APRILIA SCARABEO 500 2008 Service Station Manual page 188

Engine
- Check there are no signs of wear on the auto-
matic valve-lifter cam, the end-of-stroke roller and
the rubber buffer on the automatic valve lifter re-
taining cover.
- Check that the automatic valve-lifter return spring
is not deformed by over-stretching.
- Replace any defective or worn component.
- Check there are no signs of wear or scoring on the rocking lever pins.
Characteristic
Standard diameter:
Ø 13 - 0.010 -0.018 mm
- Check the inside diameter of each rocking lever.
Characteristic
Standard diameter:
Ø 13 + 0.026 +0.015 mm
- Check there are no signs of wear on the contact pads with the cam and on the articulated plate of the
set screws.
- In case of wear, replace the component.
Refitting the head and timing system components
- Fit the chain guide slider.
- Fit the two centring dowels between head and
cylinder.
- Fit the head gasket.
NOTE
THE FIGURE SHOWS THE FITTING POSITION OF THE TWO CENTRING DOWELS BETWEEN
HEAD AND CYLINDER. THE DIRECTION OF FITTING FOR THE GASKET IS FORCED BY THESE
DOWELS.
ENG - 188
SCARABEO 500