D439E Service Manual 2. Engine Mechanical System (D439E)
124
Inspection
Water Pump
1. Inspect the crack, damage, and wear of the parts,
and replace the water pump if necessary.
2. Inspect the bearing to see any damage, unusual
noise, and poor revolution and replace it, if
necessary.
3. Check the leakage of the seal unit and replace
the water pump, if necessary.
Thermostat
1. Heat the water to see if the thermostat valve
operates properly.
2. Measure the temperature when the valve starts
opening and is fully open.
Item Specification
Valve opening
temperature
80~84°C
Valve lift / temperature more than 10 / 95°C
V-Belt Tension Check
Adjust the belt tension to obtain the specified belt
deflection when the center of each belt is pressed
hard with a force of 10 kgf.
Deflection between the alternator ( 1) and water
Pump (2) : 12~16mm
CAUTION
a. Since a slack belt may cause overheating or
undercharge, adjust the tension to the
specification.
b. An excessively tight belt may result in
possible damages of the belt or bearing.
c. All of two V-belts should be replaced as a
complete set.
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