Section 13 PROPULSION SYSTEM
Subsection 02 (JET PUMP)
SMR2003-040_13_02A.FM 13-02-25
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. For
GTX 4-TEC clearance should not exceed 0.35 mm
(.014 in). If clearance is greater, disassemble jet
pump and inspect impeller and wear ring. Renew
worn parts.
TYPICAL — MEASURING FROM WATER INLET SIDE
1. Feeler gauge
TYPICAL — MEASURING FROM VENTURI SIDE
1. Feeler gauge
REMOVAL
Pump Assembly
Remove OPAS “U” lever screw, washer and
bushings from nozzle.
TYPICAL
1. “U” lever screw
Disconnect steering and reverse cables.
Disconnect OPAS hose from top of pump.
Remove 4 pump retaining nuts.
F01J0EA
1
F01J0FA
1
1
F18J0DA
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