Service manual
ENGINE
INSPECTION
5.
Inspecting
piston
ring end gap. Position the piston
ring into the bottom
of
the cylinder liner. Measure the piston
ring
end
gap and,
if
it
exceeds the limit, replace the ring.
Piston
Ring
End
Gap
Limit
71Bn1C
1.5
mm
(0.59J.in)
. Be sure to position
the
piston ring below the ring sliding
surface
of
the cylinder liner.
6.
Inspecting connecting rod bearing. Check the
connecting rod bearing for peeling and thermal 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.
\
Con~ecting
Rod
Bearing Clearance
! 71 B Standard: 0.012 - 0.031
mm
(0.0005 -
0.0012
in)
Limit:
0.05
mm
(0.002 in)
71 C Standard: 0.036 - 0.076
mm
(0.0014 - 0.0030 in)
Limit:
0.10
mm
(0.004 in)
Undersize Bearing:
0.254
mm
(0.010 in)
0.508
mm
(0.020 in)
0.762
mm
(0.030 in)
CONNECTING
ROD
BEARING
CLEARANCE
Connecting
Rod
Cap
Tightening Torque
71
B 7.8 - 8.0
m-kg
(56 - 58 ft-lb)
.
71
C 6.9 -
7.5
m-kg
(50 - 54 ft-lb)
CRANKSHAFT
1.
Visual Inspection.
Check
the crankshaft for cracks or
other damage.
If
cracking
is
suspected, thoroughly clean the
crankshaft and perform a
color
test on the shaft, or run a can-
dle flame over the crankshaft
and
look for oil seepage from
cracks.
If
any cracks are
detec~,
repl~ce
the crankshaft.
PERFORMING
A
COLOR
TEST
CRANKSHAFT
........
Check for clogging
of
oil passages and,
if
clogged, remove
with compressed
air
or
wire.
2.
Runout inspection.
Check
the crankShaft runout and,
if
it exceeds the limit, replace
the
crankshaft.
Runout Limit
71Bn1C
0.05
mm
(0.0
1
020 in)
CRANKSHAFT
RUNOUT
..INSPECTION
GAUGE
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 diame-
ter is less
than the limit, refinish the crank pin and main jour-
nal to size for the next undersize bearing.
71B
Crank
pin
standard diameter
57.112 - 57.125
mm
(2.2485 - 2.2491 in)
Main journal standard diameter
69.812 - 69.825
mm
(2.7485 - 2.7491 in)
71C
Crank
pin
standard diameter
53.0 - 53.013
mm
(2.0866 - 2.0861 in)
Main journal standard diameter
65.0 - 65.013
mm
(2.5591 - 2.5596 in)
Wear
limit
0.05mm
(0.002
in)
Wear
limit
0.05mm
(0.002 in)
Wear
limit
0.05mm
(0.0020
in)
Wear
limit
0.05mm
(0.0020
in)
Engines & Generators
19