Porous weld repair

[hendy]

Following a conversion of my engine casings to 200 spec, I've found a leak when I rebuilt the top end.

This leak is due to pin holes in the weld which have 'linked up' to form a leak from the area behind the spigot and into the stud hole.

I was just going to plug them up with jb weld, but now I'm wondering if that's a good enough job as I've no experience of the stuff. Maybe I'd be better using some of that fluxless aluminium brazing, but again I've never tried it.

Can anyone advise?

[holty]

aluminium is not easy to weld, i wouldnt try, its best left to experts in my opinion, i think your idea of jb weld should do a good repair if it only litttle holes, i would then use some stud lock on the stud as well, maybe a smear of gasket sealant on the gasket as well, then do a leakdown test afterwards, only other option is to send it back to be fixed by the company that convered it, good luck.
holty

[hendy]

Thanks holty, yes they're just small

3 small ones on the inside behind the spigot about 1 or 1.5mm diameter and one on the outside about the same size.

I've no idea which of the inner ones is part of the leak path (maybe all three), so I'll just plug them all.

I've already used gasket sealant (threebond 1215) and nutloc in the threads.

I really don't want to send the cases back. Partly because I can't be arsed but mostly because I'd have to strip it again and wait for him to turn it round.

[warts]

Aluminium isn't all that difficult to weld for anyone claiming to be a professional welder - you just need to know what you're doing and give a s**t about the quality of the outcome.

In your shoes, I'd go the JBWeld path. Give a good clean inside the holes with something like a dremel,

[Muppet]

good and made for aluminium http://www.itw-devcon.co.uk/index.php?/ ... m_putty_f/