HI folks, my oil tank was leaking from the rear bracket. Tank seems sound with no rust inside or out. I expected to find a crack from vibration, however it almost seems as though the oil was coming from under the weld. It was clearly coming from one point (at the arrow). Best to just braise it up?
3D TV: A format that lost a format war without even having an opponent. Bikes: '69 T120 on average (1967 rolling frame and 1971 Bonnie engine) + '56 1/2 T110 on average (58 rolling frame - with 55 iron head engine) + 74 T150 Home model.
If that black spot is the hole, then I agree with Kommando, I would not braze there. One zap with the mig welder is what I would do. I think that is easiest for the thin sheet used here and requires less skill. Access might be a problem for any type of welding process, I'm not sure from the photo. That is an excellent photo, by the way.
I would normally favor brazing for a repair such as this. However: -- Kommando is correct--if you try brazing and it doesn't work you have loused up if you then try to weld it. -- You need to get it oil free and that is difficult.
Why would I prefer brazing? Because welding can leave the part brittle and liable to vibration cracking in further service. Just my motorcycle engineering apprenticeship from a wizened old Welshman ---one of the best engineers I have ever met--and never spent a day in college. His words "Never weld anything on a bike---just braze or Sif-Bronze weld"
My experience exactly Tridentman....we would weld the tanks and it always cracked around the welded area. Tried MIG and TIG with the same result. Brazing doesn't need the same heat. And tanks I've repaired have stayed repaired. BTW, the MIG weld actually cracked as it cooled. That tank is just too thin and going by the shape we thought probably stressed.