Gilera 2008 MSS Nexus User Manual page 15

MSS Nexus 300 i.e. E3 ( 2008)
- Measure the diameter of the bearings on the pis-
ton.
Characteristic
Standard diameter
16 +0.006 +0.001 mm
- Calculate the piston pin coupling clearance.
N.B.
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
- Carefully clean the sealing ring housings.
- Measure the coupling clearance between the
sealing rings and the grooves using suitable sen-
sors, as shown in the diagram.
- If the clearance is greater than that indicated in
the table, replace the piston.
N.B.
MEASURE THE CLEARANCE BY INSERTING THE BLADE
OF THE FEELER THICKNESS GAUGE FROM THE SECOND
SEAL SIDE.
Fitting clearance
Top piston ring - standard coupling clearance
Top piston ring - maximum clear-
0.015 - 0.06 mm
ance allowed after use
ring - standard coupling clearance
Middle piston ring - maximum clearance al-
lowed after use
0.07 mm
ard coupling clearance
ring - maximum clearance allowed after use
0.07 mm
Middle piston
0.07 mm
0.015 - 0.06 mm
oil scraper ring - stand-
oil scraper
0.015 - 0.06 mm
Characteristics
CHAR - 15