Takeuchi TB 175 Handbuch Seite 811

(2) Crankshaft
Mainly check seizure and wear of the crankpins and
journals. Since the crankshaft gear is shrink-fitted, heat
to 180 to 200°C when extraction is necessary.
(a)Shaft portion color check
After washing the crankshaft, inspect it by means of
color check or a magnaflux inspector. Replace it if
cracked or heavily damaged. Slight defects shall be
corrected by grinding.
Crankshaft bend
(b)
Support the crankshaft journals at both ends with V-
blocks. Use a dial gage and measure the runout at the
center journal while rotating the shaft to inspect the
bend.
Limit 0.02 mm or less
(c)Crankpin and journal measurement
Measure the outside diameter, roundness and taper at
each crankpin and journal.
Correct by grinding if unevenly wear, roundness
exceeding the limit or insufficient outside diameter is
found. Replace if the defect is excessive.
Item
Roundness
Taper
To look for the oil clearance of crank pin, measure the
inside diameter of crank pin metal according to (5) (d)
described later and calculate.
Limit (Diameter)
(mm)
0.01
4. Disassembly, inspection and reassembly of engines
Inspection by color check
Bend
Deflection
V-block
Crankshaft bend measurement
Measuring position of the crankpin
and crank journal
97
Dial gage
V-block
Crankshaft
journal
Crankpin