Content .. 136 137 138 139 ..

Defender 90 / 110 / 130. Manual - part 138

ELECTRONIC IGNITION - ENGINE

Refitting Reluctor

ELECTRONIC IGNITION

with Lucas

Distributor

16. Slide reluctor as far as

will go on rotor shaft, then

rotate reluctor until it engages with the coupling
ring beneath the pick up base plate.

The distributor

shaft, coupling ring and reluctor are 'keyed' and
rotate together.

Pick Up Air Gap Adjustment

17.

The air gap between the pick up limb and reluctor
teeth must be set within the specified limits, using a
non-ferrous feeler gauge.

NOTE

When the original pick up and base plate

assembly  has  been  refitted  the  air gap should  not
normally  require  resetting  as  it  is  pre-set  at  the
factory.  When  renewing  the  assembly  the  air  gap
will  require adjusting to within  the

limits.

See technical data.

AMPLIFIER

Remove and Refit

Removing

The Lucas

distributor has

a conventional

unit and centrifugal automatic advance

mechanism.

A pick-up module,

in conjunction with a rotating

timing reluctor inside the distributor body, generates
timing signals. These are applied to an electronic

ignition amplifier module mounted

on the side of the

distributor body.

NOTE: The pick-up air gap is factory set. Do not adjust
the gap unless the pick-up

being changed or the base

plate has been moved. Use a non-ferrous feeler gauge to

set the air gap.

DISTRIBUTOR

Remove and refit

Removing

18. Disconnect the battery.
19.

Disconnect the electrical

from the amplifier

and

coil.

20. Remove t h e two retaining bolts with washers

securing the coil to the amplifier.

21. Remove the two bolts

to the

2. Disconnect vacuum

4. Disconnect

low

tension lead from coil.

5 .

Mark distributor body in relation to centre line of

valance.

rotor

arm

Refitting

22. Reverse the removal procedure, ensuring that all

electrical leads are correctly reconnected.

NOTE: The amplifier is not serviceable, in the event
of

a fault a new amplifier must be fitted.

Add alignment marks

distributor and front cover.

ELECTRICAL

NOTE: Marking distributor enables refitting in
exact original position, but if engine is turned while
distributor is removed, complete ignition timing
procedure must be followed.

7. Release the distributor clamp and remove the

distributor.

Refitting

NOTE:

If a new distributor is being fitted, mark body in

same relative position as distributor removed.

Leads for distributor cap should be connected as

illustrated.
Figures

1 to inclusive indicate plug lead numbers.

Right-hand side

of engine, when viewed

from the rear.
L H

Left-hand side of engine, when viewed from

the rear.

If engine has not been turned whilst distributor has

been removed, proceed as follows (items

10 to 17).

10. Fit new

ring seal to distributor housing.

11. Turn distributor drive until centre line of rotor arm

anti-clockwise

mark made on top edge

of distributor body.

Fit

distributor in accordance with alignment

markings.

NOTE: it may be necessary to align oil pump drive
shaft to enable distributor drive shaft to engage in
slot.

13. Fit clamp and bolt. Secure distributor in exact

orginal position.

14. Connect vacuum pipe to distributor and low

tension lead to coil.

15. Fit distributor cap.

16. Reconnect battery.

17.

Using suitable electronic equipment, set the
ignition timing, See IGNITION TIMING

Adjust.

18. If, with distributor removed, engine has been

turned it

be necessary to carry out the

following procedure.

19. Set engine

No. 1

piston to static ignition timing

figure (see data section) on compression stroke.

20. Turn distributor drive until

rotor arm is

approximately

30" anti-clockwise from number one

sparking plug lead position on cap.

21. Fit distributor to engine.
22. Check that centre line

of rotor arm is now in line

with number one sparking plug lead

on cap.

Reposition distributor

if necessary.

23. If distributor does not seat correctly

front cover,

oil pump drive is not engaged. Engage by lightly
pressing down distributor while turning engine.

24. Fit clamp and bolt leaving both loose at this stage.
25. Set the ignition timing statically to within

2"-3" of

T.D.C.

26. Connect the vacuum pipe to the distributor.
27.

Fit

low tension lead to coil.

28. Fit distributor cap.
29. Reconnect the battery.

30.

Using suitable electronic equipment set the ignition
timing, See IGNITION TIMING - Adjust.

DISTRIBUTOR-LUCAS

Overhaul

DISTRIBUTOR COVER

1. Unclip and remove the cover.

2. Renew the cover if known to be faulty.
3. Clean the cover and

brush with a nap free

cloth.

ROTOR ARM

Pull rotor arm from keyed shaft.

Renew rotor arm if known to be faulty.

INSULATION COVER (Flash shield)

6. Remove cover, secured by three screws.
7. Renew cover

if known to be faulty.

VACUUM UNIT

Remove  two  screws  from  vacuum  unit  securing
bracket,  disengage  vacuum  unit  connecting  rod
from  pick-up  base  plate  connecting  peg,  and

withdraw vacuum unit from distributor body.

ELECTRICAL

AMPLIFIER MODULE

9. Remove two screws and withdraw the module.

Remove the gasket.

11. Remove two screws securing the cast heatsink and

remove the heatsink.
WARNING: The amplifier contains Beryllia. Do

not open or crush.

PICK-UP AND BASE PLATE ASSEMBLY

12. Use circlip pliers to remove the circlip retaining the

13. Remove the flat washer and then the

ring

14. Gently withdraw the reluctor from the shaft, taking

reluctor on rotor shaft.

recessed in the top

of the reluctor.

care not to damage the teeth.

NOTE: Coupling ring fitted beneath reluctor.

Remove three support pillars and cable grommet.
Lift out the pick-up and base plate assembly.

NOTE:

Do not disturb the two barrel nuts securing

the pick-up module, otherwise the air gap will need
re-adjustment.

16. Renew pick-up and base plate assembly if module

is known to be faulty, otherwise check pick-up
winding resistance (2k-5k ohm).

RE-ASSEMBLY

17. This is mainly a reversal of the dismantling

procedure, noting the following points:

LUBRICATION

Apply clean engine oil:

drops to felt pad reservoir in rotor shaft.

FITTING PICK-UP AND BASE PLATE ASSEMBLY

18. Pick-up leads must be prevented from fouling the

rotating reluctor. Both leads

should

located

plastic carrier

as illustrated. Check during

assembly.

REFITTING

19.

reluctor

far as

will

go on rotor shaft, then

reluctor until it engages with the coupling

ring beneath t h e pick-up base plate. The
distributor shaft, coupling ring and reluctor

are

‘kcycd’ and rotate together. Fit the

ring,

flat

and retaining circlip.

PICK-UP

GAP ADJUSTMENT

The air gap between the pick-up limb and reluctor
teeth must be

within the

limits, using

non-ferrous

feeler

gauge.

is necessary, slacken the two barrel

nuts to set t h e air gap. See Engine Tuning Data.

Apply Chevron

(or equivalent) grease.

Auto advance mechanism.

c. Pick-up plate centre bearing.

Pre tilt spring and its rubbing area (pick-up and
base plate assy).
Vacuum unit connecting peg (pick-up and

plate assy) and

the connecting peg hole in vacuum unit connecting
rod.

NOTE: When the originai pick-up and base plate
assembly has been refitted the air gap should be

When renewing the assembly the air gap

will

require adjusting to within the specified limits.

ELECTRICAL

Service Parts

1. Cover

brush

spring

Rotor arm

cover

5 . Pick-up module and

asscmbly

6. Vacuum

unit

7. Amplifier module
8. 0 - r i n g
9

Gasket

Content .. 136 137 138 139 ..