Perkins 415GM - Coolant System Maintenance

N39453 Chapter 4
Page 47
How to drain the coolant circuit
Warnings!
• Do not drain the coolant while the engine is still hot and the system is under pressure because dangerous
hot coolant can be discharged.
• Discard used coolant in a safe place and in accordance with local regulations.
1. Remove the ller cap of the coolant circuit.
2. Remove the drain plug (A1) from the cylinder block which is situated in the same place on all the engines
and the drain plug from the heat exchanger, (B1) on the 415GM and (C1) on the 422GM/422TGM. Ensure
that the drain holes are not restricted. Also, on the 422TGM, remove the drainplug on the raw water cooler
(D1).
3. After the system has been drained, t the ller cap and the drain plugs.
4. Fasten a label in a suitable place to indicate that the coolant system has been drained.
Caution: The closed circuit system cannot be drained completely. If the coolant is drained for engine
preservation purposes or for protection from frost, the coolant system must be lled again with an approved
coolant mixture prior to the storage period. See “Coolant specication” for details of the correct coolant to be
used in the circuit.
Engines tted with keel coolers
The coolant capacity and the method used to drain the coolant circuit of an engine connected to a keel cooler
will vary in different applications.
Use the instructions given by the keel cooler manufacturer to drain and renew the engine coolant when a keel
cooler is tted.