Balancer
Introduction
In
an
engine with
an
even
number
of
cylinders
(i.e.
2,
4, 6 etc.), a piston
on
an
upward stroke
is
always
counter-balanced
by
one
on
a descending stroke.
However,
in
an
engine
with
an
odd
number
of
cylinders,
such
as that fitted to the Rocket Ill, this
natural state
of
balance does not
occur.
Therefore a
balancer
is
fitted
to
the engine in order to control
irregular pulses caused
by
the odd number
of
cylinders. Without a balancer,
the
engine would 'pulse'
each
time the crankshaft rotated. This 'pulsing' would
be
felt
as
a vibration which would amplify
as
engine
speed increases.
The balancer has
the
ellect
of
a pair
of
counterbalance weights, which create
an
equal
amount
of
energy
in
the opposite direction,
and
at
the
same time
as
that produced
by
the crankshaft, pistons
and
connecting
rods.
Because the opposing pulses
occur at the same point
of
crankshaft rotation,
and
are
of
an
equal magnitude, a state
of
equilibrium or
balance
is
reached.
Removal
Before starting work, ensure the motorcycle
is
stabilised and adequately supported. This will help
prevent
it
from falling and causing injury to
the
operator or damage
to
the motorcycle.
1. Remove the engine as described
on
page 10.2.
2. Separate
the
crankcase halves
as
described
on
page 5.5.
3. With the crankcase halves separated, lift out the
balancer shaft complete
with
the bearings.
1.
Balancer
2.
Crankshaft
4.
If
necessary, slide oil the ball bearing at the
end
opposite
to
the drive
gear.
1.
Balancer
2.
Bearing
Note:
• The bearing at the gear end can only be
removed in a press.
Service Manual - Rocket
III
7.3
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