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> Transmission Case Protection, success
McMark
post Mar 19 2018, 07:52 AM
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What to do to protect a transmission case after cleaning has been a recurring topic over the years. Originally the transmission were covered with a 'cosmoline' like product which is a mix of wax and oil to protect the metal from corrosion. These products are still available and some people are recoating trans cases with this stuff to good success.

But that coating remains sticky/tacky over time. I don't like that. So I've been trying to go the epoxy primer route. These primers form a chemically hardened coating that'll last for years, isn't sticky, and looks great.

This blend of epoxy primer I used on the latest 915 transmission build is pretty much perfect color match and what I'm calling Magnesium Grey. The idea was to coat the case with something that essentially looks as close as possible to bare, oxidized magnesium.

The only problem with it, is that they can't mix anything less than a gallon. (IMG:style_emoticons/default/blink.gif)

So anybody need their transmission case painted? I'd love to run through this gallon ASAP.

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McMark
post Mar 19 2018, 07:53 AM
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This is the previous attempt that I was unhappy with.

Here's a picture of my last attempt for a 901 build, using a different mix of primer. It still looks great, but was far too 'blue' to look like bare metal. So I went back to the drawing board and tried a different brand and mix of epoxy primer.


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DRPHIL914
post Mar 19 2018, 08:02 AM
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how much does it take to do one transmission? can you put it in an arisol can or can it be brushed on? I ask because my motor is out and cleaned up having degreased it before re-install but still attached to motor, and I really don't want to pull it apart -
so send it my way , let me know how much for say a pint or what it will take you think to do this -

Phil
-ps, got that part you sent my way, thanks,
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Larmo63
post Mar 19 2018, 08:04 AM
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I'd be thrilled if my installed transmission would have looked like that before we put it in.

That looks killer.
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McMark
post Mar 19 2018, 08:11 AM
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QUOTE(Philip W. @ Mar 19 2018, 10:02 AM) *
how much does it take to do one transmission? can you put it in an arisol can or can it be brushed on? I ask because my motor is out and cleaned up having degreased it before re-install but still attached to motor, and I really don't want to pull it apart -
so send it my way , let me know how much for say a pint or what it will take you think to do this -
I don't have the means to put it in an aerosol. I could get it broken down into smaller quantities. But you'll need something to spray it, like the Harbor Freight HVLP spray gun. (IMG:style_emoticons/default/idea.gif)

QUOTE(Philip W. @ Mar 19 2018, 10:02 AM) *
-ps, got that part you sent my way, thanks,
Good! I forgot to send the tracking number. Keep us posted on how your experience is with them.
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mepstein
post Mar 19 2018, 08:39 AM
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I would look at Cericote. the right color will look closer to stock. it doesn't have the smooth, shiny look of epoxy but is very scratch and chip resistant.
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DRPHIL914
post Mar 19 2018, 08:43 AM
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might have to pull the exhaust off I guess, should be able to tape off and cover motor to spray the transmission-
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914_teener
post Mar 19 2018, 10:25 AM
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Lately I was talking to a friend who has a Phd in material science.

The topic of heat dissipation materials and coatings came up.

There are some new coatings that have some very interesting entropic heat dissipative properties. Some of them have heat deposition applications and some are like power coating. I know they have been using the heat dissapative or entropic black on mortorcycle cylinders for some time.

....just a side comment.
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Mblizzard
post Mar 19 2018, 10:36 AM
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No where as good as any of the previous options but I have had good success with Dupli-Color EHWP10107 Silver High Performance Wheel Paint.

Not sure that this the exact color I was using but I will verify.

Not a great picture but I used it on the impeller housing.

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SirAndy
post Mar 19 2018, 11:09 AM
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Well, you do have my 915, so if you need to get rid of all that paint, just throw some on there.
(IMG:style_emoticons/default/biggrin.gif)
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McMark
post Mar 19 2018, 11:43 AM
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QUOTE(SirAndy @ Mar 19 2018, 01:09 PM) *

Well, you do have my 915, so if you need to get rid of all that paint, just throw some on there.
(IMG:style_emoticons/default/biggrin.gif)

That's a great idea. (IMG:style_emoticons/default/cheer.gif)
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maf914
post Mar 20 2018, 05:44 AM
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Mark, How did you clean the tranny case before spraying?

Degrease, wire brush, blast, etc.? After all the prep I would hate to see the paint or coating peel off.
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Mblizzard
post Mar 20 2018, 06:40 AM
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QUOTE(maf914 @ Mar 20 2018, 03:44 AM) *

Mark, How did you clean the tranny case before spraying?

Degrease, wire brush, blast, etc.? After all the prep I would hate to see the paint or coating peel off.


There is another thread on cleaning the trans while assembled. I think your choices are more limited when it is assembled. For me, I would never blast unless it was a soft media (walnut shells) and even then, I am leery of removing all abrasive from an environment where residual abrasive can result is massive damage.

For an assembled case some pressure wash but I have never been a fan of that. For me, I set the trans in front of an electric heater for many hours and get it warm. Next use degreaser of choice. Me I like Awesome available at Dollar General stores. Dirt cheap and works. From here it takes some elbow grease. I got a large coarse plastic bristle brush for my drill and used it. Rinse with light spray of water.

Reapply cleaner and repeat until satisfied.

After that I use a fine brass bristle brush for the drill to clean off any difficult materials and to go over the whole case. Make sure you get all brass brush not just brass coated steel wire.

As an example here is an engine case I did with the brass brush.

Attached Image

No Paint at all!

Of course there are many more difficult spots to clean on the trans than the case so getting it to this point would take a long time. So I would likely do the clean and then paint. I do a final rinse with a mild solvent like alcohol or acetone.
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McMark
post Mar 20 2018, 07:10 AM
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Mike, that works great for the aluminum engine case, but the magnesium transmission case will corrode more quickly, so protection is a bit more important. I feel no motivation or necessity to start painting engine cases.

But transmission cases make me a bit nervous to leave bare.


BTW, that engine looks like it's got 911 cylinders...or maybe Biral....(IMG:style_emoticons/default/blink.gif)
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Mblizzard
post Mar 20 2018, 07:19 AM
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QUOTE(McMark @ Mar 20 2018, 05:10 AM) *


BTW, that engine looks like it's got 911 cylinders...or maybe Biral....(IMG:style_emoticons/default/blink.gif)


Might have a little something in that department.

Agree on the trans painting. The brass brush just makes it hard to do any damage to either of the cases.
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bulitt
post Mar 20 2018, 07:31 AM
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I have brushed epoxy on tractor cases for years. Works really well on rough surfaces. No signs of cracking overtime. Needs to be mixed with thinner and hardener. Flows very well.
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914Sixer
post Mar 20 2018, 11:12 AM
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Why not spray it with LPS 3? It is a spray on type waxed coating. Not cheap at $18 a can but it should do the whole transmission. I would think the resistance should be similar to that of the cosomline or perhaps better.
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McMark
post Mar 20 2018, 12:28 PM
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QUOTE(914Sixer @ Mar 20 2018, 01:12 PM) *

Why not spray it with LPS 3? It is a spray on type waxed coating. Not cheap at $18 a can but it should do the whole transmission. I would think the resistance should be similar to that of the cosomline or perhaps better.

Because after I did that I wouldn't ever want to touch it again. Sticky and oily is my experience with those coatings. Especially on hot days. I spend a lot of time trying to get things clean, and a wax/oil coating (while extremely effective for corrosion protection) is not what I call a clean finished product.

Nothing against it. It works great. It's just not something I want to deal with.

But I should try it and see. I'll order a can and make sure it's what I think it is... Thanks for the lead.
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11tenths
post Mar 20 2018, 01:04 PM
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I've used Gibbs Brand spray lube on all the metal surfaces including the 6 fan and housing and really like the natural finish.

http://www.gibbsbrandlubricant.com/

-Harry
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McMark
post Mar 20 2018, 01:26 PM
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Ordered. Will update on Thurs. When it arrives.
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