Daewoo G424 Gasoline, Service Manual

Page: 53 / 199

G424 Service Manual Ignition System 52
Governor advance mechanism
In the figure below, pin A rotates together with the
shaft. A governor weight is installed to this pin A.
There is a pin B on the governor weight which fits into
the oblong hole in the cam base. The governor spring
is attached to the spring hook of the governor weight,
pulling the governor weight to the fully closed position.
When the rotation speed increases, the governor
weight is subjected to centrifugal force which causes it
to open outward. When the centrifugal force becomes
stronger than the tensile force of the spring, the weight
opens, as shown by (b) in the figure below, thus
maintaining a balance with the force of the spring.
Because pin B of the weight is fit into the oblong hole In the cam base, the movement of pin B becomes
rotation of the cam in the direction of rotation. In other
words, the cam advances in relation to the shaft.
When the rotation speed becomes sufficiently high,
pin B contacts the outer side of the oblong hole in the
cam base, and the weight opens no further. This
position is the fully advanced condition.
When the rotation speed decreases, the centrifugal
force of the weight becomes weaker and the weight is
closed by the force of the spring, thus returning to the
original condition.
The advance characteristic of the centrifugal-advance device
employed by the governor is as shown in the figure at the left.
Point A is the beginning of advance, and point B shows the
rotation speed at full advance.