TP-6137 5/0332 Section 6 Cooling System
6.2 Thermostat
In a direct seawater cooling system, the impeller pump
circulates the seawater around the cylinder and through
the cylinder head. A thermostat controls the cooling water
circuit temperature. See Figure 6-2 for thermostat
settings. Consult the engine operation manual for the
thermostat cleaning and checking procedures.
Thermostat Settings
(Max. Temp.)
Seawater
50_C (122_F)
Freshwater
75_C (167_F)
Figure 6-2 Thermostat Settings
6.3 Seawater Pump and Impeller
The gear driven seawater pump is located on the
alternator 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. Close the seacock.
2. Remove the seawater pump coverplate. See
Figure 6-3.
1
2
3
4
5
6
1. Seawater pump
2. Coverplate
3. Gasket
4. Impeller
5. Bearing
6. Housing
TP-6053
Figure 6-3 Seawater Pump, Typical
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 6-4.
Replace the impeller if it is damaged.
1
2
3
1. Flattened vane
2. Crack
3. Broken vane
TP-6053
Figure 6-4 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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