Perkins 904F-E28T Operation And Maintenance Manual page 77

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• The fuel has entered the cooling system and the
coolant is contaminated.
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: 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.
Coolant (Commercial Heavy-Duty) - Change
Illustration 36
Typical example
2. Remove 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.
3. Properly dispose of the drained material. Obey
local regulations for the disposal of the material.
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. Clean the drain plugs. Install the drain plugs.
Tighten drain plug securely.
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 and install
the cooling system filler cap.
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Maintenance Section
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