I have made an interesting discovery with regard to the type of 3 shoe
clutch sold springs stretched across the bell side. As I mentioned earlier
here I've had heat related issues with spring failure on this sort of
clutch. Now I've found an effective way to eliminate the problem. These
clutches only fully engage at about 4500 rpm,(19 mph for me). What
this means is that every time I accelerate or slow down that clutch is
slipping and only partially engaged, creating a lot of heat in the bell which
decays the temper of the springs. Add to this the fact that only two
points on the spring are actual in contact with the connecting hole in
the shoe.(see attachment)
Fear not! there is an easy solution to the problem. Using a cone-shaped
diamond dental bit in my dremel I rounded off the right angle inside edges
of the spring connecting hole. Stress is now distributed evenly through
the curvature of the spring, and, as an added bonus, tension on the spring
has been slightly reduced allowing full engagement at about 3800 rpm.
WHEW!
Hmm... it sez my attach. is to large to enter & I'm havin a helluva
time trying to get it reduced. Hope my description will be enuff to
get it across.