Introduction; Removal - Triumph Rocket III Classic Service Manual

Introduction
In an engine with an even number of cylinders (Le. 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 "I, 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 effect 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 (see page
10-2).
2. Separate the crankcase halves (see page 5-5>.
3. With the crankcase halves separated, lift out the
balancer shaft complete with the bearings.
cbrt
1. Balancer
2. Crankshaft
Balancer
4. If necessary, slide off the ball bearing at the end
opposite to the drive gear.
cbrg
1.
Balancer
2. Bearing
Note:
•
The bearing at the gear end can only be
removed in a press.
SelVice Manual - Rocket Ill/ Classic / Touring
7.3