Subaru Robin PKX201 - Manual (Page 13)

PTG109 Service
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33. Tighten the impeller with a rubber mallet by hitting on
one of blades in a clockwise position until tight.
34. The casting marks on the pump back plate indicate
where the volute must be placed. Make sure that the
volute is placed correctly inside these marks.
35. After installing the rubber gasket on the face of the
volute, place the volute on the pump back plate. Tip
the unit back slightly to hold it in position.
36. Make sure there is enough clearance between the
volute and impeller, use a feeler gauge to check the
gap. While holding the volute tightly against the pump
back plate, insert different size feeler gauge blades
until the correct reading is obtained.
The recommended clearance is 0.024 to 0.039
thousands of an inch.