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Nexus 500
+ 0.10 ÷ + 0.185
Gasket thickness 3
0.8 ± 0.05
Refitting the piston rings
- Place the scraper ring spring on the piston.
- Install the scraper ring keeping the opening op-
posed to the spring junction and with the writing
"top" facing the piston top. The chamfered side of
the oil scraper ring should always be facing the
piston crown.
- Fit the second lining with the identification letter
or the writing "top" facing the piston crown. In any
case, the step must be facing opposite the piston
top.
- Install the first compression lining in the direction
imposed by the housing.
- It is advisable to use a fitter to facilitate the in-
stallation of the linings.
N.B.
THE TWO PISTON RINGS ARE MADE WITH A TAPERED
CYLINDRICAL CONTACT CROSS-SECTION. THIS IS TO
ACHIEVE A BETTER BEDDING.
- Misalign the lining openings at 120° as shown in the figure.
- Lubricate the components with engine oil.
- The engine uses the first compression lining with an L section.
Refitting the cylinder
- Insert the cylinder base gasket with the thickness
determined above.
- Using the fork and the ring clamp, fit the cylinder
as shown in the figure.
N.B.
BEFORE FITTING THE CYLINDER, CAREFULLY BLOW
THE LUBRICATION DUCT AND LUBRICATE THE CYLIN-
DER LINER. CHECK THE PRESENCE OF THE TWO REF-
ERENCE DOWELS.
Specific tooling
020468Y Piston fitting band
020512Y Piston fitting fork
Engine
ENG - 139
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