POWERHEAD - 4B-990-824052R3 JUNE 2002
Water Pump Cleaning and Inspection
1. Inspect the water tube coupling for wear or dam-
age. If necessary replace..
a
a-Water Tube Coupling
2. Inspect the water pump impeller for wear on the
end, top and bottom of the impeller blades. Re-
place the impeller if this condition is found.
3. Inspect for proper bonding between the hub and
the impeller. Replace the impeller if improper
bonding is found.
a
b
a-Hub
b-Impeller
4. Inspect the impeller blades to see if they are
cracked, burnt, hard or deformed. Replace the
impeller if the blades are in this condition.
IMPORTANT: The circular groove formed by the
impeller sealing bead should be disregarded
when inspecting cover and plate. The depth of
the groove will not affect water pump output.
5. Replace cover if plastic is melted from excessive
heat (lack of water). Replace stainless insert and/
or face plate if grooves (other than impeller seal-
ing bead groove) are more than 0.010 in. (0.254
mm) deep.
57408
a
b
c
d
a-Water Pump Face Plate
b-Sealing Groove (disregard)
c-Water Pump Cover
d-Stainless Insert [discard if grooves exceed
0.010 in. (0.254 mm)]
IMPORTANT: It is recommended that all seals and
gaskets be replaced (as a normal repair proce-
dure) to assure effective repair.
IMPORTANT: It is recommended that the water
pump impeller be replaced whenever the gear-
case is removed for maintenance. However, if it
is necessary to re-use the impeller, DO NOT
install in reverse to original rotation as premature
impeller failure will occur.
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