I think I made progress today getting the Sierra 18-3072 impeller swap pumping.
I shortened the impeller cartridge to match the impeller height, plug a hair
for a little “squash”. Also, I drilled a tiny hole in the housing just above the water pump,
near the suction side, in case the pump was getting air locked. It’s all back together now,
and hope to barrel test it tomorrow.
Impeller in cartridge. Cartridge is now machined down so the impeller has
a little “squash” when the cover is down tight.
VIDEO….
https://youtu.be/mdnEldlSG6g
Drilled a little “vent” hole here so pump can’t be air locked
when the motor is lowered into the water. Probably not
necccessary, but I was getting desperate!
Prepare to be boarded!