Subaru Robin PKX201 - Manual (Page 31)

Centrifugal Pumps - PKX Service
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12. If the shim(s) get stuck inside the impeller. Carefully
pry the shim(s) out with a small screwdriver. If
shim(s) get bent or are fl attened beyond use, replace
with new one(s).
10. Carefully remove the spring from the crankshaft. It can
be replaced in either direction.
11. Remove the shim(s) from the crankshaft. Count the
number that is used and replace with the same
amount. Should the impeller or volute be replaced
with new, it will become necessary to re-shim accord-
ing the re-shimming guide located in service manual
9. Inspect the impeller for defects.