ENGINE SYSTEMS
69
17) Radiator
Specifications and structure
Structure
(1) The radiator is provided with the plate fin having
superior anti-vibration characteristics.
(2) The radiator cap is of the pressure type (sealing type)
for higher cooling efficiency.
When the cooling water is heated to high
temperature (high pressure), the pressure valve is
pushed and opened to release excessive pressure
from the overflow pipe (shown by white arrow
mark).
When the cooling water temperature reduces and the
inside pressure becomes lower than the atmospheric
pressure, the negative pressure valve is opened to
protect the radiator from being crushed under the
atmospheric pressure (shown by black arrow mark).
Inspection
(1) Check the radiator pipe for water leakage and repair
or replace if unsatisfactory.
(2) Check the radiator fin and remove dust, mud, or
other foreign matter clogging in the air passage, if
any.
(3) Check the pressure valve and negative pressure
valve of the radiator cap for valve opening pressure
and sealing condition. Replace of defective.
(4) Check the radiator hose and replace if damaged or
aged.
(5) If the net is clogged, remove and clean.
Specifications
Fin type Corrugated
Cooling water volume
3.5 ℓ
Pressure valve starting
pressure
68.6 – 88.2 kPa
(0.7 – 0.9 kgf/cm
2
)
Negative pressure valve
starting pressure
– 4.9 kPa
(0.04 – 0.05 kgf/cm
2
)
Heat radiation volume
15,000 kcal/h
46
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