Shibaura ST318, Workshop Manual

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16) Water pump assembly and thermostat
Disassembly
(1) Remove the set plate gasket.
(2) Remove the thermostat spring.
1. Water pump ass’y
2. Gasket
3. Set plate
4. Thermostat
5. Spring
6. Gasket
NOTE: The pump main body is aluminum die cast
and should be replaced as ass’y if subjected
to water leakage or other troubles.
Specification and inspection
Thermostat
(1) Replace if the valve is opened even only slightly at
normal temperature.
(2) Immerse the thermostat in water, increase the water
temperature gradually and check the valve opening
temperature and valve lift.
NOTE: 3 to 5 minutes are required until the valve
is operated.
Reassembly
Reassemble the components in the reverse order to
disassembly.
T144
Model S753, S773 S773L
Type Wax pellet
Opening temperature 80° - 84° C 73° - 77°C
Full-opening temperature 95°C 87°C
Valve lift (at water
temperature 82
° C)
8.0 mm 6.0 mm
T145