Land Rover Defender 90 110 Workshop Book 5 Rover

ELECTRICAL 1861 
r..z:.. ,... .._. . . . .,.. . . . .. .. ,, ,.... AMPLIFIER MODULE 
22. Before fitting the module,  apply MS4 Silicone 
grease or equivalent  heat - conducting  compound 
to  the  amplifier  module backplate,  the seating face 
on  distributor  body and both  faces 
of the heatsink 
casting. 
?U,. v.: I ., ..  ~ 
IGNITION TIMING 
Adjust 
1. It 
is essential  that thc following  procedures  are 
adhered  to. Inaccurate  timing  can  lead to serious 
engine  damage  and  additionally...

186 I ELECTRICAL 
1 2 3 4 
L V d V 
TEST 2: 
SUSPECT 
Discharged  battery 
TEST 3: 
V V L V 
% V H 
L. T. Voltage 
Coil or amplifier 
Amplificrearth 
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. 
(b)  Compare 
voltages obtained  with the specified 
values  listed below: 
EXPECTED READINGS 
V1. More  than 11.5 volts 
V2. 
1 volt max below  volts at point  1 in test circuit 
V3. 
1 volt max...

ELECTRICAL 186 I 
Coil H1 Sparking 
Remove existing coil/distributor HT lcad and fit test 
HT lead to coil  tower.  Using suitable  insulated  pliers, 
hold  free  end  about 
6 mm (0.25 in) from  the  engine 
block  and crank 
the engine. There should  be a good FIT 
spark. 
If weak or no sparking, fit new coil,  rcpeat test. 
HT sparking good, repeat  test with  original  HT lead. If 
sparking  is good,  carry out Test 6. 
If weak or no sparking, fit new  HT lead, if engine will 
not start carry  out...

86 
ALTERNATOR OVERHAUL - Lucas A115-3 and 
A115-45 
ELECTRICAL EQUIPMENT- ALTERNATOR 
DISMANTLE 
1. Remove the alternator  from the engine. 
2. Remove  the  cover  retaining  screws and lift off the 
cover. 
Removing  the surge  protection  diode 
3. Withdraw  the screw  securing  the  diode to the slip 
4. Disconnect  the lead  from  the rectifier  assembly  and 
ring 
end bracket. 
remove 
the diode. 
Removing  the regulator (Note  arrangement  of the 
brush  box  connections) 
5. Disconnect  the...

ELECTRICAL EQUIPMENT - ALTERNATOR 
ST 1280M 
86 
10 
I 9 
1. Cover 
2. Regulator 
3. Rectifier 
4. Drive-end bracket 
5. End bearing kit 
6. Rotor assembly 
7. Slip ring  end bearing 
8. Slip rings 
6 7 
14 
KEY TO ALTERNATOR 
9. Slip  ring end bracket 
10. Stator 
11. Brush box 
12. Brushset 
13. Fixing bolt -slip ring  end bracket  to drive-end bracket 
14.  Suppression capacitor 
15. Surge  protection  diode 
21  

I86 I ELECTRICAL EQUIPMENT - ALTERNATOR 
19 
/ 
11ov - 
I 12 I 
ST1283M 
20. Check for satisfactory  field winding  insulation  by 
connecting  a 110 
V A.C.  15-watt test lamp betwcen 
either of the slip  rings  and the rotor  body.  The 
lamp  should  not light. 
ST1284M 
Stator winding 
21. Due  to the  very  low resistance  of the  stator 
windings,  a practical  test 
to determine  the presence 
of  short
-circuited  turns cannot  be carried  out 
without  the 
usc of special  instruments.  However,...

ELECTRICAL EQUIPMENT- ALTERNATOR 
ST1286M 
TIGHTENING TORQUES 
Through bolts ..................................................... 
Rectifier fixing bolts ............................................. 
SRE Cover ...................................................... 
Brush  Box ....................................................... 
Surge Diode .................................................... 
Brush  and Regulator  fixing ................................. 
D/E Bearing Plate...

86 
ALTERNATOR OVERHAUL - Lucas A12745 
ELECTRICAL EQUIPMENT- ALTERNATOR 
Description 
The model A127 alternator is a three  phase,  field 
sensed  unit, the rotor  and stator  windings  generate 
three  phase  alternating  current (AC) which  is rectified 
to  direct  current 
(DC). The electronic  voltage regulator 
unit  controls  the alternator  output voltage  by high 
frequency  switching 
of the rotor  field circuit. 
It 
is essential  that good  electrical  connections  are 
maintained  at all...

ELECTRICAL EQUTPMENT- ALTERNATOR 186 
ill* . . -2G ALTERNATOR - LUCAS A 127-65 .- . 
.. .. .. 
Service parts 
1. Suppression capacitors - 2 off 
2. Regula t or/Brus h box assembly 
3. Through bolts 
4.  Slip ring  end 
(SRE) bracket 
5. Stator 
6. Rectifier 
7. Drive end bracket (DRE)/bearing assembly 
8. noior 
9. Slip ring  end bearing 
25  

186 I ELECTRICAL EQUIPMENT - ALTERNATOR 
6. Check brush  spring  pressure using a push  type 
spring 
guage. Gauge  should  register 136 to 279 g (5 
to 10 02) when brush  is pressed  until face is flush 
with  housing. 
If reading is outside  these  limits, 
renew  assembly. 
7. Mark the  relative positions  of the end  brackets  and 
stator.  Remove  through bolts and withdraw  slip 
ring  end bracket and  stator assembly. Carefully  tap 
the mounting  lugs with a mallet 
if necessary. 
8. Remove...