VESPA 946 E4 EMEA 2021 Manual page 180

Engine
Inspecting the crankshaft plain bearings
- To obtain a good bushing lubrication it is neces-
sary to have both an optimal lubricating pressure
(3.2 bar) and a good oil flow rate; the bushings
must be correctly positioned so as not to obstruct
the oil supply channels.
- The main bushings are comprised of two half-
bearings, one with holes and channels for lubrica-
tion whereas the other is solid.
Characteristic
«A»
AXIS CYLINDER
- The oil feeding channel section is also affected by the bushings driving depth compared with the
crankshaft axial clearance of the limiting surface.
N.B.
TO MEASURE WEAR LIMITS AND COUPLING CLEARANCES, SEE THE SPECIFICATIONS CHAP-
TER.
See also
Crankcase - crankshaft - connecting rod
Coupling chart
N.B.
TO MEASURE WEAR LIMITS AND COUPLING CLEARANCES, SEE THE SPECIFICATIONS CHAP-
TER.
See also
Crankcase - crankshaft - connecting rod
Refitting the crankcase halves
- Follow the removal steps but in reverse order; be
careful to respect the prescribed tightening tor-
ques.
- Insert the by-pass.
- Insert a new gasket and be careful with the align-
ment dowels.
- Maintaining the crankshaft inserted in the fly-
wheel side crankcase, couple the crankcase
halves.
- Insert the screws and tighten to specified torque.
ENG - 180
Vespa 946 E4-E5 EMEA-USA-ASIA (2021-)