If, however, the cylinder should be increased, the size "E" (see figure) must exceed the size "C" of the
piston to be installed (marked on the piston itself) of the indicated value, "Cylinder clearance - pis-
ton".
Fitting clearance
Cylinder - piston clearance 0.24
CAUTION
AT REPLACEMENT OF PISTON IN THE CYLINDER, MAKE SURE THAT THE ARROW STAMPED
ON THE PISTON SPROCKET IS FACING THE EXHAUST PORT OF THE CYLINDER.
Piston ring oversizes
SEALING RINGS
Specification Desc./Quantity
Seal ring (Nominal sizes) Diameter = 68 (mm)
CLEARANCE "A" UPON FITTING
Name
Description Dimensions Initials Quantity
Sealing ring 1st Oversize 68.20 0.25 to 0.40
Sealing ring 2nd Oversize 68.40 0.25 to 0.40
Sealing ring 3rd Oversize 68.60 0.25 to 0.40
Crankshaft alignment check
With the proper equipment (1), check that the ec-
centricity of the surface of Ø "E" and "F" are con-
tained within 0.03 mm. (the maximum reading limit
on the dial gauge clock); also check the eccentric-
ity of the diameter "D", for which there shall be a
maximum reading of 0.02 mm.
In the case of eccentricities not much greater than
that prescribed, perform the straightening of the
shaft by means of counterweights with a wedge,
or tightening it in a vice (equipped with aluminium
bushings) as needed.
APE TM Benzina Characteristics
CH - 21
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