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Just an update on the Dennis Carpenter kit for the 37 to 48 Water Pumps.
There was nil instruction with the kit.
Simply based on your name, I was unable to find a record of previous sale of these repair kits. However, that is a mote point as I assume you are inquiring about the 78-8591 repair kit which does include the tapered, aluminum pin. This pin is used as a temporary "locator" to adjust the depth of the press fit into the impeller. You simply insert the smooth (small end) of the pin into the corresponding hole in the shaft. Press in only far enough that splines on the larger end of the pin engage enough to keep the pin from falling out. The shaft is then pressed into the blade side of the impeller to just before the pin touches the impeller body. Be sure to leave enough room to push the pin back out as there is a small shoulder around the inner diameter of the impeller body. That's basically it, the pin is simply a 'single use" positioning device. Please be aware that these kits are for repair of original pumps only and will not work on our newer design 78-8501-N & 78-8502-N pumps which have a larger diameter shaft.
Could be of assistance for others.
Phil NZ