Originally Posted by
Andrew R Stewart
Dirt usually doesn't produce a rattle. Flux that has dislodged from the joints does. I would first consider a bath. Completely strip the frame and expose every vent hole possible. Soak wit the hottest water you can. Follow up with solvent as best you can. Dry out with heat of some low level. End with Frame Saver. Then consider sew up glue... Andy.
So I have this same situation, but it is mostly rust. It was suggested that it was flux, but today I filled the fork with 160 degree water straight from the water heater that is set to kill for washing and let it set for about 6 hrs. anyway a lot of rust came out and there is still rattling but a lot less. Only one vent hole on each side, but I was able to use a big needle to get the water in and then to get most of the water out with compressed air then dried the rest with the furnace in the garage. The seat stays are the same, only one hole and a lot of rattle so I will go after them too the main tubes are not too bad from what I can see with the borescope. It seems to me that rust converter would be the way to go and then maybe framesaver or such. Thoughts?