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bucket o' cox's - 1/27/2010 10:31 PM   
flyinrog



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Status: offline 		soakin in rubbing alcohol, the 4 I got at the swap meet and some others I had laying around that had gotten gummy...all of them freed up fine except one,,a blackwidow from the swap meet, I finally got the piston out and it was rusted to the cylinder!! I'm guessing its no good and I cant get the head off the cylinder anyway....just another parts engine I guess...never saw one rust up before,,seen em gummed up bad, but not rusted...Rog

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RE: bucket o' cox's - 1/28/2010 2:28 AM   
Jaspur_x


 

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Status: offline 		I got a peewee 020 once that was like that. I used wd40 on it to free it up. I had to use the cox wrenches to get the glowhead off , then I let it soak in wd40 for about a week.
Next was a lot of clean up , but I did get about 2 years out of it after that.

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RE: bucket o' cox's - 1/28/2010 2:50 AM   
icerinkdad



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Status: offline 		It was likely run on fuel with little or no castor oil. That would strip any protective castor off the piston and cylinder and could result in rust.
Bob

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RE: bucket o' cox's - 1/28/2010 3:02 AM   
flyinrog



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Status: offline 		Well,I took the torch to it, heated it up and got them apart...took a tube cleaning brush from ex-work and some oil and got it turning over again,,still need to take it apart and clean it up...Rog

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RE: bucket o' cox's - 1/28/2010 3:36 AM   
flyinrog



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Status: offline 		Its junk,, epoxy in 2 places on the tank, mylar reed doesnt seal, somebody got there money's worth out of it, it looks like, I might could make it run, but not sure its worth trying....Rog

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RE: bucket o' cox's - 1/28/2010 5:29 AM   
DeviousDave


 

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Status: offline 		A strong concentrated mix of tea will dissolve rust over a few hours (maybe overnight).


give it a shot.

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RE: bucket o' cox's - 1/28/2010 6:23 AM   
gkamysz



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Status: offline 		I had an NOS TD.049 piston cylinder set that rusted on me. I did the tea trick as opposed to other rust removal options, but I don't think it will last. The surface just isn't going to be the same.

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RE: bucket o' cox's - 1/28/2010 6:41 AM   
flyinrog



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Status: offline 		Well, while born in the north, and raised in the south, I dont drink tea, tastes like cold weak coffee...cant stand it,,I do love hot black coffee though...I guess a neighbor might have some,,..Rog

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RE: bucket o' cox's - 1/29/2010 7:52 AM   
Doc.316


 

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Status: offline 		Well, you could try the rust removal by electrolysis method....I have never tried it on a model engine though...(knives/planes (hand)/pulleys/tools)...

1. Get a bucket (for an cox a big glass would work)
2. Get some steel electrodes...(for a small 049 you wouldn't need a very big ones) I normally use 4.
3. Suspend the part in the middle of the bucket (or big glass) with a wire.
4. Throw in some water and some washing soda...(from the washing section of the store).
5. Hook a 12V battery charger to the electrodes and the wire suspending the part in the solution.
6. Turn it on.

The rust will magically be removed...

Steve

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RE: bucket o' cox's - 1/29/2010 9:14 AM   
proptop



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Status: offline 		This stuff seems to work pretty good too...

http://www.evapo-rust.com/

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RE: bucket o' cox's - 1/29/2010 6:13 PM   
gkamysz



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Status: offline 		Evaporust is OK, but it dulls all the parts and will remove the black oxide on the cylinders.

Electrolytic rust removal works, just make sure you connect the part you want to de-rust to the negative terminal.

Coffee is supposed to work too, but maybe you need real coffee and leave the grinds in the cup. It's been a while since I read about that.

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RE: bucket o' cox's - 1/29/2010 6:29 PM   
proptop



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quote:

ORIGINAL: gkamysz

Evaporust is OK, but it dulls all the parts and will remove the black oxide on the cylinders.






Thanks for the warning...so far, I have only used it on a few larger glow engine cranks and wrist pins...things like that...but it did work well.

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RE: bucket o' cox's - 1/30/2010 3:45 AM   
Doc.316


 

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Status: offline 		Oh...sorry about not mentioning the neg. terminal...that is important! Thanks GKamysz...! You wouldn't want MORE rust on it would you...lol

Steve

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RE: bucket o' cox's - 2/2/2010 4:27 PM   
longdan



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Status: offline 		Devious Dave

Tea you say? Thats a new one to me.

I've done the antifreeze boil, the WD40 soak, the dishwasher wash and other methods to clean / unseize engines, but never heard of using tea. Do you just throw a few tea bags in with the engine and a bit of water? I've heard that tea contains anti-oxidants, but never figured that property could be applied so directly to a rusted engine.

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RE: bucket o' cox's - 2/2/2010 5:00 PM   
Mr Cox



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Status: offline 		How about Coca Cola...?

It sure attacks teeth and as a kid I was told that if you put a tooth in that stuff it will disappear...

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RE: bucket o' cox's - 2/3/2010 1:56 PM   
tipstall 131



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Status: offline 		How about soaking it in brown vinegar? I did that with some rusted wrenches and it cleaned the rust right off.

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RE: bucket o' cox's - 2/3/2010 3:15 PM   
gkamysz



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Status: offline 		Supposedly tannic acid in tea (and coffee) dissolves the rust. Some sources say that tea doesn't contain tannic acid but tannins. Whatever the mechanism it does work. It's not very aggressive and takes hours. It does a nice job if you aren't in a hurry. You have to clean the oil of castor sludge off before putting the part in your favorite cup. I used 2 or 3 bags in a cup when I tried it. Black tea or green tea.

Coca Cola derusting is a myth. It's also said it will clean your toilets. It doesn't do that either. It does contain phoshporic acid, just not enough to do anything other than give it some flavor.

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