NOTICE
When any servicing or repair of the engine cooling
system is performed, the procedure must be per-
formed with the engine on level ground. Level ground
will allow you to check accurately the coolant level.
This procedure will also help in avoiding the risk of in-
troducing an air lock into the coolant system.
Note:
When the cooling system is cleaned, only
clean water is needed.
Note:
Inspect the water pump and the water
temperature 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.
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.
Note:
Refer to Operation and Maintenance Manual,
“General Hazard Information” for information on
Containing Fluid Spillage.
Illustration 30
g06427688
Typical example
2.
Open the drain cock or remove the drain plug (1)
on the engine. Open the drain cock or remove the
drain plug on the radiator.
Allow the coolant to drain into a suitable container.
NOTICE
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-
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 dealer
or your Perkins distributor.
Flush
NOTICE
Cleaning agents for an industrial cooling system must
not be used. These cleaning agents are very aggres-
sive and cause damage to the cooling system
components.
1.
Flush the cooling system with clean water and a
suitable cleaning agent to remove any debris.
Refer to your Perkins dealer or distributor for
suitable cleaning agents.
2.
Close the drain cock or install the drain plug in the
engine. 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 to avoid air locks.
Cooling system air locks may result in engine
damage.
3.
Fill the cooling system with clean water. Install the
cooling system filler cap.
4.
Start and run the engine until the temperature
reaches 49 to 66 °C (120 to 150 °F).
NOTICE
Improper or incomplete rinsing of the cooling system
can result in damage to copper and other metal
components.
To avoid damage to the cooling system, make sure to
completely flush the cooling system with clear water.
Continue to flush the system until all signs of the
cleaning agent are gone.
54
M0105633-01
Maintenance Section
Cooling System Coolant (Commercial Heavy-Duty) - Change
