Piston Pin Inspection; Small End Bearing Surface Inspection - DAELIM ROADWIN VJ125 Service Manual

CYLINDER / PISTON
PISTON RING
90
SPECIFIED
DISTANCE
10-4
FEELER GAUGE
CYLINDER GAUGE
Insert the piston ring squarely into the bottom of the
cylinder, using the piston.
Push the rings into the cylinder with the top of the
piston to be sure they are squarely in the cylinder.
Measure the end gap using a feeler gauge. Replace the
ring if the service limit is exceeded.
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 : 56.370 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 : 15.040 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