Takeuchi TB108 Werkstatt-Handbuch Seite 314

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.
Finishing precision standard of dimension R
3.5
Surface finishing precision standard on journal and
pin:
Ry=0.8S super polishing
Surface finishing precision standard on the thrust side
1.6
of crankshaft arm:
[NOTICE]
1)lf the oil clearance is excessive though the thickness
of the journal and crankpin metals are normal or if
partial uneven wear is observed, re-grind the crank-
shaft and use an undersized 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. If the contact surface
occupies 75 % or more, the metal is normal. If the
contact surface is insufficient, the metal interference
is insufficient. Replace the metal with a new stan-
dard 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
Side gap
Standard Limit
0.111 to 0.250 0.30
If the side gap is exceeded, use an oversized thrust
metal.
Oversized metal (0.25 mm)
Code No. (assy)
119810-02940
(R.1)
mm
+
0 3 .
0
Thrust metal thickness
Standard Limit
1.930 to 1.980 1.850
Standard thickness
2.055 to 2.105
mm
mm
81
Super
polishing
Ry=0.8S
Super
Thrust
polishing
face
Ry=0.8S
Crank Pin Crank Journal
Crankshaft R machining