sand inside frame

General cycling advice ( NOT technical ! )
wearwell
Posts: 307
Joined: 3 Feb 2011, 8:45am

sand inside frame

Postby wearwell » 30 Jun 2016, 4:46pm

Stripping down to find why headset failing (Stronglight O'light AL 1 1/8") only to find head tube and fork tube have thick layer of pinkish sand all over. Some has descended into the lower bearing and knackered it.
But how could it have got there? There are only two small holes where head tube meets frame tubes. Otherwise completely closed. Couldn't have found it's way in past the bearings.
It looks to me like this could only have been there from the beginning. Sand blasting or casting sand perhaps?
Anybody experienced this?

NB I haven't cycled anywhere near a source of fine pink sand! This is a road bike - a few miles on good trails is as rough as I go.

PS I now recall that the same sand was in the bottom bracket shell when I serviced it a year ago.

hamster
Posts: 3202
Joined: 2 Feb 2007, 12:42pm

Re: sand inside frame

Postby hamster » 30 Jun 2016, 4:59pm

Sounds like blasting residue...unless you bought it in Libya...

gerrymcm
Posts: 446
Joined: 30 Oct 2012, 2:52pm

Re: sand inside frame

Postby gerrymcm » 30 Jun 2016, 9:29pm

This happened to me with a second hand frame, which had been freshly powder coated. Fortunately it was bead blasted so was easy to hear so I had a chance to clean it out before us.