Subaru Robin PKX201 - Manual (Page 65)

Semi Trash Pumps - PKX Service
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17. Slide the seal over the crankshaft.
18. After removing from the back plate, inspect the
surfaces closely. No cracks, chips or eneven wear
should show. If pump was run without water, the
surface of the seals will have a worn and burnt
appearance.
19. This is a good time to check the condition fo the
O-ring that seals the outer pump housing to the back
plate. Check for nicks, cracks, and replace with new
part if necessary.
20. If it becomes necessary to remove the back plate for
servicing the engine, use an allen wrench to remove
the 4 bolts that attach it to the engine