Shibaura ST318, Workshop Manual

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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
T146