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68
Maintenance Section
Cooling System Coolant (ELC) - Change
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
pressure.
Illustration 46
Typical example
1. Stop the engine and allow the engine to cool.
Isolate the electrical supply to the engine. Loosen
the cooling system filler cap (1) slowly to relieve
any pressure. Remove the cooling system filler
cap.
Illustration 47
Typical example
2. Open the drain cock or remove the drain plug (2) in
the cylinder block.
3. Open the drain cock or remove the drain plug on
the radiator.
Illustration 48
Typical example
4. Open the drain cock or remove the drain plug (3) in
the oil cooler.
5. Allow the coolant to drain.
Dispose of used engine coolant or recycle. Various
methods have been proposed to reclaim used cool-
ant for reuse in engine cooling systems. The full distil-
g01211179
lation procedure is the only method acceptable by
Perkins to reclaim the coolant.
For information regarding the disposal and the
recycling of used coolant, consult your Perkins
distributor.
Flush
1. Flush the cooling system with clean water to
remove any debris.
2. Close the drain cock or install the drain plug (2) in
the cylinder block. Close the drain cock or install
the drain plug on the radiator. Close the drain
cocks or install the drain plug (3) in the oil cooler.
Tighten the plugs securely.
Do not fill the cooling system faster than 5 L
(1.3 US gal) per minute to avoid air locks.
Cooling system air locks may result in engine
damage.
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3. Fill the cooling system with clean water.
Install the cooling system filler cap (1).
4. Install power to the engine. Start the engine.
Operate the engine until the temperature reaches
49 °C to 66 °C (120 °F to 150 °F).
SEBU9077-02
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NOTICE
NOTICE
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