Subaru Robin PKX201 - Manual (Page 29)

Centrifugal Pumps - PKX Service
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1. Drain water from the reservoir and remove the 4 bolts
that hold the outer casing to the pump back plate.
2. Remove outer casing and volute as an assembly. Tip
backwards not allowing the volute to drop out of the
casing.
3. Note the locating slot that is cast into the volute. This
must align with the notch cast into the outer casing
when re-assembling.
4. Tip the outer casing on its back and pull out the volute.
If the O-ring, on the back side of the volute causes the
volute to stick when trying to remove, use two hands to
lift out the volute, while holding the outer casing