Service manual
ENGINE
INSPECTION
ROCKER
ARM
CYLINDER
BLOCK
1.
Visual Inspection. Check each component part
of
the
1.
VISUal
Inspection. Check the cylinder block for cracks
rocker arm assembly for cracks or other damage. Check and damage.
If
necessary, repair or replace it entirely.
if
the oil passages
of
the rocker arm ana shaft are clog- Check to see that oil or cooling water passages are not
ging and,
if
necessary, repair or replace the rocker arm. clogged and,
if
clogged, remove
~ith
compressed air or a
1m-JAM
NUT
SPRING
WASHER
.
_~~
~
wire probe.
REMOVING
LOCATING
DOWELS
Q;;II
~>@J
~
BEFORE
INSPECTING
A.
_____
ADJ.
SCREW
\
lr
~
RETAINING
~-_B:e.)e_~
~-~BUSHING'
. .
RING
~C>
~o
_~
:o~
'Q~e~a~&
ROCKER
t "
w'
JII
"
!to
If
, "
~
TAPER
PIN
RECESS
2.
Distortion Inspection. Check the gasket face distortion
ROCKER
SHAFT
~
SPRING
,0
""~.
~~
of
the cylinder block and
if
it exceeds the limit, repair or
SUPPORT
~~
. -CJtt replace it.
~~
---=-------
....
()
\
Distortion
limit:
1,2
0.004
in
(0.10mm)
_~
ROCKER
ARM
ASSEMBLY
SCALLOP
1 3,4,5,6
0.010
in
(0.25mm)
2.
Inspecting clearance between rocker
arm
and
shaft.
Check the clearance between the rocker arm and shaft
and,
if
it exceeds the limit, replace the rocker arm bush- 6
ing or shaft.
4----J~~~"""
Clearance
Standard
0.0006
-
0.0024
in
(0.016
-
O.061mm)
Limit
0.0028
in
(0.07mm)
3.
Rocker
Arm
Bushing Replacement. Using a suitable
mandrel and press, press out the old bushing. Aligning
the oil passages
of
the rocker arm bushing, press the new
bushing into the rocker arm. After the rocker arm bushing
has been replaced, ream the bushing bore with a spiral
expansion reamer so that the clearance between the
bush-
ing and shaft becomes equal to' the standard clearance.
REPLACING
THE
BUSHING
CYLINDER
LINER
1.
Wear Inspection. Measure the liner bore at three
positions
of
upper, middle and lower portions with a
cylinder gauge in X-X and
Y-
Y directions
as
shown.
If
wearing exceeds the limit, replace the liner.
Cylinder
Liner
Bore
3.7412
-
3.7422
in
(95.025
-
95.050mm)
Wear
Limit
0.008
in
(0.20
mm)
y
X--!+--
--t+--X
2
x -X
IS
THE
THRUST
DIRECTION
~
CYLINDER
LINER
CYLINDER
LINER
~~_~
WEAR
INSPECTION
Engines & Generators
17