PIAGGIO PORTER 1.3 16V 2008, Service Manual

Page: 278 / 892

Otherwise, rework the valve seat.
KEY:
B = Contact surface at the centre of the valve
C = Contact surface length
Valve seat rectification
1. Rectification for inlet valve seats
•
With a mill at 45°, remove the surface
unevenness of the area making con-
tact with the valve seat, only as much
as to obtain an even surface.
KEY:
A = Intake
•
With a mill at 30°, rework the valve seat
so that the largest diameter of the ma-
chining operation at 45°, is 29 ± 0.1
mm.
KEY:
B = Inlet seat
•
With a mill at 70°, work the seat so that,
the length of the surface machined with
the mill at 45°, turns equal to 1.4 mm.
•
With the mill at 45°, remove any burrs
which are produced during previous
machining operations with mills at 30°
and 70°.
Engine
PORTER 1.3 16V
EN - 278