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8.5 Procedure to Refill Cooling System
See the generator set spec sheet for coolant capacity.
Note:
Do not add coolant to a hot engine. Adding coolant to a hot engine can cause the cylinder block or cylinder head to crack. Wait
until the engine has cooled.
1.
While covering the pressure cap with a rag, remove the pressure cap.
2.
Close the radiator and/or engine block coolant drain valve(s) and tighten the cooling system hose clamps.
Note:
If possible, fill the radiator from the bottom to avoid air pockets.
3.
Fill the cooling system with the recommended Kohler coolant mixture. Refer to the engine operation manual for
specifications.
4.
Replace the pressure cap.
5.
Operate generator set until the thermostat opens when the upper cooling system hose warms.
6.
Stop the engine and allow it to cool.
7.
Check and repair any coolant leaks.
8.
Remove the pressure cap.
9.
Add coolant to bring the coolant level to just below the overflow tube opening of the filler neck.
10. Replace the pressure cap.
11. Maintain the coolant level between the high and low marks. Check the coolant level in the radiator sight glass at the radiator
fill.
Air pockets often form in the engine water jacket when the coolant system is refilled. Check the coolant level after each
generator set operation and add coolant as necessary until the coolant level stabilizes. Then check the coolant at the interval
specified in the service schedule.
12. Reenergize the block heater, if equipped.
8.6 Radiator Maintenance
Use the following list for radiator maintenance:
Periodically check for leakage from the core or tank connections.
Inspect the liquid level at regular intervals using the top tank sight glass.
Test antifreeze before cold weather periods.
If the unit is on stand-by for long periods of time, check the interior of the top tank through the fill neck for signs of scale
or rust every one to three months. If necessary, the radiator should be cleaned, flushed, and treated.
Dirt and debris can be removed from the core face with compressed air, steam, or water, if required. If water is used,
slowly increase the pressure and stand at least 0.9 m (3 feet) away from the core. Keep the water stream parallel with
the fins in order to avoid damaging them.
Note:
Ensure that fins and tubes are not damaged from rough brushing or excessive jet pressure of the steam, air, or water.
Clean fan blades once per year. Use a stiff brush or an air nozzle for loose dirt and a nonflammable solvent with brush
for solid deposits. Care must be taken not to damage the fan blades as a resulting out-of-balance condition might cause
vibration and damage to fan bearings or motor bearings.
TP-7173
10/20
35
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