[Mart]

It looks like a fatigue crack heading up towards the centre of the tank.

I just soldered a repair on my 33 tank where it had cracked. I used a section of copper pipe and split it out to make a small sheet. I soldered it over the crack and made what I would consider to be a good repair.

If you want to try soldering it, don't try and do it with the rad in place. Take it off and clean it meticulously. A wire wheel in a drill works good. Abrasive paper and wire wool is good too.

Lay the rad down so the area to be soldered is horizontal. Cut your patches. Clean everything to bright metal.
Put solder on the radiator and then put the patch over and heat it until the solder melts and the two fuse together. Then carefully apply solder around the edge to make sure.

Use lots of flux before and during the job.

I did take some video of my repair but it will not be ready to put on youtube for a while yet.

I took my rad from having multiple leaks to holding water nicely.

If your repair does not work, two minutes at a radiator shop will have your failed repair melted off there and they can have a go. In other words you won't screw it up for them by having a go first.

Mart.