Honda WX15T Manual page 30

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Measure the height of the impeller vanes [1] from the
casing cover [2].
Subtract the height of the impeller [1] from the depth of
the volute case [2] to obtain the impeller clearance [3].
IMPELLER CLEARANCE:
0.70 - 1.00 mm (0.028 - 0.39 in)
If the clearance is not within specification, adjust the
clearance by adding or removing adjuster shims [4]
(page 9-5).
SHIM THICKNESS: 0.3 mm (0.012 in)
MAINTENANCE
[1]
[2]
[2]
[1]
[3]
[4]
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