Fit the piston rings in the cylinder bore and check that the open-
ing between the ends is within the recommended values; if this is
not the case, replace the cir-clips.
Cylinder compression piston ring gap
I piston ring gap 0.20 ÷ 0.35 mm
II piston ring gap 0.60 ÷ 0.80 mm
Scraper ring gap 0.25 ÷ 0.50 mm
Check that the outer diameter of the pistons corresponds to the
recommended gures; if not, replace the piston complete with
piston rings and gudgeon pin.
Piston outer diameter
Grade A 81.920 ÷ 81.930 mm
Grade B 81.930 ÷ 81.940 mm
Grade C 81.940 ÷ 81.950 mm
Measure perpendicular to the gudgeon pin axis, 9 mm from
the lower edge of the skirt.
Check that backlash (1 a) between rings (1b) and the seats in
pistons(1c) corresponds to the recommended gures.
Cylinder compression piston ring
I piston ring 0.105 ÷ 0.150 mm
II piston ring 0.050 ÷ 0.090 mm
Scraper ring 0.030 ÷ 0.070 mm
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