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PUMP AND IMPELLER 11-15
Pump and Impeller
Impeller O utside Diameter Measurement
•
Measure the impeller outside diameter.
If the impeller is worn smaller than the service limit, re-
place it.
Impell er Outside Diameter
Standard: 147.5 ∼ 147.7 mm (5.8071 ∼ 5.8149 in.)
Service Limit: 146.5 mm (5.7677 in.)
Pump Inspection
•
Examine the pump case [A].
If there are deep scratches inside the pump case, replace
it.
○
Measure the inside diameter of the pump case.
If the pump case is worn beyond the service limit, replace
it.
Pump Case Inside Diameter
Standard: 148.0 ∼ 148.1 mm (5.8268 ∼ 5.8307 in.)
Service Limit: 149.1 mm (5.8701 in.)
Impeller Clearance
•
Impeller clearance is critical to proper performance. If the
pump case and impeller are not visibly damaged, poor
performance may be caused by too much impeller clear-
ance.
•
To check impeller clearance, remove the grate and insert
a feeler gauge [A] between the tip of the impeller blade
[B] and the pump case [C].
Impeller Clearance
Standard: 0.15 ∼ 0.3 mm (0.0059 ∼ 0.0118 in.)
Service Limit: 0.6 mm (0.0236 in.)
If impeller clearance is incorrect, determine if it is due to
wear or damage (see Pump and Impeller Inspection).
Water Filter Cover Removal/Installation
•
Loosen the clamps [A] and pull off the hoses [B].
•
Remove the filter cover mounting bolts [C].
•
Take out the filter cover [D].
•
Replace the gasket with a new one.
•
Installation is the reverse order of removal.
•
Apply a non-permanent locking agent to the filter cover
mounting bolts and torque them.
Torque - Filter Cover Mounting Bolts: 9.8 N·m (1.0 kgf·m,
87 in·lb)