Subaru Robin PKX201 - Manual (Page 19)

PKV101 Service
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12. Remove the shim(s). Count the number taken off and
make sure to replace the same amount when reinstall-
ing.
9. Inspect the impeller for cracks in the casting or chips in
the
blades.
10. Remove the spring and set aside.
11. The shim(s) should be located over the crankshaft in
this
position.