Land Rover Defender 90 110 Workshop Book 5 Rover

ELECTRONIC IGNITION - V8 ENGINE 186 I 
ELECTRONIC  IGNITION - WITH 35DMS \.I I. .. e, ’ DISTRIBUTOR 
The Lucas model 35DM8 distributor  has a conventional 
advancehetard vacuum 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  unit  fitted under  the  ignition coil 
mounted 
on top of the  left  front  wing...

1861 ELECTRONIC IGNITION - V8 ENGINE 
DISTRIBUTOR - ELECTRONIC IGNITION - 
V8 ENGINES 35DM8 
Remove and refit 
Removing 
1. Disconnect  battery. 
2.  Disconnect  vacuum 
pipe(s). 
3. Remove  distributor  cap. 
4. Disconnect  low tension lead from  coil. 
5. Mark distributor  body in relation to centre  line of 
rotor arm. 
6. Add  alignment  marks to distributor  and  front 
cover. 
NOTE:  Marking  distributor  enables refitting  in 
exact  original  position,  but if engine 
is turned  while...

ELECTRONIC IGNITION - V8 ENGINE 186 I 
1. It is essential that the following  procedures  are 
adhcrcd  to.  Inaccurate  timing  can lead to 
scrious 
engine  damage  and additionally  create failurc to 
comply with the emission  regulations  applying to 
the  country  of destination.  If the  engine  is being 
checkcd in  the  vehicle  and is fitted  with an air 
conditioning  unit the compressor  must be isolated. 
2. On initial  engine  build, or if the distributor  has 
been  disturbed  for  any...

lzi ELECTRONIC IGNITION - FAULT DIAGNOSIS 
TEST 2: Test 2 
Amplifier Static Checks 
Switch  the ignition ‘ON’ 
(a)  Connect  voltmeter to points  in the circuit  indicated 
by  the  arrow heads and make  a note  of the  voltage 
readings. 
NOTE: Only  move  the voltmeter  positive lead during 
tests  2,3 and 
4. 
(b) Compare voltages obtained  with the specified 
EXPECTED  READINGS 
1 More than 11.5 volts 
2 1 volt max  below  volts at point 1 in test  circuit 
3 1 volt  max below volts  at point 1 in...

ELECTRONIC IGNITION - FAULT DIAGNOSIS 186 
L 
.,. . ..- ., TEST5: TEST 7: i ::. . \..;;:::;*Y . ,, , ,. ,. . .... .. ..-. 
Check HT Sparking Visual 
and HT Cable Checks 
.. .;,7.. ; .. . ... .,. I. , .. .  . , , .. .. . .... . .. . 
Remove  existing coil/distributor HT lead and fit test 
HT  lead 
to coil  chimney.  Hold free end about 6 mm 
(0.25 in) from  the engine  block and crank  the engine. 
HT  sparking  good, repeat  test  with  original 
HT lead, if 
then  no  sparking, change HT lead. If...

I86 I ELECTRONIC IGNITION - V8 ENGINE 
OVERHAUL DISTRIBUTOR - LUCAS 35DM8 
Distributor Cap 
1. Unclip and remove  cap. 
2. Renew cap if known to be  faulty. 
3. Clean  with a nap-free  cloth. 
Rotor  Arm 
4. Pull rotor  arm from  keyed  shaft. 
5. Renew  rotor arm if known  to be  faulty. 
Insulation Cover  (Flash shield) 
6. Remove cover, secured  by 3 screws. 
7. Renew cover if known to be  faulty. 
Vacuum  Unit 
8. Remove  2 screws  from vacuum  unit securing 
bracket, 
discngage vacuum  unit...

ELECTRONIC IGNITION - V8 ENGINE I86 I 
,. * . ,. - Refitting Reluctor  ELECTRONIC  IGNITION - with Lucas 35DLMS 
Distributor * e.- 1 
16. Slide reluctor  as far as it 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...

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. 
8. Leads for distributor  cap should  be connected  as 
illustrated. 
Figures 
1 to 8 inclusive  indicate...

ELECTRICAL 
AMPLIFIER  MODULE 
86 
9. Remove two screws  and withdraw  the module. 
10. 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 ‘0’ ring 
14. Gently  withdraw  the reluctor  from the shaft,  taking 
reluctor 
on rotor shaft....

ELECTRICAL 
1 
Y .% I .L- I Y Service Parts 
1. Cover 
2. HT brush & spring 
3. Rotor arm 
4. Insul cover 
5. Pick-up module and base platc asscmbly 
6. Vacuum unit 
7. Amplifier module 
8. 0-ring oil scal 
9 Gasket 
16 
W 
RRl866 E U