APRILIA Atlantic 300 Service Station Manual page 19

ATLANTIC 300 i.e.
Specification
Piston diameter
Cylinder diameter
Name
cylinder - piston
cylinder - piston
cylinder - piston
cylinder - piston
NOTE
THE PISTON MUST BE FITTED WITH THE ARROW FACING TOWARDS THE EXHAUST SIDE, THE
PISTON RINGS MUST BE FITTED WITH THE REFERENCE «TOP» OR THE STAMPED MARK
FACING UPWARDS.
- Check the pin outside diameter
Characteristic
Pin outside diameter
16 +0 -0.004 mm
- Measure the diameter of the bearings on the pis-
ton.
Characteristic
Standard diameter
16 +0.006 +0.001 mm
- Calculate the pin - piston coupling clearance.
NOTE
THE PIN HOUSINGS HAVE TWO LUBRICATION CHANNELS FOR THIS REASON MEASURE THE
DIAMETER ACCORDING TO THE PISTON AXIS
Characteristic
Standard clearance:
0.001 ÷ 0.010 mm
CYLINDER - PISTON
COUPLING CATEGORIES
Initials Cylinder
M 75.01 ÷ 75.017
N 75.017 ÷ 75.024
O 75.024 ÷ 75.031
P 75.031 ÷ 75.038
Characteristics
Desc./Quantity
74.967 +0.014 -0.014 mm
75 +0.038 +0.01 mm
Piston Play on fitting
74.953 ÷ 74.960 0.050 ÷ 0.064
74.960 ÷ 74.967 0.050 ÷ 0.064
74.967 ÷ 74.974 0.050 ÷ 0.064
74.974 ÷ 74.981 0.050 ÷ 0.064
CHAR - 19