Perkins 400 Series Operation And Maintenance Manual page 61

SEBU7992-05
NOTICE
Keep all parts clean from contaminants.
Contaminants may cause rapid wear and shortened
component life.
Clean the cooling system and flush the cooling
system before the recommended maintenance
interval if the following conditions exist:
• The engine overheats frequently.
• Foaming is observed.
• The oil has entered the cooling system and the
coolant is contaminated.
• The fuel has entered the cooling system and the
coolant is contaminated.
Note: When the cooling system is cleaned, only
clean water is needed when the ELC is drained and
replaced.
Note: Inspect the water pump and the water
temperature regulator after the cooling system has
been drained. During this maintenance procedure,
consider replacing 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
pressure.
1. Stop the engine and allow the engine to cool.
Loosen the cooling system filler cap slowly to
relieve any pressure. Remove the cooling system
filler cap.
Cooling System Coolant (ELC) - Change
Illustration 35
Drain plug option
Illustration 36
Drain tap option
2. Remove drain plug (1) or open drain tap (2) for the
engine.
3. Remove the drain plug or open the drain tap on the
radiator.
4. Allow the coolant to drain.
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Maintenance Section
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