Mitsubishi S4Q User Manual page 69

ENGINE MAIN PARTS
Measuring
Measuring
points
directions
Figure 118 Measuring connecting rod bearing
Measuring
Measuring
points
directions
Figure 119 Measuring crankpin
Service Manual Mitsubishi SQ-Series diesel engines
Version 08/2004
10.2.3 Crankshaft
54 ± 5 N·m
(5.5 ± 0.5 kgf·m)
[40 ± 4 lbf·ft] 1.
Diameter of
crankpin
(standard)
Oil clearance
Undersize
of crankpin
ENGLISH
PISTONS, CONNECTING RODS,
CRANKSHAFT AND CRANKCASE
Checking oil clearance of connecting rod bearing
1) Install the upper and lower halves of the
bearing and the cap to the connecting rod,
and tighten the cap nuts to the specified
torque. Measure the inside diameter of the
bearing, as shown in the illustration.
Tightening torque
2) Measure the diameter of the crankpin of the
crankshaft, as shown in the illustration, and
subtract the diameter of the crankpin from the
inside diameter of the bearing (Step (1)). The
difference is the oil clearance of the
connecting rod bearing.
Nominal
Item
Value
57.955 to 57.970
58
[2.28]
__
3) If the oil clearance exceeds the repair limit,
replace the bearing and recheck the oil
clearance.
4) If the oil clearance still exceeds the repair
limit, use 0.25 mm [0.0098 in.], 0.50 mm
[0.0197 in.] or 0.75 mm [0.0295 in.] undersize
bearings. When using undersize bearings,
refinish the crankpins to any of the undersizes
listed below.
0.25
57.75
[0.0098]
0.50
57.50
[0.0197]
0.75
57.25
[0.0295]
54 ± 5 N·m
(5.5 ± 0.5 kgf·m)
[40 ± 4 lbf·ft]
Unit: mm [in.]
Assembly Repair
Standard Limit
[2.2817 to __
2.2823]
0.03 to 0.09
0.20
[0.0012 to
[0.0079]
0.0035]
Unit: mm [in.]
Finishing dimension
– 0.030 – 0.0012
[2.2736 ]
– 0.045 – 0.0018
– 0.030 – 0.0012
[2.2638 ]
– 0.045 – 0.0018
– 0.030 – 0.0012
[2.2539 ]
– 0.045 – 0.0018
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