Iseki SCM49, Руководство по обслуживанию, Страница: 40 / 128

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SERVICE MANUAL FOR SGR19 & SGR17
Fig. 3-66
Standard value Usable limit
0.029 – 0.080 mm 0.12 mm
f. If the oil clearance of a journal is in excess of
the usable limit, replace the bearings with new
ones and check for oil clearance again. When
the clearance exceeds the usable limit ever after
new bearings have been installed, polish the jour-
nal and use undersize bearings.
Undersize bearings 0.5, 1.0 mm
When the ground-down limit of 1.0 mm is not
enough for correction, replace both crankshaft
and bearings with new ones.
• Check the pins on the crankshaft for oil clear-
ance.
a. Clean the crankshaft pins, connecting-rod big
ends, and bearings.
b. Place plasti-gauge over the pin width.
Fig. 3-67
c. Tighten the bearings on the connecting rods to
the specified torque.
Fig. 3-68
Specified torque 2.7 – 3.3 kgf·m
Note:
Hold the crankshaft securely so as not to turn
while tightening.
d. Loosen the tightening bolts and remove the con-
necting-rod bearing caps carefully.
e. Measure the most stretched parts of the plasti-
gauges.
Fig. 3-69
Standard value Usable limit
0.027 – 0.075 mm 0.12 mm
f. If the oil clearance exceeds the usable limit, re-
place the bearings with new ones and check for