APRILIA SCARABEO 500 2008 Service Station Manual page 178

Engine
- Fit the pin snap ring with the pin as shown in the
figure.
Specific tooling
020470Y Pin snap ring fitting tool
NOTE
THE TOOL FOR INSTALLING THE STOP RINGS MUST BE USED MANUALLY.
CAUTION
USING A HAMMER MAY DAMAGE THE RINGS HOUSINGS.
Choosing the gasket
- First fit the piston into the cylinder, without any base gasket.
- Fit a dial gauge on the specific tool with the short union, as shown in the figure.
Specific tooling
020475Y Piston position checking tool
- With a contrasting surface, reset the dial gauge
with a preloading of a few millimetres.
- Finally fix the dial gauge.
- Check the perfect sliding of the feeler pin.
- Fit the tool on the cylinder without changing the
dial gauge position.
- Lock the tool with the original head fixing nuts.
- Rotate the crankshaft up to TDC (the reversal
point of the dial gauge rotation).
- Measure the deviation from the reset value.
- Using the chart below, determine the thickness of the cylinder base gasket to be used upon refitting.
By correctly determining the cylinder base gasket thickness, an adequate compression ratio can be
maintained
- Remove the specific tool and the cylinder.
ENG - 178
SCARABEO 500