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Yamaha F4B Service Manual

Yamaha F4B
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7-36
Cylinder head
0
1
2
3
4
5
6
7
8
9
10
A
3. Measure the thermostat valve opening a
at the specified water temperatures.
Replace if out of specification.
Assembling the cylinder head
Do not reuse a gasket or oil seal, always
replace it with a new one.
1. Install a new valve seal a.
2. Install the valve b, spring seat c, valve
spring d, and valve spring retainer e in
this order, and then install the special
service tools f and g.
3. Compress the valve spring, and then
install the valve cotter h.
Water
temperature
Valve opening a
58–62 °C
(136–144 °F)
Starts opening
above 70 °C
(158 °F)
3.0 mm (0.12 in) or above
a
a
Valve spring compressor f:
90890-04019
Valve spring compressor attachment g:
90890-06320
g
f
e
d
c
b
h
h

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Yamaha F4B Specifications

General IconGeneral
BrandYamaha
ModelF4B
CategoryOutboard Motor
LanguageEnglish

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