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Ive successfully welded two crankcases myself using TIG welding process, but i must warn that its not without risk due to:

1) The aluminium quality can be variable,
2) Porosity in the aluminium, and
3)Contamination with oil,

Each of the above factors makes the task challenging and i think that you’ll struggle to find a welder who will accept the associated risks due to the potential destruction of the crankcase, that was what i found and is why i tooled up to do it myself.

If you would like me to have a look at yours send me some photos and i’ll take a look and advise,

Feel free to PM me or post your email address.