107
Dimension R and finishing precision of crankshaft
journal and pin
As for grinding processing of journal and pin,
machine it by using the grinding wheel of the
dimension R of below table.
Surface finishing precision standard on journal
and pin:
Ry=0.8S super polishing
Surface finishing precision standard on the thrust
side of crankshaft arm:
mm
Model
Finishing precision standard of
dimension R
3/4IRH2N-8N
3.5 +0.3/ 0
4IRI8T
4.0 +0.3/ 0
[NOTICE]
1) lf the oil clearance is excessive though the thicknesses of the iournal and crankpin metals are normal or
if partial uneven wear is observed, re-grind the crankshaft and use an oversized metals.
2) lf rust or surface roughening exists on the rear side of the metals, coat it with blue or minimum. Then
assemble the crankpin metal to the connecting rod, and tighten the rod bolt to the specified torque to check
the metal for contact. lf the contact
surface occupies 75% or more, the metal is normal. lf the
contact surface is insufficient, the metal interference is insufficient. Replace the metal with a
new one.
(27) Thrust metal inspection
(a) Inspect any damage or wear.
(b) Measure side gap and thrust metal thickness
Side gap and thrust metal thickness mm
Side gap
Thrust metal thickness
Model
Standard
Limit
Standard
Limit
3/4IRH8N
0.14 0.22
-
1.930 1.980
1.850
4IRI8N
0.13 0.23
-
1.930 1.980
1.850
If the side gap is exceeded, use an oversized thrust metal.
Oversized metal (0.25mm)
Code No.
-
Upper
Lower
Standard thickness (mm)
3IRH2N
???119810-02940
(Up-down combination)
2.15
3/4IRH8N
129150-02940
(Up-down combination)
2.15
4IRI8N
129900-02370
129900-02360
2.055 2.105
