracks and deep corrosion thats erupting out.
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82 SC , 72 914 |
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10-25-2019, 06:15 PM
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Heck, I’m only 5 not 71!
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I personally think the appearance of the fan is normal corrosion over time. My fan looked like that in 1998 when i rebuilt my engine and i cleaned and polished the fan. Today, the fan looks like it has a light layer of corrosion and the car has been garage kept. I guess it is just a natural patina over time.
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Pat Henry Targa80 1980SC Targa (Mocha Brown) |
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10-26-2019, 03:20 AM
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Clean it up and put some Gibbs on it while you are thinking about it.
https://www.google.com/search?client=firefox-b-1-d&q=Gibbs+oil |
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10-26-2019, 03:25 AM
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The fan looks like somebody sprayed it with clear and it peeled and yellowed over time. I built a vapor honing cabinet which seems to close up the pores on magnesium and aluminum, almost like shot peening.
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10-26-2019, 05:22 AM
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Location: So. Calif.
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Not sure why Gibbs is the preferred product. Here's a comparison test that includes corrosion resistance with several products.
Comprehensive Corrosion Test: 46 Products Compared | Day At The Range Be aware the tests spanned several hours and/or days. IMHO, protecting bare metal and/or a Mg fan for months or years is a bigger job than any of these products can handle. I think a protective coating like Cerakote or equivalent is the way to go. Since it's a coating, surface blems can be addressed with filler materials as needed and thus won't be visible after applying the coating. Sherwood |
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10-26-2019, 03:38 PM
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The fan in my 87 has remnants of the same coating. |
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10-26-2019, 04:03 PM
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Join Date: Aug 2018
Location: San Diego, CA
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This is what my '85 fan looked like a few hours back, same yellow factory coating deteriorated.
 And after a few hours of elbow grease - 
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1978 SC Targa |
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10-26-2019, 04:42 PM
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Black Label
My Garage
1971 Porsche 911
Baja Bug
1970 Porsche 914-6 (sold)
1973 porsche 914-6 conversion (sold)
1984 Porsche 911 Carrera Targa - sold
GMC Motorhome
Pre- H20
Porsche
1972 porsche 914
