Coolant (Commercial Heavy-Duty) - Change - Perkins 904F-E28T Operation And Maintenance Manual

78
Maintenance Section

Coolant (Commercial Heavy-Duty) - Change

4. Start and run the engine at low idle for a minimum
of 30 minutes. The coolant temperature should be
at least 82 °C (180 °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.
5. 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. Remove the connection hose or remove
the cooling system drain plugs. Allow the water to
drain. Flush the cooling system with clean water.
Install the connection hose.
6. Install the drain plugs and tighten securely.
Fill
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.
1. Fill the cooling system with the coolant/antifreeze.
Refer to this Operation and Maintenance Manual,
"Refill Capacities and Recommendations" topic
(Maintenance Section) for more information on
cooling system specifications. Do not install the
cooling system filler cap.
2. Start and run the engine at low idle. Increase the
engine rpm to high idle. Operate the engine to
open the engine thermostat. This operation will
allow any air in the system to be purged. Decrease
the engine speed to low idle. Stop the engine.
3. Maintain the coolant level at the maximum mark
that is correct for your application.
4. Clean the cooling system filler cap. Inspect the
gasket that is on the cooling system filler cap. If
the gasket that is on the cooling system filler cap is
damaged, discard the old cooling system filler cap
and install a new cooling system filler cap. If the
gasket that is on the cooling system filler cap is not
damaged, perform a pressure test. If the cooling
system filler cap does not retain the correct
pressure, install a new cooling system filler cap.
5. Start the engine. Inspect the cooling system for
leaks and for the correct operating temperature.
Coolant (Commercial Heavy-
Duty) - Change
Note: This procedure is for coolants that meets a
commercial heavy-duty coolant specification of
"ASTM D4985" .
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.
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.
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