Subaru Robin PKX201 - Manual (Page 18)

PKV101 Service
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5. Turn the volute over and check the O-ring for nicks
or cracks. Damaged O-rings can cause loss
of pump prime as well as pumping performance.
6. Check O-ring on the back plate for nicks or cracking.
It should be soft and plyable. When reinstallling,
clean surfaces free from corrosion, and apply dish
washing soap for easier installation.
7. Remove impeller by hitting one of the blades counter-
clockwise with a soft mallet.
8. After the impeller is broken lose, slowly turn the impel-
ler couter-clockwise. Make sure any loose parts, such
as the spring and shims do not drop out when the im-
peller comes off the crankshaft.