Inspecting The Small End - PIAGGIO Vespa LX 150 4T Euro 3 Service Station Manual

Vespa LX 125 - 150 4T Euro 3
- Remove the two stop rings, the wrist pin and the
piston.
- Remove the 3 piston rings from the piston.
N.B.
BE CAREFUL NOT TO DAMAGE THE PISTON
RINGS DURING REMOVAL.

Inspecting the small end

- Measure the internal diameter of the small end
using an internal micrometer.
N.B.
IF THE DIAMETER OF THE ROD SMALL END
EXCEEDS THE MAXIMUM DIAMETER AL-
LOWED, SHOWS SIGNS OF WEAR OR OVER-
HEATING REPLACE THE CRANKSHAFT AS
DESCRIBED IN THE "CRANKCASE AND
CRANKSHAFT" CHAPTER".
Characteristic
Checking the connecting rod small end: Maxi-
mum diameter
15.030 mm
Checking the connecting rod small end: Stand-
ard diameter
15 +0.015+0.025 mm
Inspecting the wrist pin
- Check the outer diameter of the gudgeon pin.
Characteristic
Standard pin diameter
14.996 ÷ 15 mm
Minimum diameter permitted
Ø 14.994 mm
Engine
ENG - 27