5B
Chapter 5 Part B:
Ignition system
Carburettor models
System type
All except 1990 on, 1275 cc models . . . . . . . . . . . . . . . . . . . . . . . . . Conventional contact breaker ignition
1990 on, 1275 cc models . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lucas electronic ignition
Distributor - contact breaker ignition
Type:
All models except Cooper S Mk III:
Early type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lucas 25D4
Later type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lucas 45D4, 59D4 or Ducellier
Cooper S Mk III . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lucas 23D4
Direction of rotor arm rotation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Anti-clockwise
Contact breaker points gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.35 to 0.40 mm
Dwell angle:
Lucas 23D4 and 25D4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60º ± 3º
Lucas 45D4:
Non-sliding contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51º ± 5º
Sliding contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57º ± 5º
Lucas 59D4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54º ± 5º
Ducellier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57º ± 2º30’
Firing order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3-4-2 (No 1 cylinder next to radiator)
Ballasted ignition system (carburettor models) - identification . . . . . 2
Condenser - testing, removal and refitting . . . . . . . . . . . . . . . . . . . . 7
Contact breaker points - adjustment . . . . . . . . . . . . . . . . . . . . . . . . . 5
Contact breaker points - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Crankshaft sensor (fuel injection models) - removal and refitting . . . 11
Distributor - dismantling, inspection and reassembly . . . . . . . . . . . . 9
Distributor lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . .See Chapter 1
Distributor - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Ignition coil - removal, testing and refitting . . . . . . . . . . . . . . . . . . . . 10
Ignition system check . . . . . . . . . . . . . . . . . . . . . . . . . . .See Chapter 1
Ignition system (carburettor models) - testing . . . . . . . . . . . . . . . . . . 3
Ignition system (fuel injection models) - testing . . . . . . . . . . . . . . . . 4
Ignition timing - checking and adjustment . . . . . . . . . . . . . . . . . . . . 13
Reluctor ring (fuel injection models) - removal and refitting . . . . . . . 12
Spark plug renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . .See Chapter 1
Transmission-controlled ignition advance system (carburettor models)
- checking and component renewal . . . . . . . . . . . . . . . . . . . . . . . 14
5B•1
Specifications
Contents
Easy, suitable for
novice with little
experience
Fairly easy, suitable
for beginner with
some experience
Fairly difficult,
suitable for competent
DIY mechanic
Difficult, suitable for
experienced DIY
mechanic
Very difficult,
suitable for expert DIY
or professional
Degrees of difficulty
5
4
3
2
1
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