PIAGGIO MP3 400 i.e. - Inspecting the Piston

- Calculate the coupling clearance between pin
and connecting rod end.
Characteristic
Standard clearance:
0.015 ÷ 0.029 mm
Inspecting the piston
- Measure the capacity diameter on the piston.
Characteristic
Standard diameter:
22 + 0.006 + 0.001 mm
- Calculate the piston pin coupling clearance.
N.B.
THE PIN HOUSINGS HAVE 2 LUBRICATION CHANNELS. FOR THIS REASON, MEASUREMENT
MUST BE MADE ACCORDING TO THE PISTON AXIS.
Characteristic
Standard clearance:
0.001 ÷ 0.010 mm
- Measure the outside diameter of the piston, per-
pendicular to the gudgeon pin axis.
- Take the measurement in the position shown in
the figure.
N.B.
REFER TO THE «SPECIFICATIONS» SECTION
FOR THE SIZES OF THE PISTON AND THE
CYLINDER-PISTON COUPLING CLEARAN-
CES.
Characteristic
A:
10 mm
Piston diameter:
85.8 mm nominal value
Engine MP3 400 i.e.
ENG - 56