Takeuchi TB 175 Handbuch Seite 814

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 dimen-
sion 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:
Model
3TNV82A
3/4TNV84(T) to 88
4TNV94L/98(T)
4TNV106(T)
[NOTICE]
1)If the oil clearance is excessive though the thicknesses of the journal and crankpin metals are normal or if
partial uneven wear is observed, re-grind the crankshaft and use an oversized metals.
2)If 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. If the contact surface occupies 75% or more, the metal is normal. If the con-
tact surface is insufficient, the metal interference is insufficient. Replace the metal with a new one.
(3) Thrust metal inspection
(a)Inspect any damage or wear.
(b)Measure side gap and thrust metal thickness
Side gap and thrust metal thickness
Model
3TNV82A
3/4TNV84 (T) to 88
4TNV94L•98
4TNV106 (T)
If the side gap is exceeded, use an oversized thrust metal. (Refer to point 4 of 4.4.4.)
Oversized metal (0.25 mm)
Model
3TNV82A
3/4TNV84(T) to 88
4TNV94L to 4TNV106 (T)
1.6
Finishing precision standard
of dimension R
3.5 +0.3/ 0
4.0 +0.3/ 0
Side gap
Standard Limit
0.14 to 0.22
0.28
0.13 to 0.23
0.13 to 0.23
Code No. (Up-down combination)
Crankshaft R machining
mm
Thrust metal thickness
Standard
1.930 to 1.980
1.930 to 1.980
2.430 to 2.480
119810-02940
129150-02940
129900-02940
100
Super
polishing
Ry=0.8S
Super
Thrust
polishing
face
Ry=0.8S
Crank Pin Crank Journal
mm
Limit
1.850
1.850
2.35