Honda BF135A Manual page 346

b. INSPECTION
• THERMOSTAT
1) Immerse the thermostat in water.
2) Heat the water and observe the operation of the thermostat
as the water temperature increases.
3) Measure the water temperature when the thermostat starts
to open.
• Don't let the thermometer or the thermostat touch the
container; this may cause a false reading.
Thermostat for cylinder head:
Start opening
Fully open
Thermostat for cylinder block:
Start opening
Fully open
4) Measure the lift height when the thermostat is fully open.
Thermostat for cylinder head:
Lift height
Thermostat for cylinder block:
Lift height
c. THERMOSTAT IDENTIFICATION
NOTICE
There are two types of thermostat; one for the cylinder head
and the other for the cylinder block. Do not confuse them on
assembly.
Thermostat for cylinder head:
The thermostat for the cylinder head can be identified with the
purple paint (or two grooves) on the thermostat.
Thermostat for cylinder block:
The thermostat for the cylinder block can be identified with no
paint (or three grooves) on the thermostat.
8-3
48 – 52˚C (118 – 126˚F)
60˚C (140 ˚F)
58 – 62˚C (136 – 144˚F)
70˚C (158˚F)
More than 3.0 mm (0.12 in)
More than 3.0 mm (0.12 in)
[1] <Thermostat for cylinder head>
[3]
PURPLE PAINT
[1] <Thermostat for cylinder block>
[2] GROOVES
(3 places)
[1]
THERMOMETER
[2]
THERMOSTAT
[2]
GROOVES
(2 places)