Service manual
ENGINE
INSPECTION
6. Inspecting connecting
rod
bearing. Check the connect-
ing rod bearing for peeling and thennal damage.
If
it is
severe, replace the bearing.
7.
Inspecting connecting rod bearing clearance. Using the
plastigauge, measure the oil clearance
of
the connecting
rod bearing and,
if
it
exceeds the limit, replace the
connecting rod bearing.
Connecting
Rod
Cap
Torque
56.41-
57.86
ft-Ib
(7.8
-
8.0
m-kg)
Connecting
Rod
Bearing
Clearance
Standard:
0.0005
-
0.0012
in
(0.012
-
0.031
mm)
Limit:
0.0020
in
(0.05mm)
Undersize
Bearing:
0.010
in
(0.254
mm)
0.020
in
(0.508
mm)
0.030
in
(0.762
mm)
INSPECTING
~
BEARING
CLEARANCE
0 '
'"
~~
CRANKSHAFT
1.
Visual Inspection. Check the crankshaft for cracks or
other damage.
If
cracking is suspected, thoroughly clean
the crankshaft and perfonn a magnafiux check
of
the
crankshaft.
If
any cracks are detected, replace the crank-
shaft.
MAGNAFLUX
TEST
CRANKSHAFt_
--
Check for clogging
of
oil passages and,
if
clogged,
remove with compressed
air or a wire.
2.
Runout inspection. Check the crankshaft runout and,
if
it
exceeds the limit, replace the crankshaft.
Runout
Limit
0.0020
in
(0.05
mm)
CRANKSHAFT
RUNOUT
INSPECTION
RUNOUT
3. Inspecting
crank
pin
and
journal. Support the crank-
shaft on both ends using V-blocks. Measure the diameter
of
each crank pin and crankshaft main journal and,
if
the
diameter is less than the limit, refinish the crank pin and
main journal to size for the next undersize bearing.
Crank
pin
diameter
Standard
2.40601
-
2.4065
in
(61.112-
61.125
mm)
Wear
limit
0.002
in
(0.05
mm)
Main
journal
diameter
Standard
2.9848
-
2.9853
in
(75.812
-
75.825
mm)
Wear
limit
0.002
in
(0.05
mm)
a.
For the measurement on both the crank pin and the
main journal, measure them at vertical and horizontal
directions on front and rear places.
b.
When refinishing the crankshaft, it's finish to
Rlmm
as shown in the diagram.
c. Refer to the chart for refinishing dimensions
of
the
crankshaft where an undersize bearing is used.
REFINISHING
DIMENSIONS
Undersize
bearing
0.01
in
(0.254
mm)
0.02
in
(0.508
mm)
0.D3
in
(0.762
mm)
Undersize
bearing
0.D1
in
(0.254
mm)
0.D2
in
(0.508
mm)
0.D3
in
(0.762
mm)
Main
journal
diameter
2.9748
-
2.9753
in
(75.558
-
75.571
mm)
2.9648
-
2.9675
in
(75.304-
75.317
mm)
2.9578
-
2.9554
in
(75.050
•
675.063
mm)
Crankpin
diameter
2.3964
-
2.3965
in
(60.868·60.871
mm)
2.3874-
2.3865
in
(60.604
-
60.617
mm)
2.3760·2.3765
in
(60.350·60.363
mm)
R1'o.146/O.157"(3.71/3.99mm)
R2'O.126/O.142"(3.20/3.61mm)
INSPECTING
THE
CRANKSHAFT
Engines & Generators
20