Perkins 4008-30 Operation And Maintenance Manual page 70

70
Maintenance Section
Cooling System Coolant - Change
Note: When the cooling system is cleaned, only
clean water is needed when the coolant is drained
and replaced.
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.
Illustration 50
Typical example
1. Stop the engine and allow the engine to cool.
Isolate the electrical supply to the engine. Loosen
the cooling system filler cap (1) slowly to relieve
any pressure. Remove the cooling system filler
cap.
Illustration 51
Typical example
2. Open the drain cock or remove the drain plug (2) in
the cylinder block.
3. Open the drain cock or remove the drain plug on
the radiator.
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Illustration 52
Typical example
4. Open the drain cock or remove the drain plug (3) in
the oil cooler.
5. Allow the coolant to drain.
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.
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NOTICE