John,
I had one leg of my TR4 generator snap off so I had it arc welded (aluminum),
filed it down smooth and it worked great. Point being - welding aluminum
seems to be OK.
My original bell housing had two bashed holes on opposite sides (about size
of silver dolllars) most likely prior owner wanted to spread open a stuck
clutch. I never had any problems with further cracking and I put over 100,000
on it. (I screwed on copper sheet metal covers over each hole)
Standard-Triumph specifically made the lip on the bell housing thicker in
later production and added more reinforcing ribs.
While I never had any further cracking problems with my early thin lipped
tranny case - most folks recommend the later one if available.
Carl Sereda
'63 TR4 since '74 - CT22326L
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