Service manual
ENGINE
INSPECTION
ROCKER
ARM
1.
Visual Inspection. Check each component part
of
rocker arm assembly for cracks or other damage. Check
if
the oil passages
of
the rocker arm and shaft are clogging and,
if
necessary, repair or replace it.
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RETAINING
RING.......
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BRACKET
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,
SPRING
WASHER
TAPER
PIN
RECESS
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SCALLOP
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 bushing or shaft.
Clearance Standard
71
an1C
0.016 - 0.061 (0.0006 - 0.0024 in)
limit -
0.07mm (0.003 in)
3.
Rocker Arm Bushing Replacement Using a suitable
mandrel and press, press out the bushing. Aligning the oil
passages
of
the rocker arm bushing, press the bushing into
the rocker arm. After the rocker arm bushing has been
replaced, ream the bushing bore with a reamer so that the
clearance between the bushing and shaft becomes equal to
the standard clearance.
REPLACING
THE
BUSHING
,
REAMING
THE
BUSHING
BORE
TAPPET
1.
Visual inspection.
Check
the tappet for cracks and
other damage and,
if
damaged
replace the tappet. Check for
abnormal wear
of
the portion
of
the tappets that contact
with the cam, and
if
anyone
is abnormally worn, replace
the tappet.
2.
Inspecting Clearance Between Tappet and Tappet
Bore.
Check the clearance between the tappet and tappet
bore and,
if
the clearance
is
greater than the limit, replace the
tappet or cylinder block.
Clearance Limit
71an1C
0.10
mm
(0.004 in)
TAPPET
CLEARANCE
CYLINDER
BLOCK
..
1.
Visual Inspection.
Check
the cylinder block for cracks
and damage.
If
necessary, repair or replace it entirely Check
to see that oil or cooling water passages
ar" not clogged and,
.
if
clogged, remove with compressed air or a wire probe.
REMOVE LOCATING DOWELS
BEFORE
INSPECTING
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2.
Distortion Inspection. Check the gasket face distortion
of
the cylinder block
and
if
it
exceeds the limit, repair or
replace it.
Distortion limit:
71
ani
C
(1)
(2)
(3) (4)
0.10
mm
(0.004 in)
0.25
mm
(0.010 in)
.
DISTORTION
INSPECTION
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2
Engines & Generators
16