Technical data

108
- Using appropriate feeler gauges, measure the clearance
between piston rings and grooves, as shown in the figure.
- If such clearances exceed the limits given in the table be-
low, replace the piston.
N.B.
THE HOUSINGS OF THE PIN HAVE TWO LUBRICATION CHAN-
NELS. FOR THIS REASON MEASUREMENT OF THE DIAMETER
MUST BE CARRIED OUT ACCORDING TO THE AXIS OF THE
PISTON.
Characteristic
Diameter of pin seat on piston : Standard diameter
15,001 -15,006mm
Diameter of pin seat on piston : Standard clearance
0,001 -0,010mm
Piston pin diameter: Piston 125
56,945 - 56,973 mm
Fitting clearance
1° segment - connection game standard
0,025 ÷ 0,07 mm
1° segment - the admitted maximum game after the use
0,08 mm
2nd lining - Standard coupling clearance
0,015 ÷ 0,06 mm 2° aro
2nd lining - Admissible clearance after use
0,07 mm rascador de aceite
Standard coupling clearance
0,015 ÷ 0,06 mm rascador de
Admissible clearance after use
0,07 mm
Version 250
- Measure the diameter from the pin seat on the piston.
- Calculate the piston pin coupling clearance.
- Measure the external diameter of the piston according to a
direction at a right angle to the pin’s axis.