Rusted Forks??

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Rusted Forks??

Postby RubenS » Thu Aug 22, 2013 3:57 pm

Hi Folks,

I am repainting an old steel frame bike. The forks have a small drainage holes on the tubes. When washing the paint stripper off some water got in, and when draining it, out came some rust flakes along with rusty water. I have had them soaking vinegar to remove the rust, and have then sprayed in some WD40 to try and stop anything reoccurring.

my questions are... How do I know how structurally sound the forks are? assuming they are good, what can I do to ensure stays that way???

http://www.flickr.com/photos/superub/9565961207/sizes/c/in/photostream/

Thanks
Ruben
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by BNA » Thu Aug 22, 2013 10:16 pm

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Re: Rusted Forks??

Postby Dragster1 » Thu Aug 22, 2013 10:16 pm

you can do a ultrasonic thickness measurement test not cheap and also tap them with a solid screw driver end all the way along and listen for irregular rings. The first is a better option
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Re: Rusted Forks??

Postby mick243 » Thu Aug 22, 2013 11:08 pm

Wd40 won't stop the rust recurring long term. Make sure you wash all the vinegar out too, as acids generally promote rusting
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Re: Rusted Forks??

Postby RubenS » Fri Aug 23, 2013 6:50 am

Thanks guys, yeah vinegar is out... i did the screwdriver test and they sound pretty uniform. the rest of the frame is in pretty good condition so I pretty confident about the forks as well.
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Re: Rusted Forks??

Postby WyvernRH » Fri Aug 23, 2013 10:27 am

Also, when you are happy that all is dry inside the forks, block up the holes with filler, Araldite, whatever. This stops more crap getting in and limits the amount of Oxygen available for rust formation to the small amount in the sealed tube (assuming the builder did his job properly at the fork crown..)
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Re: Rusted Forks??

Postby OnTrackZeD » Fri Aug 23, 2013 7:52 pm

You spray the inside with 'Fish Oil' this will stop rusting and when dry can be painted over. Any good auto shop has it.
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Re: Rusted Forks??

Postby RubenS » Fri Aug 23, 2013 8:21 pm

Thanks for all the help.

Think I will go the fish oil and then seal it all up. Pretty confident rust is sorted now.

here are some more pics if anyone is interested.... how it looked when I got it and a few of the frame as a work in progress...

http://www.flickr.com/photos/superub/se ... 198693454/

Thanks again

Ruben
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Re: Rusted Forks??

Postby RubenS » Fri Aug 23, 2013 8:23 pm

Oh and if anyone has any information on the frame that would be appreciated as well. Dont really know much about it, as it was bought as a present off gumtree.
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Re: Rusted Forks??

Postby Mulger bill » Fri Aug 23, 2013 8:26 pm

Columbus dropouts, doubt she's a junker. Nice score. :)
...whatever the road rules, self-preservation is the absolute priority for a cyclist when mixing it with motorised traffic.
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Re: Rusted Forks??

Postby cooperplace » Mon Aug 26, 2013 12:02 am

WyvernRH wrote:Also, when you are happy that all is dry inside the forks, block up the holes with filler, Araldite, whatever. This stops more crap getting in and limits the amount of Oxygen available for rust formation to the small amount in the sealed tube (assuming the builder did his job properly at the fork crown..)

limits the amount of oxygen? doubtful.
Please be nice to me, I'm not very bright.
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Re: Rusted Forks??

Postby WyvernRH » Fri Aug 30, 2013 8:04 am

cooperplace wrote:
WyvernRH wrote:Also, when you are happy that all is dry inside the forks, block up the holes with filler, Araldite, whatever. This stops more crap getting in and limits the amount of Oxygen available for rust formation to the small amount in the sealed tube (assuming the builder did his job properly at the fork crown..)

limits the amount of oxygen? doubtful.


Why? The tube is (should be) sealed at both ends with brazing metal, steel and bronze aren't permeable to air.
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Re: Rusted Forks??

Postby Duck! » Fri Aug 30, 2013 8:33 am

Not so. Many forks have a small breather hole near the tip of each blade on the inner side.
I had a thought, but it got run over as it crossed my mind.
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Re: Rusted Forks??

Postby rkelsen » Fri Aug 30, 2013 10:42 am

^ FYI, the guy you just corrected is a frame builder.
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Re: Rusted Forks??

Postby WyvernRH » Fri Aug 30, 2013 12:21 pm

Duck! wrote:Not so. Many forks have a small breather hole near the tip of each blade on the inner side.


That's why I suggested the chap 'block up the little holes' in my original post.. :wink:
Actually, if you are good you can do without breather holes and those that use them often seal them up.

Cheers
Richard
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