Yanmar 3TNV Series, Service Manual

Page: 115 / 213

4. Disassembly, Inspection and Reassembly of Engines
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:
Code No.
Standard thickness (mm)
Ry=0.8S super polishing
Surface finishing precision standard on the thrust
side of crankshaft arm:
Upper Lower
3TNV82A
???119810-02940
mm
Model
Finishing precision standard of
dimension R
(Up-down combination)
2.15
TNV84 88
3TNV82A
TNV84 88
3.5 +0.3/ 0
129150-02940
(Up-down combination)
2.15
TNV82A 88 0.14 0.22 - 1.930 1.980 1.850
4TNV94L 98 0.13 0.23 -
4TNV106(T) 0.13 0.23 - 2.430 2.480 2.35
If the side gap is exceeded, use an oversized thrust metal.
Oversized metal (0.25mm)
4TNV94L/98(T)
4TNV94L 98 129900-02370
4TNV106(T)
4.0 +0.3/ 0
[NOTICE]
129900-02360 2.055 2.105
4TNV106(T)
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.
123900-02370 123900-02360 2.555 2.605
(1) 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
Model
Thrust metal thickness
Standard Limit Standard Limit
1.930 1.980 1.850
-
100