Page 246 - Mechanic Diesel - TT
P. 246
MECHANIC DIESEL - CITS
damaged. In the condenser, two leaves made of tin or aluminum are wrapped in layers, between which wax paper
is applied as insulation. These leaves are kept closed in a case.
When C.B. Points rotation opens to break the circuit, in that case C.B. Spark is generated in the points, due to
which C.B. The points start burning and the formation of high tension current is hindered. In case of high tension
current flowing in a low tension circuit, condensers store maximum current inside them. The condenser and its
structure are shown in the figure. It consists of lead or aluminum coils, which are separated from each other. One
end of the coil is connected to the condenser terminal and the other end is connected to the condenser case.
5 Ignition Switch Ignition Switch
The ignition switch is fitted on the panel board between the battery and the ignition coil. It connects and separates
the primary circuit from the battery.
6 Contact Breaker
To generate high voltage in the secondary winding of the coil, the contact breaker connects and disconnects the
primary circuit at certain time intervals. There are two number of contact breaker points, one of which is directly
fitted on the base plate and the other is insulated and operated by a rotating arm.
2 Magneto ignition system
Magneto ignition system has its own current generating device, therefore battery is not required.
The arrangement of the magneto ignition system for four cylinder S.I. Engine is shown in figure.
Essential components of the system
1 Electrical generator
An electrical generator with permanent field magnets and rotating armature which produces an alternating
current.
2 Induction coil
An induction coil with primary and secondary windings being wound on the armature.
3 Contact breaker
A contact breaker to interrupt the generator primary circuit and the condenser.
4 Distributor
A distributor to distribute high tension current to spark plugs.
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CITS : Automotive - Mechanic Diesel - Lesson 71 - 75
