VALVE
SEAT SEALING CONDITION INSPECTION
With the
va
l
ve
and valve spring assembled, pour a small quan-
tity of gasoline into the intake or exhaust port.
Check that no gasoline leaks through the valve seat. If leakage
is found, correct the sealing surface.
A
WARNING
Gasoline
is
highly
flammable
and
explosive
,
Keep heat,
sparkS,
ana
flames
away
from
gasoline
.
VALVE
SPRING
The force of the coil spring keeps the valve seat tight. A weak-
ened spring results
in
reduced engine power output and accounts
for the chattering noise coming from the
valve mechanism.
Check the valve springs for proper strength
by
measuring their
free
length and al
so
by the force required to compress them. If
the spring length is less than the service limit or
if
the force
reo
quired
to
compress the valve spring
is
not within specification,
replace both the inner and outer springs as a set.
_ Valve s
pr
ing free le
ngth
(
IN
& EX)
Service Li
mi
t:
INNER: 32,6
mm
(1.
28
in)
OUTER: 36.3
mm
(1
.
43
in)
_ Valve
spring
tension
(IN & EX)
Stanaara:
INNER:
56 -
64
N (5.6 - 6.4 kgf) 127.4
mm
(12.3 - 14.1 IbS/1.08 in)
OUTER: 126
-145
N
(1
2.6 - 14.5 kg!)
130
.9 mm
(
27
.7 -
32
.0
IbS/1
.
22
in)
ENGINE 3-
29
5.6 -
6.4
kg
!
(12.3 - 14.1
Ibs)
-0
r
l
g~~n
~
~~
!(!)
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