I used scrap leather that was on hand. I found that when soaked with
Neetsfoot oil, the leather relaxed an formed into a torus shape easily
when installed. Thicker leather might also work. Only advice I can offer
regarding a tight belt is Diet and Exercise…aka Starve ans Sweat.
A torus is like Bunt cake pan,
A few comments back, the question of a spring being needed with the
16 square hole water pump…I now believe the question relates to the
use of a spring circling the cam over the pin.
That depends…if the original unaltered cam is used the answer is NO
However, that is not the whole story…the 7 slit type oscillator AND the
Impeller Drive Hub of 3 slit each have a groove around cam or drive hub over the holes for pin in each. When set up for use with the rubber
clutch a long pin is passed thru the Impeller Drive Hub or the
7slit oscillator cam…in this case serving as both drive pin and sheer
pin. IF clutch is not used then a short pin is installed in Impeller Drive
Hub or 7 slit oscillator cam, this pin is short enough so as not to
protrude into groove and the circular spring is snapped into the groove
securing pin in place. Propeller is driven by sheer pin installed in the
other hole in prop shaft.
Since the 16 square hole oscillator cam design locates the pin holes
differently the circular spring would not work even if the cam had
a groove machined.
Now the kicker, since the holes in all prop shafts for Early K Models,
installing 7 slit impeller in 16 slit water pump is doable, the circular
spring would be needed. I suspect the clutch might also be retrofitted
excluding need for short pin and spring. I have not done a fit or try
so this may or may not be so. I do have a water pump with the
cam swap and I am looking for a circular spring of right size. The clutch can NOT be used with the original unaltered oscillator cam
due to the way pin and cam interact.
It is an interesting fact that one prop shaft part # served all three
water pump with or without the clutch. A lot of forethought went into
a seemingly simple item.
I believe all the above opinion is in agreement with the facts.
Louis
