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 mecha·
nism.
Check the valve springs for proper strength by measuring their
free length and also
by
the force required to compress them. If
the spring length is Jess Ihan the service limit or
if
the force
required to compress the valve spring is not within specification,
replace both the inner and outer springs as a set.
_ Valve
spr
i
ng
free
length
(IN & EX)
Service
Limit
: 38.S
mm
(1
.53 in)
_ Valve
spr
i
ng
tension
(IN & EX)
Standard:
t82
- 210 N (
t8
.6 -
2t
.4
kg!
,
41
.0 -
47
.
2Ibs)
at
length
31.5
mm
(1.24 In)
REASSEMBLY
• I nstall each valve spring seat.
• Apply molybdenum oil solution to each oil seal and press-fit
them into position.
I
CAUTION
I
Do
not
reuse the
011
seals.
• Apply molybdenum oil solution to the valve as shown, and
then insert them into the val
ve
guides.
I
CAUTION
I
When
Inserting
each valve
into
the valve
guid
es,
mak
e
sure
not
to
damage
the
lip
of
the
oil seal.
• Install the valve spring with the smaller pitch ® facing the cyl-
inder head.
@
larger
pitch
©
Down
EN
GINE
3-27
•
182 - 21
0N
(18.6 - 21.4 kgf)
I
@
:
.().
Il
r·
smm
(1.24 in)
CJ
£I
©
®
1=
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