Sealing Rings; Removing The Piston - APRILIA scarabeo 125 i.e. Service Station Manual

SCARABEO 125 i.e. - 200 i.e.
Inspecting the piston rings
Specification
Compression ring (top)
Compression ring (middle)
Oil scraper ring
Top ring maximum value
Middle ring maximum value

Removing the piston

- Install piston and pin onto the connecting rod, with the piston arrow aligned facing the exhaust.
- Fit the pin retainer ring on the appropriate tool.
Specific tooling
020705Y Piston seeger ring fitting
- With the opening in the position indicated on the
tool, set the retainer ring into position with the
punch.
- Fit the pin stop ring using the plug as shown in
the figure.
NOTE
THE TOOL FOR INSTALLING THE RETAINER RINGS MUST
BE USED MANUALLY.
CAUTION
USING A MALLET TO SET THE RINGS IN POSITION MAY
DAMAGE THE RING SEATS.
Choosing the gasket
•
Temporarily, fit the piston to the cylin-
der, without base or head gasket.
•
Fit a dial gauge on the specific tool.
•
Zero set the dial gauge on the cylinder
top surface and fit it on the two adja-
cent stud bolts.
•
Remove the dial gauge and refit it on
the two stud bolts on the opposite an-
gles. Now measure again.
Specific tooling
AP8140266 Comparator door

SEALING RINGS (125 / 200)

Desc./Quantity
0.2 / 0.35 mm (0.0079 / 0.014 in)
0.2 / 0.35 mm (0.0079 / 0.014 in)
0.2 / 0.7 mm (0.0079 / 0.027 in)
0.45 mm (0.18 in)
0.45 mm (0.18 in)
Engine
ENG - 111