Thermostat Inspection - TOHATSU BFT75A Service Manual

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COOLING SYSTEM
FLUSH VALVE DISASSEMBLY/ASSEMBLY
Remove the engine under cover (page 6-5).
TUBE (7 X 110 mm)
INSTALLATION:
Check the tube (7 X 110
mm) for deterioration and
cracks.
Replace if necessary.
(Apply grease to the part
where the water mouth
nut contacts with the
water mouth seat.)
TUBE (8 X 300 mm)
INSTALLATION:
Check the tube (8 X 300
mm) for deterioration and
cracks.
Replace if necessary.
TUBE CLIP (13 mm)

THERMOSTAT INSPECTION

Remove the thermostat [1] (page 11-4).
Immerse the thermostat in water.
Heat the water and observe the operation of the
thermostat as the water temperature increases.
Measure the water temperature when the thermostat
starts opening.
Cylinder head side:
START OPENING:
FULLY OPEN:
Cylinder block side:
START OPENING:
FULLY OPEN:
Measure the lift height when the thermostat is fully
open.
LIFT HEIGHT: More than 3.0 mm (0.12 in)
11-12
TUBE CLAMP (D 10.5) (2)
O-RING
WATER HOSE
JOINT A
WATER MOUTH
SEAT
WATER MOUTH
NUT
48 – 52 °C (118 – 126 °F)
60 °C (140 °F)
58 – 62 °C (136 – 144 °F)
70 °C (158 °F)
FLUSH VALVE
SPRING
FLUSH VALVE
INSPECTION:
Check the flush valve
gasket for deterioration and
cracks.
Replace if necessary.
INSTALLATION:
Note the installation
direction.
FLUSH
FLUSH VALVE
VALVE
COVER
GASKET
BOLT (6 x 20 mm)
[2]
FLUSH VALVE
COVER SIDE
[1]