How To Drain The Coolant Circuit; Engines Fitted With Keel Coolers - Perkins M92B User Handbook Manual

Chapter 4

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 filler cap of the coolant circuit.
2. Remove the drain plug (C1) from the side of the cylinder block and the drain plug (D1) from the heat
exchanger. Ensure that the drain holes are not restricted.
3. After the system has been drained, fit the filler 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 filled again with an approved
antifreeze mixture. See "Coolant specification" in section 5 for details of the correct coolant to be used in the
circuit.

Engines fitted 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 fitted.
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