Best way to Clean (exterior) a 914 Transmission, I am about to have it Evil rebuilt (third one is a charm) and want to |
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Best way to Clean (exterior) a 914 Transmission, I am about to have it Evil rebuilt (third one is a charm) and want to |
Cupomeat |
Jul 9 2009, 03:51 PM
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#1
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missing my NY 914 in VA Group: Members Posts: 1,338 Joined: 26-November 07 From: Oakton VA Member No.: 8,376 Region Association: MidAtlantic Region |
Any tips/advice for cleaning the exterior of a transmission?
I scraped and got most of the obvious road dirt off it last night, but I'd love to paint this one after it gets back from Doc. Evil's GearBox Summer camp. (IMG:style_emoticons/default/351.gif) I am afraid to use a pressure washer for fear of water ingress, and obviously, the least amount of chemicals the better. Thanks |
Katmanken |
Jul 13 2009, 02:48 PM
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#2
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You haven't seen me if anybody asks... Group: Members Posts: 4,738 Joined: 14-June 03 From: USA Member No.: 819 Region Association: Upper MidWest |
Ok, here we go again.
The trannys are magnesium and are treated with a protective chemical "pickle" coating. When you oven clean it, the strongly basic solution eats the pickle. Then the unprotected magnesium looks good for a short period of time until it starts to "rust". Mag rust is black and looks really ugly. Mag rust is accelerated by salt and moisture.... Since the protection is gone, I'd paint it. The zinc handbook (from my zinc parts design days) says zinc chromate can be used as a sacrificial coating. Unfortunately, the good grades of zinc chromate are usually aircraft grade and are bright yellow or green. Or, an epoxy or self etch primer is good. I used self etch primer and a thin silver color coat. In any case, do a search. There are other options such as protective oils in other threads.... |
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