APRILIA SCARABEO 500 2008 Service Station Manual page 181

SCARABEO 500
Inspecting the timing system components
- Check that the guide slider and the tensioner pad
are not excessively worn.
- Check that the timing system gear unit controlling
the camshaft and the crankshaft pinion is not worn.
- If signs of wear are found in the pads, replace
them; if the chain, or sprocket are worn, replace
the whole unit.
NOTE
IF THE CHAIN HAS DAMAGED THE PINION, REPLACE THE CRANKSHAFT AS DESCRIBED IN
THE «CRANKCASE AND CRANKSHAFT» CHAPTER.
Chain tensioner:
- Remove the central screw with the washer and
the tensioner spring. - Check that the one-way
mechanism is not worn.
- Check the condition of the tensioner spring.
- If signs of wear are found, replace the whole as-
sembly.
Inspecting the valve sealings
- Visually inspect the valve sealing surface.
CAUTION
DO NOT CHANGE THE VALVE FITTING POSITION (RH - LH).
- Replace the valve with a new one if its sealing
surface is damaged at one or more points or
curved.
Engine
ENG - 181