Section 13 PROPULSION
Subsection 01 (JET PUMP)
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1
TYPICAL
1. Inspect impeller and boot
Impeller/Wear Ring Clearance
This clearance is critical for jet pump performance.
Clearance can be checked from water inlet open-
ing or from venturi side. However, the last
method requires more work.
To check clearance from water inlet side, remove
inlet grate.
To check clearance from venturi side, remove ven-
turi/nozzle assembly.
Using a feeler gauge with 30 cm (12 in) blades,
measure clearance between impeller blade tip and
wear ring. Measure each blade at its center.
MODEL
MAXIMUM WEAR CLEARANCE
mm (in)
All 4-TEC 0.35 (.014)
If clearance is greater, disassemble jet pump and
inspect impeller and wear ring. Renew worn
parts.
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TYPICAL — MEASURING FROM WATER INLET SIDE
1. Feeler gauge
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1
TYPICAL — MEASURING FROM VENTURI SIDE
1. Feeler gauge
REMOVAL
Pump Assembly
Remove O.P.A.S. “U” lever screws.
638 smr2004-Complete Line Up
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