10 Scheduled Maintenance TP-5977 7/98
Use only a permanent-type coolant that meets
specifications. Use a coolant solution of 50% ethylene
glycoland50%clean,softenedwatertoinhibitcorrosion
and prevent freezing to --34_F (--37_C). Do not use
alcohol or methanol antifreeze or mix them with the
coolant. The coolant system is equipped with an air
bleed feature. Do not remove the air bleed orifice from
the system or engine overcooling results.
3.8.1 Wet Manifold
Some generator sets may be equipped with a wet
manifoldinwhichthecoolantsolutioncirculatesthrough
the exhaust manifold to reduce the exhaust
temperature. Figure 3-7 illustrates the direction of
coolant flow on a generator set equipped with a wet
manifold. Coolantflowinanenginewithadryexhaustis
based upon the same principal; however, coolant flows
only through the engine and then back to the radiator.
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2
3
4
5
6
7
8
TP-5405-3
1. Radiator
2. Fan
3. Exhaust manifold
4. Arrows indicate direction of water flow
5. Water temperature sender
6. Thermostat
7. Bypass
8. Water pump
Figure 3-7. Cooling Water Circulation
(Wet Manifold)
3.8.2 Draining and Refilling the Cooling
System
Perform the following procedure to drain and refill the
cooling system.
1. Placethegeneratorsetmaster switchin theSTOP
position.
2. Disconnect the generator set engine starting
battery, negative (--) lead first.
3. With the engine cool remove the radiator cap.
4. Place a container under the generator set radiator
petcock and engine block drain plug.
5. Openthepetcockonthebottomoftheradiatorand
remove the drain plug from the engine block.
6. Whenallthecoolant has beendrainedreinstallthe
drainplugintheengineblockandclosethepetcock
on the bottom of the radiator.
7. Fill the radiator to the correct level with the
recommended coolant mixture.
8. Reinstall the radiator cap.
9. Reconnect the generator set engine starting
battery, negative (--) lead last.
10. Start the generator set and operate until the
thermostat opens and the upper radiator hose
becomes warm.
11. Stop the generator set and allow to cool.
12. Remove radiator cap and add coolant to the
radiator until the level is just below the overflow
tube on the filler neck.
13. Reinstall the radiator cap.
Maintain coolant recovery tank coolant level between
1/3 full (cold) and 2/3 full (hot) if the engine is equipped
with a coolant recovery tank.
NOTE
Periodically check the coolant level on closed systems
by removing the radiator’s pressure cap. Do not rely
solely on the level in coolant recovery tank. Add fresh
coolant until level is just below the overflow tube
opening.
NOTE
Pay special attention to the coolant level. After draining the
coolant, when filling cooling system, allow time for complete
refill of the engine water jacket. Check coolant level as
prescribed in the Prestart Checklist of the Operation Manual.
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