Inspecting The Small End - VESPA LX 4T USA Workshop Manual

LX 4T USA
Removing the cylinder - piston assy.
- Remove the cylinder paying attention to the 2
cylinder centring dowels in the housing.
- Remove the cylinder base gasket.
To avoid damaging the piston, keep it fixed while
removing the cylinder.
- Remove the two stop rings, the wrist pin and the
piston.
- Remove the 3 piston rings.
N.B.
BE CAREFUL NOT TO DAMAGE THE PISTON RINGS DUR-
ING 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 ALLOWED, SHOWS SIGNS OF
WEAR OR OVERHEATING REPLACE THE CRANKSHAFT
AS DESCRIBED IN THE "CRANKCASE AND CRANK-
SHAFT" CHAPTER".
Characteristic
Max. diameter admitted: check the small end
13.030 mm
Standard diameter check the small end
13 +0.025+0.015mm
Engine
ENG - 87