Engine Coupling Categories - APRILIA SR MAX 125 ie Service Station Manual

Characteristics
Name
Cylinder
Cylinder
Piston
Piston
Cylinder 1st Oversize
Cylinder 1st Oversize
Piston 1st Oversize
Piston 1st Oversize
Cylinder 2nd Oversize
Cylinder 2nd Oversize
Piston 2nd Oversize
Piston 2nd Oversize
Cylinder 3rd Oversize
Cylinder 3rd Oversize
Piston 3rd Oversize
Piston 3rd Oversize
NOTE
THE PISTON MUST BE INSTALLED WITH THE ARROW FACING TOWARDS THE EXHAUST SIDE,
THE PISTON RINGS MUST BE INSTALLED WITH THE WORD «TOP» OR THE STAMPED MARK
FACING UPWARDS.
- Calculate the coupling clearance between pin
and connecting rod small end.
Characteristic
Standard diameter:
Ø 14.996 - 15.0 mm
Standard clearance:
0.015 - 0.029 mm
- Measure the diameter of the bearings on the pis-
ton.
Characteristic
Standard diameter:
15 +0.006 + 0.001mm
- Calculate the piston pin coupling clearance.
NOTE
THE PIN HOUSINGS HAVE 2 LUBRICATION CHANNELS. FOR THIS REASON, MEASUREMENT
MUST BE MADE ACCORDING TO THE PISTON AXIS.
Characteristic
Standard clearance:
0.001 - 0.010 mm
CHAR - 12

ENGINE COUPLING CATEGORIES

Initials Cylinder
A 56.997 to 57.004
B 57.004 to 57.011
C 57.011 to 57.018
D 57.018 to 57.025
A1 57.197 to 57.204
B 1 57.204 to 57.211
C 1 57.211 to 57.218
D 1 57.218 to 57.225
A2 57.397 to 57.404
B 2 57.404 to 57.411
C 2 57.411 to 57.418
D 2 57.418 to 57.425
A 3 57.597 to 57.604
B 3 57.604 to 57.611
C 3 57.611 to 57.618
D 3 57.618 to 57.625
SR MAX 125 ie
Piston Play on fitting
56.945 - 56.952 0.045 - 0.059
56.952 - 56.959 0.045 - 0.059
56.959 - 56.966 0.045 - 0.059
56.966 - 56.973 0.045 - 0.059
57.145 - 57.152 0.045 - 0.059
57.152 - 57.159 0.045 - 0.059
57.159 - 57.166 0.045 - 0.059
57.166 - 57.173 0.045 - 0.059
57.345 - 57.352 0.045 - 0.059
57.352 - 57.359 0.045 - 0.059
57.359 - 57.366 0.045 - 0.059
57.366 - 57.373 0.045 - 0.059
57.545 - 57.552 0.045 - 0.059
57.552 - 57.559 0.045 - 0.059
57.559 - 57.566 0.045 - 0.059
57.566 - 57.573 0.045 - 0.059