Section 12
PROPULSION SYSTEM
Subsection 02
(JET PUMP)
12-02-24
SMR2002-088_12_02A.FM
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
venturi/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 bush-
ings from nozzle.
1. “U” lever screw
Disconnect steering and reverse cables.
Disconnect OPAS hose from top of pump.
Remove 4 pump retaining nuts.
Pull out pump.
F01J0EA
1
F01J0FA
1
1
F18J0DA
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Содержание GTX 4-TEC 5573 2002
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