I am swapping out my alternator for a passenger side GM one wire, and
have a question for the veteran machinist crowd.
The alt bracket (from an early car) has .320 thru hole. The new alt and
the steel triangle support on the front cover have .390 thru holes.
(clearance holes for 3/8" bolt) While I know I can get a bushing to take
up the large hole in the alternator/support, I am still left with a
really long, reallly thin thru bolt. How about running a tap into the
alt bracket and just bolting to it? My Machinist manual is in a box,
does anyone know the preliminary hole size for for 3/8 Coarse or Fine
threads? In other words do I have to pre-drill to larger diameter or
just tap out from the existing .320? If the fwd end of the alt was
unsupported I wouldn't consider it, but but I am already having a time
trying to find M8-1.25 x 100mm bolts for the triangular bracket back
onto the front cover (100mm due to add'l .800 spacers to line up the
belts). Sorry, too many questions at once. Fergus O, roadster in
hibernation, HB, CA
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