Subaru Robin PKX201 - Manual (Page 76)

High Pressure Pumps - PKX Service
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5. Inspect the volute for damage. Check for cracks or
bent castings. Note: the locator casting marks in
volute. These marks need to be placed between
cast in notch in outer pump casing when reinstalling.
6. Check condition of O-ring on volute. Check for
nicks, cracks and gauges. Defective O-rings will
cause poor priming and loss of pump performance.
7. Remove impeller with 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 quickly when
reaching the end of the threads. Use two hands if
necessary. Watch for loose parts such as the shims.