Subaru Robin PKX201 - Manual (Page 69)

Semi Trash Pumps - PKX Service
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33. Pour a little liquid detergent on the backside of the
impeller before trying to install the rotating seal.
34. Push seal into cavity with one or two thumbs making
sure the seal is seated correctly.
35. Reinstall the impeller and hand tighten on the crank
shaft. Make sure it is threaded on all the way. If
impeller is not threaded on the full depth, the impeller
face could strike against the inside of the volute.
36. To make sure the impeller is installed correctly hold
the volute against the backplate and check the
clearance with a feeler guage. If the clearance is
larger that 0.040 in., then another shim must be
added. If there is less than 0.020 in of clearance
between the volute and impeller, then it is possible a
shim would need to be removed.
Note: make sure impeller is threaded tightly
against backing plate.