Yanmar 3TNV Series Service Manual page 115

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:
Ry=0.8S super polishing
Surface finishing precision standard on the thrust
side of crankshaft arm:
Finishing precision standard of
Model
3TNV82A
TNV84 88
4TNV94L/98(T)
4TNV106(T)
[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
is normal. lf the contact surface is insufficient, the metal interference is insufficient.
Replace the metal with a new one.
(1) Thrust metal inspection
(a) Inspect any damage or wear.
(b) Measure side gap and thrust metal thickness
Side gap and thrust metal thickness
Model
Standard
TNV82A 88 0.14 0.22
4TNV94L 98 0.13 0.23
4TNV106(T) 0.13 0.23
If the side gap is exceeded, use an oversized thrust metal.
Oversized metal (0.25mm)
-
Upper
3TNV82A
(Up-down combination)
TNV84 88
(Up-down combination)
4TNV94L 98 129900-02370
4TNV106(T) 123900-02370
dimension R
3.5 +0.3/ 0
4.0 +0.3/ 0
Side gap
Limit
-
-
-
Code No.
Lower
???119810-02940
129150-02940
129900-02360
123900-02360
mm
surface occupies 75% or more, the metal
Thrust metal thickness
Standard Limit
1.930 1.980 1.850
1.930 1.980 1.850
2.430 2.480 2.35
Standard thickness (mm)
2.15
2.15
2.055 2.105
2.555 2.605
100
mm