Crankshaft - Mitsubishi S3L Service Manual

INSPECTION
Figure 100 Checking connecting rod for bend with a
dial indicator
Measuring diagram
Figure 101 Measuring bore in connecting rod bearing
Measuring diagram
Figure 102 Measuring diameter of crankpin
Service Manual Mitsubishi SL-Series diesel engines
Version 08/2004
3.55 ± 0.25 kgf m
(25.7 ± 1.8 lbf ft)
[34.8 ± 2.5 N m]
ENGLISH
CYLINDER BLOCK, CRANKSHAFT,
PISTONS AND OIL PAN
3) To check the connecting rod fitted to the piston
for bend, put the connecting rod and piston
on the surface plate as shown in the
illustration, insert a round bar having a
diameter equal to that of the crankpin into the
bore in the big end of the rod and measure "A"
and "B" with a dial indicator. Subtract "A" from
"B" to find the bend ("C").

19.3 Crankshaft

1. Clearance between crankpin and connecting rod
bearing
1) Install the bearing (upper and lower halves)
and cap to the big end of the connecting rod
and tighten the cap nuts to the specified
torque. Measure the bore in the bearing for
crankpin as shown in the illustration.
Tightening torque
2) Measure the diameter of the crankpin as
shown in the illustration to find the clearance
between the crankpin and connecting rod
bearing.
Norminal
Item
size
Diameter of
48
crankpin
(1.89)
(standard)
Clearance
between
crankpin and —
connecting
rod bearing
3) If the clearance exceeds the limit, install a new
bearing and check the clearance again.
4) If the clearance still exceeds the limit, grind
the crankpin to 0.25 mm (0.0098 in.), 0.50 mm
(0.0197 in.) or 0.75 mm (0.0295 in.) undersize
and use undersize connecting rod bearing.
3.55 ± 0.25 kgf.m
(25.7 ± 1.8 lbf.ft)
[34.8 ± 2.5 N.m]
.Unit: mm (in.)
Standard Limit
47.950 to
47.965
—
(1.887 79 to
1.888 38)
0.025 to 0.072 0.150
(0.000 98 to (0.005
0.002 83) 91)
75 / 195