TP-5986 4/03 15Section 5 Cooling System
5.5 Impeller
This model uses a direct-driven seawater pump located
on the generator end. Check and change the seawater
pump impeller at the interval specified in the service
schedule. Follow the instructions included with the
impeller kit. If the instructions are not included with the
kit, use the following procedure.
Impeller Inspection/Replacement Procedure
1. Close the seacock.
2. Remove the seawater pump coverplate. See
Figure 5-2.
3. Remove the impeller.
4. Inspect the impeller for damaged, cracked, broken,
missing or flattened vanes. The impeller vanes
should be straight and flexible. See Figure 5-3.
Replace the impeller if it is damaged.
7
3
1
2
4
5
6
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
11. Mechanical seal,
if equipped
11
598652
Figure 5-2 Seawater Pump, Typical
1
2
3
1. Flat spot
2. Crack
3. Broken vane
598653
Figure 5-3 Worn Impeller
Note: Impeller pieces can cause blockage and
overheating. Locate and remove all missing
impeller pieces from the cooling system.
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 rotation.
7. Inspect the coverplate and gasket for corrosion
and/or damage. Replace components as
necessary.
8. Lubricate the gasket with petroleum jelly and install
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.
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