Subaru Robin PKX201 - Manual (Page 25)

PKV101 Service
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34. Screw and snug the impeller hand tight on the crank
shaft, making sure it is fl ush with the back plate.
Note: If shims are not properly installed onto crankshaft,
the impeller will not fi t fl ush to backing plate. If this
condition occures, remove impeller and push the
shims onto crankshaft further, making sure the
sims are not bent out of shape.
33. Re-install the shim(s) making sure you replaced the
same number that came installed with the pump. If a
new component such as a impeller or volute was
installed, refer to the section on proper shimming.
35. To inure the impeller is installed correctly, place the vo-
lute against the back plate. While holding the volute
tight against the back plate with one hand, check
the clearance between the volute and impeller with a
feeler gauge. If the clearance is larger than 0.040
thousands of an inch, then another shim must be
added.
The recommended clearance is 0.020 to 0.040 thou
sands of an inch.
36. If shims need to be added or subtracted then re
move the volute and impeller, taking note of how many
shims were added or subtracted. Re-install impeller
and check again. After proper clearance is
obtained install impeller once again.