Land Rover 90 110 Workshop Rover Manual

							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 sparking  is good 
but  engine 
will not  start,  proceed  to Test 6. 
If no  sparking, replace coil. 
If engine  will not start  carry  out Test 6. 
Test 5 
Crank 
TEST 6: 
Check  Rotor Arm 
Remove  distributor  cover.  Disconnect coil HT lead 
from  cover  and hold  about 
3 mm (0.13 in) above rotor 
arm  electrode  and crank  the engine.  There should  be 
no 
HT sparking  between  rotor  and HT lead. If 
satisfactory carry out Test 7. 
HT  sparking, replace  rotor arm. 
If  engine 
will not  start  carry  out Test 7. 
Test 6 
Crank 9 engine 
//IF 
RR465M Q 
Examine:  Should be: 
1. Distributor Cover  Clean, dry, no tracking marks 
2. CoilTop Clean,  dry, no tracking  marks 
3. HT Cable  Insulation  Must not  be  cracked chafed or 
perished 
4. HT Cable Continuity Must  not be open  circuit 
5. Sparking  Plugs  Clean, dry,  and  set to correct 
gap- NOTE: 
1. Reluctor  Must not foul pick-up or leads 
2. RotorandFlash Must  not  be  cracked or show 
Shield  signs  of tracking marks. 
I . ..- .. , ,,.! .,. ,. !, .. 
11  
						

							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 connecting  rod 
from  pick
-up base  plate  connecting  peg, and 
withdraw  vacuum unit from  distributor  body. 
Re-Assem bly 
14. This is mainly a reversal  of the dismantling 
procedure,  noting the following  points: 
Lubrication 
Apply  clean engine oil: 
(a) 3 drops to felt pad  reservoir in rotor shaft. 
Apply  Chevron SH1 (or equivalent) grease. 
(b)  Auto  advance  mechanism 
(c)  Pick
-up plate centrc bearing 
(d)  Pre 
tilt spring  and its rubbing  area (pick-up and 
(e) Vacuum  unit connecting  peg (pick-up and  base 
(f) the  connecting  peg hole in vacuum unit 
Apply Rocal  MHT (or equivalent)  grease. 
(8) Vacuum unit connecting rod seal (located in 
base plate  assy) 
assy)  and 
connecting  rod. 
vacuum  unit where  connecting  rod protrudes) 
NOTE:  Applicable  only  to double  acting 
vacuum  units. 
=, - 42- I -- ,, 
Pick-up and Base Plate Assembly 
9. Use circlip  pliers to remove  the circlip  retaining the 
reluctor  on rotor  shaft. 
10. Remove  the flat washer and then  the 0 ring 
recessed 
in the  top of the reluctor. 
11. Insert  the blade  of a small screwdriver bcneath the 
reluctor  and prise 
it partially  along the shaft, 
sufficient 
to enable  it to be gripped  between  fingers 
and  withdrawn  from 
the shaft. 
NOTE: Coupling  ring fitted beneath reluctor. 
12. 
Remove  pick-up and  base  plate  assembly,  secured 
by 
3 support  pillars. 
NOTE: Do not disturb  the 2 barrel nuts securing  the 
pick
-up  module,  otherwise the  air  gap  will  need 
re-adjustment. 
Fitting Pick-up and  Base  Plate Assembly 
15. Pick up leads  must be prevented  from fouling  the 
rotating  reluctor.  Both leads  should 
be located in 
plastic  carrier as illustrated.  Check during re- 
assembly. 
13. Renew pick-up and  base  plate  assembly if module 
is  known  to be  faulty,  otherwise  check pick
-up 
winding  resistance 
(2k-5k ohms). 
TECHNICAL  DATA 
Firing angles ..................................................... 0-45-90 etc. ? 1 
Appiicaiivn ....................................................... 1~. v iyGpiivG L11 
(Pick up limbheluctor tooth) ................................. 0.20 mm - 0.35 mm (0.008 in - 0.014 in) 
1?TI hl--,. *: .,,. ,...,I. 
Pick up air  gap  adjustment 
Pick  up winding  resistance 
.................................... 2k - 5k ohms 
12  
						

							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 specified  limits, using a 
non
-ferrous  feeler gauge. 
NOTE 
1: 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 
gpecified limits. 
- . See technical  data. 
.. .~ .. , I. 
AMPLIFIER 
Remove and Refit 
Removing  The 
Lucas 
35DLM8 distributor  has a conventional 
advancehetard 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 is being changed or the base 
plate  has been  moved.  Use a non
-ferrous  feeler gauge  to 
set  the  air gap. 
DISTRIBUTOR 
- 35DLM8 
Remove  and refit 
Removing 
18. Disconnect  the battery. 
19. Disconnect  the electrical lcads from  the amplifier 
and coil. 
20. Remove the two  retaining  bolts with washers 
securing  the coil 
to the  amplifier. 
21. Remove the  two bolts securine thc amdifier to the 
Disconnect battery. 
2. Disconnect  vacuum pipe(s). 
3. 
4. Disconnect low tension lead  from coil. 
5. Mark  distributor  body  in relation  to  centre  line of 
distributor cap. 
 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. 
6. Add  alignment  marks to distributor  and front  cover. 
13  
						

							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 plug lead numbers. 
RH - Right-hand  side of engine,  when  viewed 
from  the rear. 
LH 
- Left-hand  side of engine,  when  viewed  from 
the rear. 
A 
@) 
y 
RR616M 
9. If  engine  has not  been turned  whilst distributor  has 
been  removed, proceed  as follows  (items 
10 to 17). 
10. Fit  new 0 ring  seal to distributor  housing. 
11. Turn distributor  drive until centre line of rotor arm 
is 30 anti-clockwise from mark  made  on top  edge 
of distributor body. 
12. 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. 
14 
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 will 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 in 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 35DLM8 
Overhaul 
DISTRIBUTOR  COVER 
1. Unclip and remove  the cover. 
2.  Renew the  cover 
if known to be faulty. 
3. Clean  the  cover  and HT brush 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 three  screws. 
7. Renew  cover if known to be faulty. 
VACUUM  UNIT 
8. 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 
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. 
recessed  in the  top 
of the  reluctor. 
15 
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: 
a. Threc 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 be located in 
plastic  carrier as illustrated.  Check  during re- 
assembly. 
REFITTING 
RELUCTOR 
19. Slidc reluctor as far as it will go on rotor shaft,  then 
rotatc reluctor until it engages  with the  coupling 
ring  beneath 
the pick-up base  plate. The 
distributor  shaft,  coupling  ring and  reluctor are 
‘kcycd’  and rotate  together.  Fit the ‘0’ ring, flat 
washcr and retaining  circlip. 
PICK
-UP AIR GAP  ADJUSTMENT 
20. The air gap  between  the pick-up limb  and reluctor 
teeth  must 
be sct within  the spccified limits, using ;I 
non-ferrous feeler gauge. 
21. If adjustmcnt is necessary,  slacken the two  barrel 
nuts to set 
the air  gap.  See Engine Tuning  Data. 
Apply  Chevron 
SR1 (or equivalent)  grease. 
b. Auto advance mechanism. 
c.  Pick
-up plate  centre bearing. 
d. 
e. 
f. 
Pre tilt spring  and  its rubbing  area  (pick-up  and 
base plate  assy). 
Vacuum  unit  connecting  peg  (pick
-up  and base 
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. 
checked, and sdjusted if?--------. I cLcn3ai y . 
15  
						

							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  
						

							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 
crcate failure to 
comply  with the emission  regulations  applying  to 
the  country  of destination.  If the  engine  is being 
checked 
in thc 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  reason, the ignition  timing 
must  be set  statically  to 
6 B.T.D.C. 
(This sequence  is to  give  only an  approximation in 
order that the engine  may be started) ON  NO 
ACCOUNT  MUST  THE ENGINE  BE STARTED 
BEFORE THIS OPERATION 
IS CARRIED  OUT. 
T ..:: ;I ., . .. ,.. . , I, .. . 
LUCAS  CONSTANT  ENERGY  IGNITION SYSTEM 
35DLM8 PRELIMINARY  CHECKS 
Inspect  battcry  cables  and conncctions to ensure they 
are clcan and  tight.  Check battery state of charge if in 
doubt as to its  condition. 
Inspect 
all LT connections to ensure that they are  clean 
and  tight.  Check 
the HI leads are corrcctly positioncd 
and not shorting  to earth  against  any cnginc 
components.  The wiring  harness  and  individual  cables 
should  be firmly  fastened  to prevent  chafing. 
PICK-UP AIR  GAP 
Check  air gap  with a non-ferrous  feeler gauge. 
NOTE:  The  gap  is  set  initially at the  factory  and will 
only  require  adjusting  if tampered  with or when the 
pick-up module is replaced. 
TEST 
1: 
Check HT Sparking 
Equipment required 
Calibrated  Tachometer 
Stroboscopic  lamp  start  er. 
Remove 
coil/distributor HT lead 
from distributor  cover 
and  hold  approximately 
6 mm (0.25 in) from  the 
engine  block. Switch 
thc ignition  on  and operate thc 
If regular sparking  occurs,  proceed  to Test 6. If no sparking proceed to Test 2. 3. Couple stroboscopic timing lamp and tachometer 
to engine  following  the manufacturers  instructions. 
4. Disconnect thc vacuum  pipes from  the distributor. 
5. Start  engine, with no load and not exceeding 
3,000 rpm,  run  engine  until normal  operating 
temperature  is reached. (Thermostat  open). Check 
that  the  normal  idling  speed falls  within  the 
tolerance  specified 
in the data  section. 
6. Idle  speed for timing  purposes  must not exceed 
750rpm, and this speed  should  bc achieved  by 
removing  a breather  hose 
NOT BY ADJUSTING 
IDLE SETTING  SCREWS. 
7. With  the distributor  clamping bolt slackened  turn 
distributor  until  the timing  flash coincides  with the 
timing  pointer and  the  correct timing  mark  on  the 
rim 
of the  torsional  vibration  damper as shown  in 
the engine tuning section. 
8. Retighten  the distributor  clamping  bolt  securely. 
Recheck timing in the event  that  retightening  has 
disturbed  the distributor  position. 
.:. , . ... ... ..i 
... .. .. 
EA2262 
9. Refit vacuum pipes. 
10. Disconnect stroboscopic  timing lamp and 
tachometer  from engine. 
17  
						

							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  below volts  at point  1 in test circuit 
v4. 
0 volt -0.1 volt 
(c)  If all  readings  are correct proceed  to 
Tcst 3. 
(d)  Check  incorrect 
reading(s) with  chart  to identify 
area 
of possiblc faults,  i.e.  faults  listed  under 
heading  Suspect. 
(e) 
If coil or amplifier  is suspected,  disconnect LT lead 
at 
coil, repeat  V3. If voltage is still incorrect, fit 
new  coil. If voltage  is  now correct,  check LT lead, 
if satisfactory fit new amplifier. 
(f) If engine will not start proceed to Tcst 3. 
V L L V I Ign. switch and/orwirin I 
Check Amplifier Switching 
Connect  the voltmcter between  battery  positive (+ ve) 
terminal and FIT coil negative (- ve)  tcrminal:  the 
voltmeter should  register zero volts. 
Switch  the ignition 
on and  crank  the engine. Thc 
voltmeter  reading  should  increase just above  zero, in 
which case proceed  with Test 5. 
If there  is no increase in voltage  during cranking 
proceed  to Test 
4. 
TO DfSTRlBUTOR - 
CRANK 
TO AMPLIFIER 
TO IGN TO  STARTER 
SWITCH 
c ? RR2264E 
TEST 4: 
Pick-up Coil Resistance. 
Disconnect  the pick-up leads at  the harncss  connector. 
Connect  the ohmmeter  lcads 
to the two pick-up lcads in 
the plug. 
The  ohmmeter  should 
registcr between 2k and  5k ohms 
if pick-up  is satisfactory.  If the ohmmcter reading  is 
correct,  check all connections  between pick
-up  and 
amplificr, if satisfactory, fit new amplifier. If the engine 
still  does  not start  carry  out Test 
5. 
Change thc pick-up if ohmmeter  reading is incorrect. If 
the  engine  still does  not start  proceed  to Test 5. 
18  
						

							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 Test 6. 
CRANK # 
TEST 6: 
Rotor Arm 
Remove  distributor  cover. Disconnect  coil HT lead 
from 
covcr and using insulatcd pliers,  hold about 3 mm 
(0.13 in)  above  rotor arm electrode and crank  the 
engine.  There should  be 
no HT sparking bctwecn rotor 
and 
HT lead. If satisfactory  carry out Test 7. 
If HT  sparking  occurs, an  earth fault on the rotor arm  is 
indicated. 
Fit new  rotor arm. 
If engine will not start  carry out Test 7. 
TEST 7: 
Visual  and HT Cable  Checks 
Examine:  Should bc: 
1. Distributor Cover  Clean, dry, no tracking marks 
2. CoilTop Clean, dry, no tracking marks 
3. HT  Cable Insulation  Must not be cracked  chafed or 
perished 
4. HT Cable Continuity  Must not  be open  circuit 
5. Sparking  Plugs  Clean,  dry,  and set to correct 
gap. NOTE: 
1.  Reluctor  Must not foul  pick
-up or leads 
2. Rotor and Flash  Must not be cracked or show 
Shield 
signs of tracking  marks. 
R R 2 2 6 7 E 
I. , . .. . 
19  
						

							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 regulator  leads. 
6. Remove  the  screw securing the regulator to the 
brush  box and  withdraw  the regulator.  Note  that 
this  screw  also  secures 
the inner brush  mounting 
plate 
in position. 
% 
Removing  brush box assembly 
7. Remove  the screw  retaining  the  outer  brush 
8. Withdraw both brushcs. 
9. Remove  the  two  screws securing  the brush  box to 
the slip ring  end bracket  and lift off the  brush box. 
mounting 
plate. 
Removing  the rectifier  assembly 
10. 
11. 
Securely  clamp the alternator  and release the stator 
winding  cable ends from 
the rectifier  by applying a 
hot  soldering  iron to the  tcrminal  tags of the 
rectifier.  When the solder  melts prise out the cable 
end.  Remove  the two  remaining  screws securing  the 
rectifier  assembly  to the  slip  ring  end bracket  and 
lift off the rectifier. 
NOTE:  Further  dismantling of the rectifier  is not 
required. 
Removing  the slip  ring  end bracket 
12. Sccurely clamp  the alternator  and remove the thrce 
13. Lift off the bracket. If necessary  tap under  each 
fixing 
bolts. 
fixing  bolt 
with a soft  mallet. 
Removing  stator assembly 
14. Note the position  of the stator output  leads relative 
to  the  alternator  fixing 
lugs and then lift the stator 
from  the drive  end bracket. 
15. 
16. 
17. 
18. 
Separating  drive end bracket  and rotor 
Remove  the shaft  nut washers  from  the  pulley, 
woodruff 
kcy and spacers. 
Use a  press  to remove  the rotor  shaft  from  the 
drive  end bearing. 
Check 
all components  as  detailed under bench 
testing  and renew  any parts that arc  unsatisfactory. 
If  necessary  the slip  rings  and 
or thc slip ring  end 
bearing  on the  rotor  shaft can bc 
rcplaced. To 
renew the bearing, both  slip rings  must  be rcmoved 
as follows: 
Unsolder  outer slip  ring  connection  and gently 
prise  the slip ring  off 
the shaft. 
Unsolder  inner slip  ring 
conncction and gently 
prise 
the slip ring  off the shaft. 
Whilst  carrying  out the above  two 
imtructions take care 
not  to damage 
the insulation  covering  the winding 
leads. 
ELECTRICAL  TEST OF COMPONENlS 
The illustrations  for  the following tcsts show  the 
Components 
scparated from the altcrnator, for  clarity. 
Rotor  field winding 
19. Chcck field  winding  continuity and resistance 
simultaneously,  by connecting  either 
a battery- 
operated  ohmmeter  (illustration A) or a 12 volt 
battery  and moving  coil  ammeter (illustration 
B) 
between  the slip  rings. The ohmmetcr should 
indicate  the  appropriate  resistance given 
in the 
data, 
or it should  indicate a current approximate  to 
the  figure  obtained  by dividing  the appropriate 
resistance  of the  rotor into the  battery voltage. 
A 
ST!282??! 
20