- Calculate the difference between the two meas-
urements.
- By means of the table, see the SPECIFICA-
TIONS chapter, identify the cylinder base gasket
thickness to be used upon refitting. Correctly iden-
tify the cylinder base gasket thickness to keep the
correct compression ratio.
- Remove the special tool and the cylinder.
Specific tooling
020428Y Support to check piston position
Refitting the piston rings
- Place the oil scraper spring on the piston.
- Refit the oil scraper ring with the join of spring
ends on the opposite side from the ring gap and
the word 'TOP' towards the crown of the piston.
The tapered side of the middle piston ring should
always be facing away from the crown of the pis-
ton.
- Fit the middle piston ring with the identification
letter facing the crown of the piston. In any case,
the step must be facing opposite the piston top.
- Fit the top piston ring with the word 'top' or the
reference mark facing the crown of the piston.
- Offset the piston ring gaps on the three rings by
120° to each other as shown in the figure.
- Lubricate the components with engine oil.
NOTE
SO AS TO OBTAIN THE BEST CONFIGURATION THE 2
SEALING RINGS ARE MADE WITH A CONTACT CONICAL
CYLINDER SECTION.
Engine SPORTCITY ONE 125
ENG - 92
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