I had replaced the water pump with a generic parts store replacement (probably a reman, upon retrospect) and I found during the RallyCross that the shaft/bearings were defective. So I ordered a OEM-quality Nissan replacement and got it installed today! Thankfully the owner of an 18-wheeler shop let me inside his garage to work on it as it was seven degrees outside!
Preparing to remove the defective unit.
Coolant drained!
Pump removed, thankfully despite the tight engine bay I was able to finangle it out.
The defective water pump (named Walter Pump) where it belongs - not on the engine!
New pump installed
With pulley, belt reinstalled and put back together.
Ready for action! Next race is on Saturday, February 2nd!