Piston Pin Inspection; Small End Bearing Surface Inspection - DAELIM HISTORY 125 Service Manual

CYLINDER / PISTON
● Insert the piston ring into the bottom of the cylinder
squarely, using the piston.
● Measure the end gap using a feeler gauge. Replace the
ring if the service limit is exceeded.
NOTE
·Always replace piston ring as a set.
SERVICE LIMIT : TOP / SECOND : 0.50 mm
OIL RING (SIDE RAIL) : 1.10 mm
TOOL : FEELER GAUGE
● Measure and record the piston outer diameter 90° to the
piston pin bore and at the point specified (10mm), near
the bottom of the piston skirt.
● Replace the piston if the service limit is exceeded.
SERVICE LIMIT : 55.825 mm

PISTON PIN INSPECTION

● Measure the piston pin bore inner diameter in an X and
Y axis. Take the maximum reading to determine the
inner diameter.
● Replace the piston if the inner diameter is over the
service limit.
SERVICE LIMIT : 15.04 mm
● Measure the piston pin outer diameter at three points.
● Replace the piston pin if the service limit is exceeded.
SERVICE LIMIT : 14.960 mm
● Calculate the piston pin-to-pin bore clearance by
subtracting the piston pin outer diameter from the pin
bore inner diameter.
SERVICE LIMIT : 0.020 mm

SMALL END BEARING SURFACE INSPECTION

● Measure the inner dismeter of the connecting rod small
end.
SERVICE LIMIT : 15.060 mm
● Calculate the connecting rod small end-to-piston pin
clearance.
SERVICE LIMIT : 0.040 mm
10-4
SPECIFIED
DISTANCE
90°
1
2
3
FEELER GAUGE