Honda CRF450X 2005 Service Manual page 157

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Remove the impeller, washer and water pump shaft
from the right crankcase cover.
Check the water pump shaft for wear or damage.
Turn the inner race of the water pump shaft bearing
with your finger.
The bearing should turn smoothly and quietly.
Also check that the bearing outer race fits tightly in
the right crankcase cover.
Replace the water pump shaft bearing if the inner
race does not turn smoothly, quietly, or if the outer
race fi ts loosely in the right crankcase cover.
Check the mechanical seal for damage or deteriora-
tion.
Replace the mechanical seal if necessary (page 7-12).
COOLING SYSTEM
WATER PUMP SHAFT
RIGHT CRIINKCA'5E COVE R
WATER PUMP SHAFT
ME·CH',NI'<:AlSEAl
7-11
"