Fig
.
1-35
Fig.1-37
IN. 40.9mm
(1.61 in)
EX. 37.9mm
(
1.49
i
n)
1
1-C-10.
Checking
Valve
Seat
Sinking
Check the sinking
of
the
valve
seat by using a vernier
calipers
as
shown in Fi
g.
1
-3
5.
If
the sinking exceeds 0.5
mm
(0.020 in), washers
of
sufficie
nt
thickness
to
compensate the sinking mu
st
be
placed under the springs so
as
to
maintain the specified
spring pressure.
If
it
is
more than 1.5
mm
(0.059 in),
replace the valve.
1-C-11.
Checking
Rocker
Arm
and
Shaft
The standard clearance between the rocker arm bore
and shaft
is
0.
027
- 0.081
mm
(0.0011 - 0.0032 in).
Inspect the clearance and
if
it
is
more
than 0.10
mm
(0.004 in), replace the rocker arm or shaft.
1-
C- 12.
Checking
Cylinder Block
Clean t
he
cylinder block with a suitable solvent. Spe-
cial care must be taken when cleaning the oil pas-
sages, coolant passages and cylinder bore
to
remove
all sludge, dirt and carbon deposit. After cleaning,
use compressed air to dry the block thoroughly.
Examine the cylinder block for crack and any damage.
Examine
all
machined surfaces
of
the block for burrs
and scores.
Check the cylinder block for distortion in the same
way,
as
described in Par. l
-C-1.
Distortion limit
0.
15
mm (0.006 in)
1 : 10
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