Introduction; Removal - Triumph Rocket III Service Manual

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