Inspecting the piston rings
NOTE
TO MEASURE WEAR LIMITS AND COUPLING CLEARANCES, SEE THE SPECIFICATIONS CHAP-
TER.
See also
Interventions rules
Removing the piston
- Install piston and wrist pin onto the connecting
rod, aligning the piston arrow the arrow facing to-
wards the exhaust.
- Fit the pin stop ring onto the appropriate tool.
Specific tooling
020430Y Pin lock fitting tool
- With the opening in position indicated on the tool,
take stop ring in the closed position using the
punch.
- Fit the wrist pin stop using the plug as shown in
the figure
NOTE
THE TOOL FOR INSTALLING THE STOP RINGS MUST BE
USED MANUALLY.
CAUTION
USING A HAMMER TO POSITION THE RINGS CAN DAM-
AGE THE LOCKING HOUSING.
Choosing the gasket
- Provisionally fit the piston into the cylinder, with-
out any base gasket.
- Assemble a dial gauge on the specific tool.
- Set the dial gauge to zero at a contrast plane with
an average preload, for example 5 mm. Keeping
the zero setting position, fit the tool on the cylinder
and lock it with 2 nuts, as shown in the figure.
- Rotate the crankshaft up to the TDC (the inver-
sion point of the dial gauge rotation)
SPORTCITY ONE 125 Engine
ENG - 91
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