M:01:04
Electrical System and Instruments
Connect the ohm meter between one of the
terminals in the connector and distributor body.
Meter should show open circuit. Resistance shows
there is a fault.
PROVING THE EXISTENCE OF A FAULT
IN THE DISTRIBUTOR
Disconnect the distributor connector and insert
two wires from a T.D.C. pick up into the sockets in
the connector on the electronic unit side.
Take a magnet and move it smartly towards and
away from the T.D.C. pick up. Should a spark
lump the gap between the ignition coil and H.T.
lead the distributor must be changed or replaced.
If the ignition is faulty when the engine is running:
It is
adviseable to change the electronic unit when
misfiring or jerky operation occurs, only after first
checking the following:
• Spark Plugs
• H.T: Leads
• Position Plug Leads
• Distributor
• Ignition Coil
Checking the Curves on the Oscilloscope:
The control voltage curve cannot be checked on
the oscilloscope and this voltage cannot be altered.
Only the H.T. curve can be checked in the same
way as for a conventional distributor.
The dwell angle cannot be read neither can it be
adjusted.
SPECIFICATIONS
Distributor
Rotation : Clockwise
Firing Order :
1-6-3-5-2-4
Resistor Value
Ignition Timing
Centrifugal Advance
Vacuum Advance
Induction Coil Resistance
Trigger/Stator air gap
Coil
Primary Winding Resistance
0.5 ohm each
(1.0 ohm total)
13° ± 2°
B.T.D.C.
at 775 ± 50
rpm
1000 rpm = 0°
2000 rpm = 10°
3000 rpm = 14°
4000 rpm = 20°
5 in HG = 3°
10 in HG = 12°
15 in HG = 20°
895 - 1,275 ohm
0.25 mm
(use non magnetic
feeler gauge)
0.95 - 1.4 ohm
at
20°C
Secondary Winding Resistance : 5.5 — 8.5
kohms
Average Current Value Through
3.2 amps
Primary Winding at idle
Spark Plugs
Spark Plug Gap
Spark Plug Tightening Torque
Bosch HR6 DS
0.6 mm to
0.7 mm (.024 to
.028)
17 - 20
Nm
(13
to
15
ft./lb.)
Precautions
• Never disconnect an H.T. wire with engine
running.
• Any H.T. wire disconnected for checking
purposes must be earthed before the engine is
started.
• When the engine is running dangerously
high,
voltages which may prove fatal are present in
this circuit.
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