65
Maintenance Section
Cooling System Coolant (DEAC) - Change
NOTICE
Use of commercially available cooling system clean-
ers may cause damage to cooling system compo-
nents. Use only cooling system cleaners that are ap-
proved for Caterpillar engines.
Note: Inspect the water pump and the water
temperature regulator after the cooling system has
been drained. This is a good opportunity to replace
the water pump, the water temperature regulator
and the hoses, if necessary.
Drain
Pressurized System: Hot coolant can cause seri-
ous burns. To open the cooling system filler cap,
stop the engine and wait until the cooling system
components are cool. Loosen the cooling system
pressure cap slowly in order to relieve the pres-
sure.
1. Stop the engine and allow the engine to cool.
Loosen the cooling system filler cap slowly
in order to relieve any pressure. Remove the
cooling system filler cap.
2. Open the cooling system drain valve (if
equipped). If the cooling system is not equipped
with a drain valve, remove one of the drain plugs.
Allow the coolant to drain.
NOTICE
Dispose of used engine coolant properly or recycle.
Various methods have been proposed to reclaim used
coolant for reuse in engine cooling systems. The full
distillation procedure is the only method acceptable by
Caterpillar to reclaim the used coolant.
For information regarding the disposal and the
recycling of used coolant, consult your Caterpillar
dealer or consult Caterpillar Service Technology
Group:
Outside Illinois: 1-800-542-TOOL
Inside Illinois: 1-800-541-TOOL
Canada: 1-800-523-TOOL
Flush
1. Flush the cooling system with clean water in
order to remove any debris.
2. Close the drain valve (if equipped). Clean the
drain plugs. Install the drain plugs. Refer to
the Specifications Manual for your particular
engine for more specific information on the
proper torques. Refer to the Specifications,
SENR3130, “Torque Specifications” for more
general information on the proper torques.
NOTICE
Fill the cooling system no faster than 19 L (5 US gal)
per minute to avoid air locks.
3. Fill the cooling system with a mixture of clean
water and Caterpillar Fast Acting Cooling System
Cleaner. Add .5 L (1 pint) of cleaner per 15 L
(4 US gal) of the cooling system capacity. Install
the cooling system filler cap.
4. Start the engine and run the engine at low
idle for a minimum of 30 minutes. The coolant
temperature should be at least 82
C (180
F).
NOTICE
Improper or incomplete rinsing of the cooling system
can result in damage to copper and other metal com-
ponents.
To avoid damage to the cooling system, make sure
to completely flush the cooling system with clear wa-
ter. Continue to flush the system until all signs of the
cleaning agent are gone.
5. Stop the engine and allow the engine to cool.
Loosen the cooling system filler cap slowly
in order to relieve any pressure. Remove the
cooling system filler cap. Open the drain valve (if
equipped) or remove the cooling system drain
plugs. Allow the water to drain. Flush the cooling
system with clean water. Close the drain valve (if
equipped). Clean the drain plugs. Install the drain
plugs. Refer to the Specifications Manual for your
particular engine for more specific information on
the proper torques. Refer to the Specifications,
SENR3130, “Torque Specifications” for more
general information on the proper torques.
Cooling Systems with Heavy
Deposits or Plugging
Note: For the following procedure to be effective,
there must be some active flow through the cooling
system components.
1. Flush the cooling system with clean water in
order to remove any debris.
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