Service manual
ENGINE
INSPECTION
4.
Inspecting crankshaft
end
play. Check the end play
of
the crankshaft and,
if
the
end
play exceeds the limit,
replace the thrust washer with
0.007 in (0.178 mm) over-
size. Crankshaft end play is measured by setting a dial
gauge
on
the rear end
of
the crankshaft and moving the
crankshaft in the axial direction.
Crankshaft
End
Play
Standard:
0.0055
-
0.0154
in
(0.14
-
0.39
mm)
Crankshaft
End
play
limit:
0.0157
in
(0.40
mm)
MAIN
BEARING
1.
Inspecting main bearing. Check the main bearing
for peeling, seizure or fusion and,
if
necessary, replace
the bearing.
2.
Inspecting main bearing
clearance~
Using the
plastigauge, measure the oil clearance and,
if
it
exceeds
the limit, replace the main bearing.
PLASTIGAUGE
Oil
Clearance
Standard:
0.0023
-
0.0035
in
(0.059
-
0.090
mm)
Oil
Clearance
Limit:
0.005
in
(0.12
mm)
CAMSHAFT
1.
Visual Inspection. Check the camshaft for cracks and
damage.
If
necessary, replace the camshaft.
NOTE:
If
the
damage
is
slight, you
may
be able
to
correct
the
camshaft
with
an oil soaked fine emery grindstone.
Take
special
care
to
not damage
the
original
cam
form.
2. Inspecting cam height. Measure the cam height and,
if
it
is less than the limit, replace the camshaft.
Cam
height
limit:
1.6724
in
(42.478
mm)
INTAKE
AND
EXHAUST
CAM
CAM
"ElGKT
r::w-
INSPECTING
THE
CAMSHAFT
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3. Inspecting camshaft journal. Check the camshaft
journal and,
if
wearing exceeds the limit, replace the
camshaft.
No.1
No.2
NO.3
No.4
Diameter
of
Joumal
2.0437
-
2.0449
in
(51.910
-
51.940
mm)
2.0339
-
2.0350
in
(51.660
-
51.690
mm)
2.0240
-
2.0252
in
(51.410
-
51.440
mm)
2.0142
-
2.0154
in
(51.160
-
51.190
mm)
Wear
Limit
0.008mm
(0.0003
in)
4. Inspecting camshaft oil clearance. Check the clearance
between the camshaft journal and the camshaft support
bore as follows:
a. Measure the camshaft journal diameter and the
camshaft support bore.
b.
Calculate the clearance and replace the camshaft or
cylinder block
if
the clearance exceeds the limit.
Oil
clearance
limit
0.0057
in
(0.145
mm)
5. Checking camshaft alignment, and,
if
it
exceeds the
limit, replace the camshaft.
Maximum
allowable
runout
0.0031
in
(0.08
mm)
6.
Inspecting camshaft
end
play.
a.
Install the thrust plate, camshaft gear,
frictio~ear,
lock plate and camshaft gear lock bolt on the camshaft.
b.
Tighten the lock bolt to the specified torque.
Lock
Bolt
Torque
(19mm
socket)
46
-
691b/ft
(6.4
-
9.5
kg/m)
c. Measure the clearance between the thrust plate and
camshaft gear.
If
it
exceeds the limit, replace the thrust
plate.
End
play
limit
0.0118
in
(0.3
mm)
CAMSHAFT
GEAR
IDLER
GEAR
BUSHING
AND
IDLER
GEAR
SPINDLE
1.
Visual inspection. Check for damage on the bushing
inner surface
of
the idler gear and the spindle sliding sur-
face and,
if
necessary, replace the idler gear
or
spindle.
Check the oil passage for clogging and,
if
necessary,
clean the passage with compressed
air or wire.
2.
Inspecting clearance between bushing
and
spindle.
Check the clearance between the idler gear bushing and
the spindle and,
if
it exceeds the limit, replace the idler
gear or spindle.
Clearance
Standard:
0.0013
-
0.0033
in
(0.034
-
0.084
mm)
Clearance
Limit:
0.006
in
(0.15
mm)
Engines & Generators
21