Zenoah G320PUM Owner's Manual page 15

Maintenance
3) MAINTENANCE SPECIFICATIONS
Items
Bore (mm)
Cylinder
Diameter (mm)
Piston Ring
Groove width (mm)
Piston Pin Hole (mm)
Piston
Clearance between
Piston and
Cylinder (mm)
Clearance between
Groove and
Piston Ring (mm)
End Gap (mm)
Piston
Ring
Width (mm)
Piston Pin Diameter (mm)
Connecting Rod Small end (mm)
Crankshaft Dia. at Main Bearing (mm)
Eccentricity (mm)
Axial Play (mm)
Main Bearing
G320PUM
Standard Limit
ø38 Plating damaged
ø37.97 ø37.87
1.01 1.11
ø9.01 ø9.05
0.03~0.06 0.15
0.02~0.04 0.1
0.1~0.3 0.5
0.98 0.93
ø9 ø8.98
ø12 ø12.05
ø12 ø11.98
— 0.07
— 0.5
Gritty orr
—
Feels Flat Spot
Measuring Device Remarks
Eye Checking
At the skirt end and
Micro Meter
the right angle to the
piston pin.
Thickness Gauge
Cylinder Gauge
Micro Meter
Cylinder Gauge
Thickness Gauge
When inserted in
Thickness Gauge
a new cylinder.
Micro Meter
Micro Meter
Cylinder Gauge
Micro Meter
Dial Gauge
Thickness Gauge
—
15