CYLINDER
HEAD
SERVICE
3. Check the valve seat sinkage by measuring the installed
length
of
each valve assembly. When measuring the size
up to the top
of
the valve spring retainer, include retainer
thickness (at the conar)
of
1.7 ± 0.3 mm.
VALVE
SEAT
.SINKAGE
STANDARD
VALUE
f t
4. Check the valve seat inserts jf provided, for proper fit.
Replace any that
fit
loosely.
Valve
1.
Check the valve face and stem for excessive wear, dam-
age and distortion.
If
there is any, correct or replace the
valve.
2. If the replacement value
of
the valve head thickness is
reached, replace the valve.
3. Check each valve stem for wear and pitting in the areas
shown by the arrows
in
the illustration. If necessary, cor-
rect or replace the valve.
CHECKING
VALVE
Valve
Spring
.
1.
Check the valve springs for cracks and damage.
2. Measure the free length and load
of
each spring. Replace
the spring
if excessively deteriorated.
CHECKING
INSTALLED
LENGTH
OF
VALVE
SPRING
NOTE:
The thickness
of
the valve spring retainer collar is 1.7
± 0.3.
3.
Check the squareness
of
each spring. Replace the spring
if
it
tilts excessively.
1r
SQUAREjj~D
GAUGE
~
~
CHECKING
SPRING
SQUARENESS
Rocker
Arm
and
Rocker
Shaft
1.
Check the valve contact surface
of
each rocker arm for
excessive wear and damage. If there is any, replace the
rocker arm. Check the push rod contact surface
of
each
adjusting screw for wear and damage.
If
there is any,
replace the screw.
2. Measure the rocker arm
1.0. and shaft
0.0.
If the differ-
ence between them is excessive, replace the
rocker- arm.
REASSEMBLY
To
reassamble the cylinder head, reverse the order
of
disas-
sembly, taking care to observe the following instructions.
Engines & Generators
19
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