Subaru Robin PKX201 - Manual (Page 77)

High Pressure Pumps - PKX Service
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9. Inspect the impeller for defects.
10. Remove the spring from the crankshaft. Note: 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
according the re-shimming procedure noted later in
these instructions.
12. When 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, re
place with new one(s).