Gilera 633721 Workshop Manual page 139

Nexus 500 euro 3
Removing the cylinder - piston assy.
- Remove the timing chain.
- Loosen the fastening screw and remove the
spacer and the tightening sliding block.
N.B.
IT IS ADVISABLE TO MARK THE CHAIN IN ORDER TO EN-
SURE THAT THE INITIAL DIRECTION OF ROTATION IS
MAINTAINED.
- Extract the cylinder with the relevant gasket and
the centring dowel.
N.B.
THE SECOND CENTRING IS ENSURED BY A PIN SET INTO
THE CYLINDER.
CAUTION
TO PREVENT DAMAGES TO THE PISTON, SUPPORT IT
WHILE REMOVING THE CYLINDER.
- Remove the 2 piston pin locking rings by the spe-
cific housings.
- Extract the pin and remove the piston.
N.B.
USE PAPER OR A CLOTH TO CLOSE THE CYLINDER
HOUSING MOUTH ON THE CRANKCASE TO PREVENT
SLIPPAGE OF ONE OF THE PIN LOCKING RINGS INTO
THE CASE.
- Remove the piston sealing rings and the oil scra-
per.
CAUTION
NOTE THE ASSEMBLY POSITIONS OF THE LININGS TO
PREVENT INVERTING THE POSITION IN CASE OF REUSE.
N.B.
BE CAREFUL NOT TO DAMAGE THE SEALING RINGS
DURING REMOVAL.
Engine
ENG - 139