Honda WB20XT2 Manual page 38

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IMPELLER CLEARANCE CHECK
MAINTENANCE
Remove the volute case [1]
Measure the depth of the impeller cover by using the
depth gauge or vernier caliper.
Measure the height of the impeller vanes [1] from the
casing cover [2].
3-2
(page 10-3).
[1]
[2]
[1]