2.
Another symptom
of
spring fatigue
is
in
-
sufficient spring pressure. This
can
be
checked with a valve-spring-compres-
sion-rate gauge. Test each spring in-
dividually.
Place
a spring
in
the gauge
and note the spring pressure when the
spring
is
compressed
to
the installed
length (valve
closed).
If
the pressure
does not
equal the specified value,
replace
the spring.
Valve Spring Specifications
--------
Outer Spring
Inner Spring
Free
length
43.8mm
40.1
mm
(1.72 in)
(1.58 in)
Installed length
34.2mm
31.2mm
(valve closed)
(1.346in)
(1.228in)
Installed pressure
16.0
kg
8.1
kg
(valve closed)
(37.3Ib)
(17.9Ib)
Allowable
tilt
2.5
0
2.5
0
from vertical
(1.9mm)
(1.7mm)
Valve
installation
RETAINERS----___.
COLLAR
1.
Lubricate the valve stem and the oil
seal
with
a
high-quality
molybdenum
disulfide motor oil or molybdenum
disulfide grease.
2. Insert the valve in the cylinder head, and
install the oil seal. Carefully
fit
the oil
seal
over the valve stem and push
it
into
position on top
ofthe
valve guide.
3.
Install the spring seat, and install both
valve springs.
3-17
NOTE:
___________
_
All valve springs must
be
installed with the
larger pitch upward
as
shown.
LARGER PITCH
o~
0>
o
o
o
O~SMALLER
PITCH
'>
4. Install the collar.
Be
sure
it is properly
seated on the
valve springs.
5. Install the valve spring compressor, and
compress the springs.
6. Install the valve retainers.
Be
sure the re-
tainers properly engage the
valve stem.
7. Carefully remove the valve spring com-
pressor.
WARNING:
Proceed
slowly.
If
a
retainer
has
not
been
properly
installed,
it
could
be
ejected
from
the
cylinder
head.
8. Gently tap the end
of
the valve stem
with a
plastic mallet. This will ensure
that the retainers
are
properly seated in
the
collar.
D.
Rocker
Arms
and
Rocker
Arm
Shafts
1.
The rocker arm usually wears at
two
locations: at the rocker shaft hole and at
the cam-lobe-contact surface. Check
these areas
for
signs
of
unusual wear.
2.
Measure the rocker arm inside diameter.
If it exceeds specification, replace the
rocker arm.
Maximum inside diameter:
12.05 mm (0.474 in)
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