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The Series
Land Rover Ignition System - Fault Diagnosis
Often the greatest cause of problems
a Series I, II or III Land Rover has in starting is damp in
the ignition system. A Land Rover tends to be parked outdoors
overnight and condensation on ignition components gives problems
in the morning.
Outline of the
ignition system operation in a Series Land Rover.
Low tension circuit (blue)-
Electric current from the Land Rover battery passes to the ignition
switch then onto the ignition coil. The current passes around
the coil and then moves to the contact breaker points.Whenever
the points are closed the current passes back to the battery
through the engine and chassis.
High tension circuit (red)-
At the moment the contact points open the current stops flowing
and this causes a high voltage current to pass from the centre
of the coil to the centre of the distributor cap and then via
the rotor arm to one of the spark plugs. This current jumps
the spark plug gap at exactly the moment the fuel/air mixture
in the cylinder is compressed and ready to ignite.
Engine fails to turn over sufficiently
or not at all.
A Series I, II and III Land Rover generally has an
engine starter handle, which can be used to turn over the Land
Rover engine in the event of battery discharge. The ignition
system must be in good condition for this to be effective however.
Check for: discharged battery; loose or corroded
battery terminal; loose or corroded earth lead connection to
chassis; loose or corroded connection at starter motor; worn
starter motor brushes; worn starter motor or solenoid; seized
engine.
The Land Rover Engine
fails to start
Electrical connections on a Series
Land Rover are basic in design andusually located where they
are subject to exposure to water and dirt. This is often the
cause of your Series 1,2 or 3 not starting.
Also check for: damp distributor
leads or spark plug leads; condensation inside distributor cap;
cracked distributor cap; faulty rotor arm; carbon brush in the
top of the distributor cap not touching the rotor arm; dirty
contact points; faulty condenser; faulty ignition coil; faulty
lead from coil to distributor;
Engine misfires
Spark plug leads replaced in the wrong order (correct firing
order 1342 - plug 1 nearest radiator); faulty or loose spark
plug or spark plug lead; incorrectly set ignition timing; faulty
coil; damaged wire or loose connection; condenser short circuit;
mechanical failure in the distributor.
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