Subaru Robin PKX201 - Manual (Page 30)

Centrifugal Pumps - PKX Service
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6. Check the condition of the O-ring on volute. Check for
nicks, cracks and gouges. Bad O-rings could cause
poor priming and loss of pump performance.
5. Inspect the volute for damage. Check for cracks and
bent
castings.
7. Remove the impeller with a hard rubber mallet. Hit one
of the blades in the counter-clockwise position. It is
best to not block the engine for this procedure.
Only use a fl ywheel strap when it does become
necessary.
8. Slowly turn the impeller off the crankshaft. Watch that
the impeller does not drop off the crankshaft when
reaching the end of the threads. Use two hands if
necessary.
Watch for loose parts such as the spring, or shims.