Section 12
PROPULSION SYSTEM
Subsection 02
(JET PUMP)
SMR2002-088_12_02A.FM
12-02-3
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 as described in
Oil In-
spection
in this subsection.
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. Clear-
ance should not exceed 1.0 mm (.040 in). If clear-
ance 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
Oil Inspection
Remove:
– reverse gate cable
– steering cable
– screws
no. 10
retaining venturi to the housing.
Pull venturi.
Remove plug from cover.
TYPICAL
1. Remove plug
Check oil level, it should be at bottom of hole threads.
If oil level is low, check impeller shaft housing for
leaks. A pressure test must be performed. See
PUMP PRESSURIZATION in this subsection.
To check oil condition, insert a wire through oil lev-
el hole then withdraw. A whitish oil indicates wa-
ter contamination.
F01J0EA
1
F01J0FA
1
F01J5IA
1
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Summary of Contents for GTX 4-TEC 5573 2002
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