Cooling System; Coolant - Change; Fig. 8-18Radiator Cap; Fig. 8-19Coolant Drain Cock (Engine) - Mitsubishi S6B Operation & Maintenance Manual

Cooling system

Coolant - Change

Remove the radiator cap only after the engine has
cooled to room temperature. Place a waste cloth over
the cap, and loosen the cap about a half-turn or stand
the lever to the upright position to release internal
pressure. Never open the radiator cap while the
engine is hot, as it causes steam and hot coolant to
blow out and could result in serious burns.
Coolant (containing LLC) drained from the engine is
toxic. Never dispose of coolant into regular sewage.
For disposal of used coolant, consult your Mitsubishi
dealer or a industrial waste disposer.
The service life of LLC is 2 years. Be sure to change
coolant at least once every 2 years.
Coolant - Drain
1. When draining coolant immediately after engine
operation, let the engine idle at low idling speed for
5 to 6 minutes to lower the coolant temperature to
70 to 80 °C [158 to 176 °F].
2. Open the radiator cap.
3. Place coolant receiving cans under the drain cocks
and plugs, and open the coolant drain cocks and
plugs to drain the coolant.
Cooling system - Clean
Clean the cooling system when operating engine or
heat exchanger first time, or restarting the engine
after storage with coolant drained.
1. Close coolant drain cocks and plugs.
2. Pour in a cleaning solution (a solution that is non-
corrosive to rubber and metals) in the cooling sys-
tem, and operate the engine at 800 to 900 min
about 15 minutes, then drain the cleaning solution.
3. Close coolant drain cocks and plugs.
4. Pour in fresh water, and operate the engine at 800
-1
to 900 min for about 10 minutes.
Repeat rinsing until the draining water becomes
clear and clean.
Chapter 8 PERIODIC INSPECTION AND MAINTENANCE PROCEDURES
Fig. 8-19 Coolant drain cock (engine)
-1
for
Stand the lever to
Turn the cap about
the upright position
half a turn
Fig. 8-18 Radiator cap
Coolant drain
cock
8-13