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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
post Jul 9 2009, 03:51 PM
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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
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tat2dphreak
post Jul 9 2009, 04:23 PM
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I used engine brite and simple green... and a wire brush,

if I had a washer handy, I'd use that... it shouldn't get much water in it, and if it's going to be rebuilt anyway...
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EdwardBlume
post Jul 9 2009, 05:01 PM
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I used a wire wheel on a drill on the dry stuff, and lots of hours scraping the wet stuff.
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r_towle
post Jul 9 2009, 06:35 PM
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put a cover on the vent hole.
Power wash it.

Rich
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Rand
post Jul 9 2009, 06:42 PM
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I think somebody said once to not use a steam cleaner on them, but I can't imagine why.
Steam cleaners work wonders and take all the hard work out of it.
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Ian Stott
post Jul 9 2009, 06:47 PM
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I soaked mine in a degreaser I bought at Canadian Tire/Walmart rinsed it off and did the spots that needed it again and it came up pretty good. Don't forget to cover up the little vent hole. I think using a pressure washer or steamer is ok, just the back splash is real messy and sprays dirty oily greasy stuff everywhere!

Ian Stott
Moncton
Canada
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SUNAB914
post Jul 9 2009, 08:21 PM
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Simple green and brush, that will do it.
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Cupomeat
post Jul 10 2009, 10:22 AM
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Thanks, I'll do the simple green method first and if that doesn't do enough, I'll dfir up the ol' power washer, seal the vent and blow crap everywhere...
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RiqueMar
post Jul 10 2009, 10:36 AM
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QUOTE(Cupomeat @ Jul 10 2009, 09:22 AM) *

Thanks, I'll do the simple green method first and if that doesn't do enough, I'll dfir up the ol' power washer, seal the vent and blow crap everywhere...


If you are going to wash it, a good idea is to take it to one of those go-it-yourself car washes. Dirt and gunk just washes away, and no clean up.
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Tman914
post Jul 10 2009, 10:52 AM
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I use the oven cleaner that work out the best for me let it sit for 30 mins
then i pressure wash it came out nice and clean
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sww914
post Jul 10 2009, 01:38 PM
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DITTO the oven cleaner. It's made for cleaning baked on grease.
Simple green is made for cleaning dogshit off of the side of your shoe.
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turboman808
post Jul 10 2009, 03:18 PM
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Wouldn't wheel cleaner like P21s wheel cleaner be good for cleaning transmissions. It's ph balanced and can get off caked on brake dust. It's $30 for a very small bottle though.

I hear griots is just p21s relabeled but for 1/5th the price. Haven't bought any yet but here very good things about it.


I would probably try this before I used overn cleaner. That stuff is pretty nasty.
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Cupomeat
post Jul 13 2009, 02:23 PM
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Ok, So I didn't have any dog crap on my shoe (IMG:style_emoticons/default/biggrin.gif) so I went the oven cleaner route...

Well, it got most of the caked on grease off, and the tootbrush agitation helped some, and the power washer did the most of all, I think.

Looks like another 4 hrs of detailing and i'll have a pretty (clean, anyway) transmission.

SO, should I paint it?

Black?
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Rand
post Jul 13 2009, 02:34 PM
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I wouldn't paint it. Just creates more maintenance and holds more heat. Paint is for sealing metal to prevent rust, or for looks. The tranny isn't going to rust, and if someone does look under your car a clean tranny will look as good as a painted one. But then again, looks are subjective, so if YOU like the look of a color, go for it.
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Ian Stott
post Jul 13 2009, 02:41 PM
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I agree with not painting it, if you have it all cleaned up as it sounds like you have ,it actually looks better that way. Periodic cleaning after that say when you change your oil or set your valves and it will always look good. Painting it seems to look funny and for me it makes me wonder what someone is trying to hide.

Ian Stott
Moncton
Canada
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Katmanken
post Jul 13 2009, 02:48 PM
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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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Cupomeat
post Jul 13 2009, 02:49 PM
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What? ME? trying to hide something?

I assure you that neither me, my lawyer, NOR my congressman(woman) are trying to hide anything... ever...

LOL, seriously, Thanks for the feedback.
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Ian Stott
post Jul 13 2009, 02:53 PM
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I stand corrected! I will now check mine for corrosion and search out some of that paint and do mine. I don't drive in the rain or even if it looks like rain but have been caught, thankfully not too far from home.

Ian Stott
Moncton
Canada
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charliew
post Jul 13 2009, 07:12 PM
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I would use ppg dp90lf epoxy primer and leave it black but you could top coat it a color for more protection. Dp 90 is a nonsanding primer if you top coat it within about 12 hrs it has great adhesion between the case and the top coat paint. I would wait to paint it after it's rebuilt though.
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Pat Garvey
post Jul 13 2009, 07:23 PM
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QUOTE(Cupomeat @ Jul 9 2009, 03:51 PM) *

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

I'm curious, why would you want to paint it? You DO realize that you're the owner of a vinyage car, right? So, why would you want to screw it's resale value by paint the tranny, which is nearly impossible to fully remove?

I don't get it! Why paint? Why not clean it up with chem's/steam & let it re-oxidize to its proper shade?

Apparently, I'm missing something here........
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