Flush And Clean Cooling System; Pressure Cap; Impeller Inspection And Replacement - Kohler 6EKOD Service Manual

5.5 Flush and Clean Cooling
System
For optimum protection, drain, flush, and refill the
cooling system at the interval listed in the service
schedule.
Pay special attention to the coolant level. When refilling
the cooling system, allow time for complete refill of the
engine water jacket.
described in Section 5.4.
Flush and Clean Procedure:
1. Remove the water drain pipe plug located at the
heat exchanger and completely drain the system.
2. Remove the pressure cap to make draining easier.
3. Drain, clean, and flush the cooling system and the
coolant recovery tank with clean water.
4. Replace the water drain pipe plug.
5. Fill the cooling system with recommended coolant.
6. Replace the pressure cap.

5.6 Pressure Cap

Closed heat exchanger systems utilize a pressure cap
to raise the boiling point of the coolant, enabling proper
operating temperatures. If the cap leaks, replace it with a
cap of the same rating. See Section 1, Specifications.
The pressure cap typically has the pressure rating
stamped on the cap body.
1
1. Pressure cap
Figure 5-18 Pressure Cap Location
32 Section 5 Cooling System
Check the coolant level as
5.7 Impeller Inspection and
Replacement
The belt-driven seawater pump is located on the service
side of the generator set.
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.
Figure 5-19.
1
5
4
3
2
1. Seawater pump
2. Pulley
3. Ball bearing
4. Seal
5. Ceramic seat
Figure 5-19 Seawater Pump, Typical
3. Remove the impeller.
4. Inspect the impeller for damage, including cracks,
broken or flattened vanes. See Figure 5-20. The
impeller vanes should be straight and flexible.
1. Flattened vane
2. Crack
3. Broken vane
Figure 5-20 Worn Impeller
5. Lubricate the impeller with soapy water before
installation.
Check and change the
8
7
6
9
6. Impeller
7. Gasket
8. Cover plate
9. Key
1
2
3
TP-6774 2/14a
See
607153