112
(d) Rod big end measurement
Measure the crankpin and bushing according to
4.4.5.(2)(c) described above.
Calculate the oil clearance of a crank pin metal and a
crank pin from the measured values of the crank pin
metal inner diameter and the crank pin outside
diameter.
Replace a crank pin metal if the oil clearance becomes
about the limit dimension of the below table.
Correct by grinding if unevenly wear, roundness
exceeding the limit or insufficient outside diameter is
found. Also use an undersized metal. (Refer to the
above (2) c.)
[NOTICE]
When measuring the inside diameter of the rod big
end, install the crankpin metals in the rod big end
not to mistake the top and bottom of the metals and
tighten the rod bolts by the standard torque.
Tightening torque of rod bolt
Model
Tightening torque
Nm(kgf-m)
Lubricating oil application
(threaded portion, and bearing seat surface)
3IRH2N
37.2 41.2
(3.8 4.2)
3/4IRH8N
44.1 49.0
(4.5 5.0)
4IRI8N
53.9 58.8
(5.5 6.0)
Lube. oil applied
Standard of rod big end mm
Model
Item
Standard
Limit
Rod I.D. bushing
42.952 42.962
42.902
Crankpin O.D.
43.000 43.042
-
Metal thickness
1.487 1.500
-
3IRH2N
Clearance
0.038 0.090
0.150
Rod I.D. bushing
47.952 47.962
47.902
Crankpin O.D.
48.000 48.026
-
Metal thickness
1.492 1.500
-
3/4IRH8N
Clearance
0.038 0.074
0.150
Rod I.D. bushing
57.952 57.962
57.902
Crankpin O.D.
58.000 58.026
-
Metal thickness
1.492 1.500
-
4IRI8N
Clearance
0.038 0.074
0.150
