On Sat, 13 Apr 2019 11:50:09 -0500
Terry Coombs wrote:

It was oh so well fitted in the '39 tranny case ... the main clutch
gear/thrust bearing race . Had a perfect fit , rolled smoothly ,
everything was going oh so well . But then I found a 1940 trans that was
pretty much complete , and a lot of the parts were in better shape than
the '39 trans I had . Two factors influenced my decision to swap to the
'40 case , there's a (non-critical) piece broken off the '39 , and the
'40 has a spring loaded ball and detent system to lock the shifter drum
. So I pressed the race out of the '39 case and into the '40 . And all
at once the rollers didn't fit so well . Clutch gear wants to walk into
the case when rotated one way , out of it when turned the other . Turns
out the hole in the case is egg shaped , .0015" wider than it is tall .
So here's the question : I want to set the case up in the milling
machine and use my boring head to make it round . This will take about
.00075" from the top and bottom , and I'm worried I won't have as tight
a press fit as I think is needed . So I'm wondering if using a Loctite
sleeve retaining compound will be acceptable to keep things stationary .
Having that race spin in the case would be a Very Bad Thing ... My other
option , is to repair the '39 case and re-machine the shift cam plunger
hole to accept the '40 spring plunger assembly . Shift cams are the same
except for the locking area and will swap . I'm finally getting to a
point that I have room to work on at least the sub-assemblies to get
this bike back on the road . I'm not worried about "ruining" original
parts , this bike is a mutt anyway and a modified part that I can use
beats a broken part any day .


Could you build the worn egg-shape area up via TIG and then machine to
proper size? Even if not perfect it would give you solid material on
four sides for the press fit and maybe some loctite too for insurance...

--
Leon Fisk
Grand Rapids MI