How do YOU protect your transmission case from corrosion?, What coatings do you use? Options

[Dr Evil]

I am trying to finish my notes to accompany the rebuild video (notes will be free) and I am wanting to pick your collective brains for info on corrosion prevention for the mag alloy case. What do you do? The factory coating only lasted a few years and is long gone now. On most peoples cases, it is the oil that keeps it from corroding (IMG:style_emoticons/default/wink.gif)

[Richard Casto]

Mike,

I started a long term test of a few cleaning and protection methods a few years ago. Check this out...

http://motorsport.zyyz.com/project_914_03_14.htm

Last update was early 2008. Part is still hanging up outside and I need to bring it in and take some more photos. I look at it periodically, but in general I would stand by what I said last time I posted and that is...

* Media blasting is the best at cleaning, but it removes the chromate conversion that may still provide some corrosion protection.
* Gibbs Brand Penetrating Oil/Lubricant works, but it's not a miracle product.
* CRC Heavy Duty Corrosion Inhibitor seems to work the best. This is not surprising since Porsche also used a waxy protectant (Tectyl) on the magnesium transmissions parts.

So short of finding a place to buy Tectyl (what the factory used and I can't seem to find anyone who sells it in small quantities), I would go with "CRC Heavy Duty Corrosion Inhibitor".

http://www.crcindustries.com/ei/content/pr...N=06026&S=C

Occasionally I find this stuff at stores, but generally I have to order it. It is somewhat targeted at boaters, so I have yet to see if boating supply stores carry it on a regular basis.

Richard

[pcar916]

... would go with "CRC Heavy Duty Corrosion Inhibitor".

I'm about to order something myself so this is a timely discussion. I got mighty frustrated last year trying to find Tectyl. But in addition to Richard's suggestion, which is described as "dark amber" have any of you tried CRC 3-36 product as well?

http://www.crcindustries.com/ei/content/pr...N=10200&S=Y

It's temperature range is up to 300 degrees and it's just plain "amber" which Tectyl is too. I don't know how that compares with the Marine CRC stuff. According to the spec-sheets, the marine stuff appears to be more viscous than 3-36. Here's a newer coating. I don't know anyone using it on one of our cars.

http://www.tagnite.com/video/ and

http://www.tagnite.com/

Links to Tectyl:

http://www.daubertchemical.com/main.taf?p=3,1

http://tectyl2.valvolineeurope.com/index.a...ba0e5105135c4d5

Also, here is a link to an old thread that covers a lot of ground on this topic.

http://forums.pelicanparts.com/porsche-911...-corrosion.html

Good reading!