Subaru Robin PKX201 - Manual (Page 83)

High Pressure Pumps - PKX Service
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33. Re-install the shim(s) using the same number as was
taken off. If new components such as impeller or
volute was used, it may become necessary to re-shim
with new shims for proper clearance. Check the
procedure listed in a later step on how to perform this
function.
34. Re-install the spring.
35. Hand tighten the impeller onto the crankshaft. Make
sure it is threaded on all they way. If impeller is not
threaded to the full extend, the impeller face could
strike against the inside of the volute.
36. To make sure the impeller is shimmedcorrectly, hold
the volute against the back plate and check the
clearance with a feeler gauge. If the clearance is
larger than 0.0197in. then another shim must be
added.
If there is less than 0.0078 in. between the volute and
impeller, and the unit does not easily turn over with the
rope start, then it is possible that a shim needs to be
removed.