Chapter 6 PERIODIC INSPECTION AND MAINTENANCE PROCEDURES
6-15
Pouring coolant
1 Make sure the drain cocks on the engine and
water pump are closed firmly.
2 Remove the cap from the water supply inlet of the
coolant tank, and pour undiluted LLC.
Note:(a) Determine the amounts of LLC and water to
be poured by using the LLC concentration
chart.
(b) Regarding coolant, refer to "Coolant" (4-6).
3 Pour soft water with minimal impurities slowly to
the full level.
4 When coolant reaches the full level securely, close
the water supply inlet cap of the coolant tank.
5 To release air from the water pump and coolant
pipes, pull the manual stop lever fully to the STOP
position and hold it in that position to keep the fuel
injection pump in no-injection condition, then sup-
ply starting air and crank the engine for about 10
seconds.
6 Wait for about 1 minute, then repeat the above
cranking operation twice to remove air from the
water pump.
7 Check the level gage on the coolant tank to make
sure there is sufficient coolant (surface level at
about the center of the level gage). If the coolant
level is low, add coolant.
8 Start the engine, and operate it under light load
until the thermostat opens the valve to allow soft
water and LLC to mix thoroughly.
9 Stop the engine, check the level gage on the cool-
ant tank. If the coolant level is low, add coolant to
the center of the fluid level gage.
Note: Always add coolant having the same LLC con-
centration.
10 Check the pipe joint and other parts for coolant
leaks.
fig.6-25 Coolant drain cock on the engine
fig.6-26 Coolant drain cock on the water pump
Coolant drain cocks
fig.6-27 Water tank coolant level
Water supply inlet
Fluid level gage
Coolant capacity (engine only)
S12U: approx. 520 L [137.37 U. S. gal]
S16U: approx. 700 L [184.92 U. S. gal]
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