TP-5936 7/0416 Section 5 Cooling System
5.7 Impeller Inspection and
Replacement
The belt-driven seawater pump is located on the service
side of the generator set. Check and change the
seawater pump impeller at the interval specified in the
service schedule. Follow instructions in the impeller kit.
If the instructions are not included with the kit use the
following procedure.
Impeller Inspection and Replacement Procedure:
1. Close the seacock.
2. Remove the seawater pump coverplate. See
Figure 5-5.
3. Remove the impeller.
4. Inspect the impeller for damage, including visible
cracks, missing pieces, or flat spots. Impeller
vanes should be straight and flexible. See
Figure 5-6.
5. Lubricate the impeller with soapy water before
installation.
6. While installing the impeller, always rotate the drive
shaft and the impeller together in the same
direction as the engine rotates.
7. Inspect the coverplate and gasket for corrosion
and/or damage. Replace components as
necessary.
8. Lubricate the gasket with silicon grease and attach
the gasket and coverplate to the seawater pump
housing.
9. Open the seacock.
10. Start the generator set and check for leaks.
11. Stop the generator set and repair leaks or replace
components as necessary.
1
2
3
4
5
6
7
8
9
10
1. Seawater pump
2. Coverplate
3. Gasket
4. Impeller
5. Bearing
6. Housing
7. Pulley
8. Drive shaft
9. Washer
10. Nut
TP-5936-28
Figure 5-5 Seawater Pump, Typical
1
2
3
1. Flat spot
2. Crack
3. Broken vane
TP-5936-57
Figure 5-6 Worn Impeller
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