wsm wg972-e4, Workshop Manual

Page: 108 / 153

ENGINE
WG972-E4, WSM
1-S17
(3) Cooling System
Fan Belt Tension
1. Measure the deflection (A) , depressing the belt halfway
between the fan drive pulley and alternator pulley at specified
force 98 N (10 kgf, 22 lbf).
2. If the measurement is not within the factory specifications,
loosen the alternator mounting screws and relocate the
alternator to adjust.
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Fan Belt Damage and Wear
1. Check the fan belt for damage.
2. If the fan belt is damaged, replace it.
3. Check if the fan belt is worn and sunk in the pulley groove.
4. If the fan belt is nearly worn out and deeply sunk in the pulley
groove, replace it.
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Thermostat Valve Opening Temperature
1. Suspend the thermostat in the water by a string with its end
inserted between the valve and seat.
2. Heating the water gradually, read the temperature when the
valve opens and leaves the string.
3. Continue heating and read the temperature when the valve
opens approx. 8 mm (0.3 in.).
4. If the measurement is not within the factory specifications,
replace the thermostat.
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Deflection (A) Factory specification
7.0 to 9.0 mm
0.28 to 0.35 in.
(A) Deflection
(A) Good (B) Bad
Thermostat's valve
opening temperature
Factory specification
69.5 to 72.5 °C
157.1 to 162.5 °F
Temperature at which
thermostat completely
opens
Factory specification
85 °C
185 °F
KiSC issued 07, 2015 A