Inspecting The Driven Sliding Half-Pulley; Refitting The Driven Half-Pulley Bearing - PIAGGIO MSS Fly 50 4T Workshop Manual

Engine

Inspecting the driven sliding half-pulley

- Remove the 2 inner sealing rings and the two O-
rings.
- Measure the inside diameter of the mobile half-
pulley bushing.
Characteristic
Mobile driven half-pulley/ Maximum diameter
allowed
Ø 34.08 mm
- Check the belt contact surfaces.
- Insert the new oil seal and O-rings on the mobile
half-pulley.
- Fitting the half-pulley on the bushing.
Recommended products
AGIP GREASE SM 2 Grease for the tone wheel
revolving ring
Soap-based lithium grease containing NLGI 2 Mo-
lybdenum disulphide; ISO-L-XBCHB2, DIN
KF2K-20
- Make sure the pins and collar are not worn, reassemble the pins and collar.
- Use a greaser with a curved spout to lubricate the driven pulley unit with around 6 g of grease. This
operation must be done through one of the holes inside the bushing until grease comes out of the
opposite hole. This procedure is necessary to prevent the presence of grease beyond the O-ring.
Recommended products
AGIP GREASE SM 2 Grease for the tone wheel revolving ring
Soap-based lithium grease containing NLGI 2 Molybdenum disulphide; ISO-L-XBCHB2, DIN KF2K-20

Refitting the driven half-pulley bearing

- Fit a new ball bearing with the specific tool.
- Fit the ball bearing retention snap ring.
- Fit the new roller bearing with the wording visible
from the outside.
CAUTION
PROPERLY SUPPORT THE HALF-PULLEY TO PREVENT
DAMAGE TO THE THREADED END WHILE THE BEARINGS
ARE BEING FITTED.
Specific tooling
020376Y Adaptor handle
ENG - 68
MSS Fly 50 4T