Section 10 PROPULSION SYSTEM
Subsection 02 (JET PUMP)
10-02-4 SMR2000_065_10_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 as described in Oil Inspection 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
– VTS rod
– steering cable
– bolts no. 10 retaining venturi to the housing.
Pull venturi.
Remove plug from cover.
TYPICAL
1. Remove plug
F01J0FA
1
F01J5IA
1
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