It seems to me that you are referring to the 2nd type (brass eccentric cam) I believe the K3 would originally have had a 1st type (iron oscillator cam) If so, there is an internal pin in the oscillator cam, To remove this pin, after removing the sheer pin (which drives the propeller) raise the oscillator cam up the prop shaft so that pin aligns with holes in oscillator cam and push pin out. There should be a spring between sheer pin and end of oscillator cam to prevent cam from moving up shaft during operation.
If memory serves the sheep pin is 3/16″ and the oscillator drive pin is
3/16″ .Both pins can be made from 3/16″brass rod using a file and small vise.Getting length right on internal pin is a fit and try, Sheer pin
Finding brass rod can be a now you see it and now you don’t proposition. .I bought a 3 foot length of 3/16″ at Lowes and have not
see it there since..I was at Tractor Supply and found one 3/16″
brass rod in the rack…It appears that both stores do not restock when
sold out. Cutting brass rod to exact length can be tricky,,,,best to cut
a little long and file to fit. Sheer pin can be fit to length of slot
inside hub or propeller, same rounding of ends and reduction
of diameter applies.
Servicing a water pump usually involves making replacement pins,
3/16″ brass rod may also be used to make High Steed needle for AJ
series carburetors and an assembly tool to hold rod cap in place with
the needle bearing steel rods
Measure from end or rod to cutting wheel for length, the cut end(s) will be slightly thicker. Chuck in poor man’s lathe (electric or manual drill) to round ends and reduce the raised diameter.
Louis
