Shibaura ST330, Workshop Manual

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16) Water pump assembly and thermostat
Disassembly
(1) Remove the set plate gasket.
(2) Remove the thermostat spring.
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.
142Y
1. Water pump ass’y
2. Gasket
3.
Set plate
Model N843
Type Wax pellet
Opening temperature 71° C
Full-opening temperature 82°C
Valve lift
8.0 mm
143Y