Takeuchi TB108 Werkstatt-Handbuch Seite 319

(d)Rod big end measurement
Measure the crankpin outside diameter.
The oil clearance is calculated as the difference in the
crankpin outside diameter and the crank pin metal inside
diameter (refer to 4.4.5.(2)(c) ).
Replace the crankpin metal if a clearance becomes
close to the limit value in the table below.
If wear and unevenly wear on the crankpin is found,
correct by grinding the crankpin and apply the
undersized bushing (refer to 4.4.5.(2)(c) )
[NOTICE]
When measuring the inside diameter of the rod big
end, install the bushing in the rod big end not to
mistake top and bottom of the crankpin metal and
fasten the rod bolts by the standard torque shown in
the table.
Tightening torque of rod bolt
Tightening torque
22.6 to 27.5 (2.3 to 2.8)
Standard of rod big end
Item
Crankpin O.D. 41.952 to 41.962
Metal I.D. 41.982 to 42.002
Metal thickness 1.503 to 1.509
Clearance 0.020 to 0.058
(6) Tappet
Mainly check the tappet contact surface with the cam
and push rod. Slight surface defects shall be corrected
with an oilstone.
Tappet stem outside diameter measurement
The outside diameter of the tappet stem is measured by
a micrometer.
The clearance is calculated from the measured tappet
hole and the measured stem diameter.
Item
Tappet hole I.D. 21.000 to 21.021
Stem O.D. 20.927 to 20.960
Clearance 0.040 to 0.094
N•m (kgf•m)
Lube oil application
(threaded portion,
and bearing seat surface)
Lube. oil applied
Standard Limit
41.900
-
-
0.120
Standard Limit
21.041
20.907
0.134
4. Disassembly, inspection and reassembly of engines
Crankpin metal I.D. measurement
mm
Abnormal contact
surface
mm
(Tappet stem outside diameter measurement)
86
Cylinder gage
Normal contact
surface
Tappet
(R.1)