86 SEBU8605-01
Maintenance Section
Cooling System Coolant (ELC) - Change
•
The engine over
heats frequently.
•
Foaming of the coolant 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
temperatu
re regulator after the cooling system has
been drained. This inspection is a good opportunity
to replace the water pump, the water temperature
regulator
, and the hoses, if necessary.
NOTICE
When any servicing or repair of the engine cool-
ing syste
m is performed, the procedure must be
performed with the engine on level ground. This pro-
cedure will allow you to accurately check the coolant
level. T
hisprocedurewillalsohelpinavoidingtherisk
of introducing an air lock into the coolant system.
Drain
Press
urized System: Hot coolant can cause seri-
ous burns. To open the c ooling system filler cap,
stop the engine and wait until the cooling system
compo
nents are cool. Loosen the cooling system
pressure c ap 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
orde
r to relieve any pressure. Remove the cooling
system filler cap.
g02119093
Illustration 50
Typical example
2. Open the drain cock or remove the drain plug (1)
on the engine. Also remove the drain plug (2).
Open the drain cock or remove the drain plug on
the radiator.
Note: Some applications have two drain plugs on the
cooler, only one is required for draining.
Allow the coolant to drain.
NOTICE
Dispose of used engine coolant 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 Perkins to
reclaim the coolant.
For information regarding the disposal and the
recycling of used coolant, consult your Perkins dealer
or your Perkins distributor.
Flush
1. Flush the cooling system with clean water in order
to remove any debris.
2. Close the drain cock or install the drain plugs.
Close the drain cock or install the drain plug on
the radiator.
NOTICE
Do not fill the cooling system faster than 5 L
(1.3 US gal) per minute, in order to avoid air locks.
Cooling system air locks may result in engine damage.
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