Remove the flange (Item 1) [Figure 70-50-18].
Press the shaft (Item 2) and impeller (Item 3) [Figure 70-50-18] out the impeller side of the water pump.
Remove the impeller (Item 3) [Figure 70-50-18] from the shaft.
Remove the seal (Item 4) [Figure 70-50-18].
Install a new seal (Item 4) [Figure 70-50-18] when assembling the water pump.