Perkins 2806A-E18TA Operation And Maintenance Manual page 81

SEBU9074-06
If new drive belts are installed, check the drive belt
tension again after 30 minutes of engine operation
at the rated rpm.
Coolant (Commercial Heavy-
Duty) - Change
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: Inspect the water pump and the water
temperature regulator after the cooling system has
been drained.
Illustration 45
Typical example of a cooling system drain valve. The
valve is towards the bottom of the radiator.
Drain
Pressurized System: Hot coolant can cause seri-
i10086131
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 in
order to relieve any pressure. Remove the cooling
system filler cap.
2. Open the cooling system drain valve.
Allow the coolant to drain.
Flush
1. Flush the cooling system with clean water and a
suitable cleaning agent in order to remove any
debris. Refer to your Perkins distributor for
suitable cleaning agents.
2. Close the cooling system drain valve.
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.
4. Start and run the engine until normal operating
temperature.
5. Stop the engine and allow the engine to cool.
Loosen the cooling system filler cap slowly in
order to relieve any pressure. Remove the cooling
system filler cap. Open the cooling system drain
valve. Allow the water to drain. Flush the cooling
system with clean water.
6. Close the cooling system drain valve.
Fill
Fill the cooling system no faster than 19 L (5 US gal)
per minute to avoid air locks.
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Maintenance Section
Coolant (Commercial Heavy-Duty) - Change
NOTICE
NOTICE
81