
55
ASSEMBLY
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Fit the piston ring into the cylinder and use a feeler
gauge to measure the gap between the two ends of
the ring. When inserting the ring into the bore, use
the top of the piston to ensure that the ring is sitting
parallel to its working plane, and position it approxi-
mately 10mm from the top surface of the cylinder.
Maximum gap, compression rings: 0.8mm
Maximum gap, oil scraper ring: 1.0mm
Replace the rings if the values for the gaps exceed
those listed.
If the gap exceeds the limit value even when using a
new piston ring, the cylinder must be replaced.
Clean the grooves for the compression rings and for
the oil scraper ring of carbon residues from com-
bustion.
Use a feeler gauge to measure the play between
the compression rings and the ring grooves in the
piston. If these values exceed the maximum, with
piston ring thicknesses within the prescribed limits,
the piston must be replaced.
Maximum play: 0.12mm
Measure the diameter of the piston pin and, if this
value is below the limit, replace the piston pin.
Piston pin minimum diameter: 15.995mm
Replace the piston pin also if you detect excessive
scoring or discolouration of the surface in contact
with the connecting rod small end bush.
Measure the diameter of the hole in the piston for
housing the piston pin. If the play between the pis-
ton pin and its housing exceeds the limit, with the
piston pin diameter within the prescribed limits,
change the piston.
limit of play 0.04mm
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