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3.9.4 Pressure Cap
Closed heat exchanger systems utilize a pressure cap to raise the boiling point of the engine coolant, enabling proper operating
temperatures. If the cap leaks, replace it with a cap of the same rating. The pressure cap typically has the pressure rating
stamped on the cap body.
3.9.5 Seawater Pump
The belt-driven/gear-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 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. Press the generator set OFF/RESET button to shut down the generator set.
2. Disconnect the power to the battery charger, if equipped.
3. Disconnect the generator set engine starting battery, negative (-) lead first.
4. Close the seacock.
5. Remove the seawater pump cover plate. See Figure 40.
6. Remove the impeller.
7. Inspect the impeller for damaged, cracked, broken, missing or flattened vanes. The impeller vanes should be straight
and flexible. See Figure 41. Replace the impeller if it is damaged.
8. Lubricate the impeller with soapy water before installation.
9. 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.
Figure 40 Seawater Pump, Typical
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