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 band clamp, install the
cylinder as shown in the figure.
N.B.
BEFORE INSTALLING THE CYLINDER, CARE-
FULLY BLOW THE LUBRICATION DUCT AND
LUBRICATE THE CYLINDER LINER. CHECK
THE PRESENCE OF THE TWO REFERENCE
DOWELS.
Specific tooling
020468Y Piston fitting band
020512Y Piston fitting fork
Inspecting the cylinder head
- Using a trued bar and feeler gauge check that the cylinder head surface is not worn or distorted.
Fuoco 500 i.e. Engine
ENG - 61
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