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P.U.M.P can fulfill your requirements in any pumping application and have the job more.Changing the raw water pump impeller on a Kohler 5E marine generator is actually very easy as long as you can fit in the small work area where the pump is.
Remove the four 1/4" bolts that fasten the pump to the generator.
The only things you really need to take off of the pump is the cover with the o-ring and then get the old impeller out of the pump.You might have to slide to pump partially off the drive shaft and then back into position to get the impeller to stick out a little so you can grab it with your pliers.
Check the rotation of the pump by touching the start button on the generator control panel and observe which way the shaft has moved or if the impeller still has vanes on it install the new impeller with the vanes running in the same direction.The next thing to do is to install the impeller in the pump.
The easiest way of getting the impeller in the pump is to pull the pump from the generator a little bit, place the impeller on top of the pump and twist it in the proper direction to get it started (vane tips are trailing rotation) then align the impeller with the flat(s) on the drive shaft and slide it into the pump body.
After the impeller is installed the o-ring needs to be placed in the groove in the pump housing with a little bit of lube on it and the cover replaced with the bolts and tightened.When the cover is in place and tightened it is time to open the valve for the water intake, checking for no leaks.