Chapter 6 PERIODIC INSPECTION AND MAINTENANCE PROCEDURES
6-14
Changing Coolant
Coolant (containing LLC) drained from an engine is toxic, and must not be disposed of into regular sewage.
For disposal of used coolant, consult a Mitsubishi dealer.
When a coolant mixed with the LLC recommended by our company is used, replace coolamt every 12000
hours or 2 years, whichever comes first, in a regular-use or general-purpose engine. In an emergency engine,
replace coolant every 2 years.
Draining Coolant
1 Allow the coolant temperature to lower to 30 to
40
°C [86 to 104 °F].
2 Prepare a container to receive drained coolant.
3 Open the drain cocks on the engine, low-temper-
ature water pump, high-temperature water
pump, coolant pipe and expansion tank to drain
coolant.
Cleaning the Cooling System
1 Close the drain cocks or plug.
2 Pour a cleaning solution (non-corrosive solution to rubber and metals) in the cooling system, and operate
the engine with low idling for about 10 minutes, stop the engine, then drain the cleaning solution.
3 Close the drain cocks or plugs.
4 Pour fresh water, and operate the engine with low idling for about 10 minutes.
Continue flushing the cooling system in the above manner until the draining water is clear.
fig.6-23 Coolant drain cock (on engine)
fig.6-24 Coolant drain cock (on water pump)
Coolant drain cocks
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