Rusty tank

Questions regarding the DR800

Rusty tank

Postby Philo Beddoe » Wed Aug 01, 2012 1:31 pm

OK, I know it's a common woe with these things & Big Bob has probably explained it all before; but here goes:
The inside of my 1991 tanks are a bit rusty, I tried the method of gravel & then rust treatment, but with limited sucess. I spoke to a company that specialise in BMW Paris -Daker tanks & they said to try getting it acid dipped (my tank needs a re-spray anyway).

Any thoughts on this?............
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Re: Rusty tank

Postby nug » Wed Aug 01, 2012 6:19 pm

You can do it yourself by filling the tank with the appropriate dilution of Oxalic acid or alternatively by using electrolytic methods all of which are well documented on the tinterweb.
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Re: Rusty tank

Postby BigBob » Wed Aug 01, 2012 10:43 pm

1991 tanks are a bit rusty

But the 1991 model only had one tank :?
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Re: Rusty tank

Postby Philo Beddoe » Mon Aug 06, 2012 10:01 am

Ooops...mine is a 1990. Bit of finger trouble with the typewriter thingy! :oops:
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Re: Rusty tank

Postby Longman » Fri Oct 19, 2012 6:58 pm

Bit late, but this man seems to know his onions. I'll be doing this on my rusty tank in the next week or two.............
http://www.realclassic.co.uk/techfiles/ ... moval.html
Last edited by Longman on Sat Oct 20, 2012 6:43 am, edited 1 time in total.
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Re: Rusty tank

Postby nug » Fri Oct 19, 2012 7:16 pm

Its nasty stuff but will do the job, including stripping paint & skin !
One thing to note is....using this method on a stressed item can cause hydrogen embrittlement so I wouldn't do it on a frame or suspension parts etc. These parts are better suited to the Oxyalic acid method although it will not remove paint.
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Re: Rusty tank

Postby Longman » Fri Oct 19, 2012 9:11 pm

Yeah, looks dodgy, rubber gloves, eye protection and done outside................... :) That's the way, but thanks for the warning. Tank will be sprayed after the de-rusting :tup:
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Re: Rusty tank

Postby nug » Sat Oct 20, 2012 9:40 am

Why did I just get a picture in my head of you filling the bath with caustic soda....... :crazy:
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Re: Rusty tank

Postby BigBob » Sat Oct 20, 2012 10:53 am

A word of caution.......
The spigots that take the fuel lines on the bottom of the tank are brazed in place, so be mindful of the metallurgy when using strong corrosive compounds.
If you were to cut open the tank, you`ll see that on the inside the fuel pipe is curly wurly like a piggy tail corkscrew with a number of turns.
Using the method you propose could well block these with any sludge formed and you`ll never be able to unblock them as you can`t poke a bit of wire up its wotsit, as it were..........
Most of the rust comes from the filler cap area of the tank or just below it, usually when stood for a length of time, so check carefully as perforations in this are are not unknown
Having fuel draining out of a hole on to a hot engine contravenes Elfnsafety I believe ;)
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Re: Rusty tank

Postby Longman » Sat Oct 20, 2012 12:19 pm

Thanks BB, I didn't know that. Is there a better way to sort out my rust problem ?
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