TP-6323 3/0630 Section 3 Scheduled Maintenance
3.7.4 Pressure Cap
Closed heat exchanger systems utilize a pressure cap
to raise the boiling point of the coolant, enabling higher
operating temperatures. If the cap leaks, replace it with
a cap of the same rating. Find the pressure cap rating in
Figure 3-6.
3.7.5 Seawater Pump
The belt-driven seawater pump is located on the engine
end of the generator set. 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 and Replacement Procedure:
1. Close the seacock.
2. Remove the seawater pump coverplate. See
Figure 3-7.
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 3-8.
Replace the impeller if it is damaged.
1
2
3
4
5
6
78
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
TP-6053
11
Figure 3-7 Seawater Pump, Typical
1
2
3
1. Flattened vane
2. Crack
3. Broken vane
TP-6053
Figure 3-8 Worn Impeller
5. Lubricate the impeller with soapy water before
installation.
6. Install the impeller.
Note: During installation push and rotate the
impeller in the same direction as the engine
rotation until it is thoroughly seated in the
impeller housing.
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
damaged or worn components.
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