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> Cleaning Trannies?, These ones lived thru the barn fire
pete-stevers
post Oct 22 2017, 01:39 PM
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I have a couple of transmissions that lived thru the barn fire
They are all black with soot ... I AM thinking oven cleaner... any other thoughts (IMG:style_emoticons/default/idea.gif)
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iankarr
post Oct 22 2017, 02:28 PM
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Brake cleaner. Expect to go through 5-6 cans. Mineral spirits works great, but takes more effort. Are you planning on taking the gear stack out, breaking the box down and replacing the seals? If so, you can dip the cases or soda blast. I'd probably stay away from oven cleaner, as it may pit the box if you're not careful.
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porschetub
post Oct 22 2017, 03:02 PM
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Block off the case breather with duct tape,brush non caustic degreaser on and waterblast them.
A big NO to the oven cleaner as mentioned,how these clean up will most likely indicate how hot they got,@ minimum I would replace the input shaft and output shaft seals.
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Dr Evil
post Oct 22 2017, 08:22 PM
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Oven cleaner is fine, I have run tests with it over months with no pitting. Old wives tail. Likely the best fit for your situation. You should pull the stack and wash the cases thoroughly. If I can help, let me know. What ever I have to give is yours.
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914_teener
post Oct 22 2017, 08:38 PM
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QUOTE(porschetub @ Oct 22 2017, 02:02 PM) *

Block off the case breather with duct tape,brush non caustic degreaser on and waterblast them.
A big NO to the oven cleaner as mentioned,how these clean up will most likely indicate how hot they got,@ minimum I would replace the input shaft and output shaft seals.



If one water blasts it and doesn't pull the stack.....the gears will rust.

Ask me how I know.
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Dr Evil
post Oct 22 2017, 08:47 PM
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QUOTE(914_teener @ Oct 22 2017, 10:38 PM) *

QUOTE(porschetub @ Oct 22 2017, 02:02 PM) *

Block off the case breather with duct tape,brush non caustic degreaser on and waterblast them.
A big NO to the oven cleaner as mentioned,how these clean up will most likely indicate how hot they got,@ minimum I would replace the input shaft and output shaft seals.



If one water blasts it and doesn't pull the stack.....the gears will rust.

Ask me how I know.

Water will get in the side seals and other parts under pressure. Pressure wash is a bad idea unless disassembling.
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falcor75
post Oct 23 2017, 04:59 AM
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Ice pellet blastning should work, havnt tried it myself yet tho.
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McMark
post Oct 23 2017, 06:11 AM
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If not disassembling, slow, tedious, meticulous cleaning.

Pull the stack and diff, then soda blast. Then you only have to manually clean the intermediate plate. Plus you can inspect the internals in case something should be attended to now (perhaps something melted inside?).
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76-914
post Oct 23 2017, 09:09 AM
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QUOTE(Dr Evil @ Oct 22 2017, 07:22 PM) *

Oven cleaner is fine, I have run tests with it over months with no pitting. Old wives tail. Likely the best fit for your situation. You should pull the stack and wash the cases thoroughly. If I can help, let me know. What ever I have to give is yours.

(IMG:style_emoticons/default/av-943.gif) (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/shades.gif)
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Eric_Shea
post Oct 23 2017, 09:29 AM
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Walnut
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914_teener
post Oct 23 2017, 09:31 AM
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.....and bake at 450 degrees until done (IMG:style_emoticons/default/smile.gif)
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bretth
post Oct 23 2017, 10:53 AM
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Wouldn't the whole case be warped depending on how close the cases were to the fire?
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914_7T3
post Oct 23 2017, 03:10 PM
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QUOTE(Dr Evil @ Oct 22 2017, 07:47 PM) *

QUOTE(914_teener @ Oct 22 2017, 10:38 PM) *

QUOTE(porschetub @ Oct 22 2017, 02:02 PM) *

Block off the case breather with duct tape,brush non caustic degreaser on and waterblast them.
A big NO to the oven cleaner as mentioned,how these clean up will most likely indicate how hot they got,@ minimum I would replace the input shaft and output shaft seals.



If one water blasts it and doesn't pull the stack.....the gears will rust.

Ask me how I know.

Water will get in the side seals and other parts under pressure. Pressure wash is a bad idea unless disassembling.



Oooops, looks like I just screwed that up!

(IMG:style_emoticons/default/sad.gif)

Now going to add a rebuild to my resto to do list. Had a few small random issues with first gear and the down shift to second at times, so now whether or not to split open the transmission case has just been decided.
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whitetwinturbo
post Oct 23 2017, 07:30 PM
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Test ZEP 505 on small sample.... (IMG:style_emoticons/default/smile.gif)
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Mikey914
post Oct 24 2017, 07:12 AM
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Do look for crystallization of the aluminum. Of you see this you will probably not want to bother cleaning as the case will be shot. The internals should be fine.
No point in cleaning if it's garbage.
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Mikey914
post Oct 24 2017, 07:14 AM
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The only reason I mention this is I was with Rob and Chris yesterday and saw how hot the fires burned, aluminum will harden, but once the metal gets too hot it's done.
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914_teener
post Oct 24 2017, 07:51 AM
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Ah....the tranney case is magnesium.
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iankarr
post Oct 24 2017, 09:00 AM
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I have a spare case if anyone needs one.
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Dr Evil
post Oct 24 2017, 06:07 PM
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QUOTE(914_teener @ Oct 24 2017, 09:51 AM) *

Ah....the tranney case is magnesium.

Ya....unless you are talking 1969 and older 911/912
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pete-stevers
post Oct 24 2017, 09:26 PM
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Thanks Mike!
one of these trannys was rebuilt at a clinic the other was a good tranny from the 914 that burnt ... They both where out on a steel shelf a ways from the heat of the fire, there was a wooden table close by that was blackened but was not burnt.. So the order of business is just to take the black crap off of them... But I see pressure washing won't be a very good way... I dont really want to disassemble them... but we will see
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