Distributors - Carburetter Models

Dynamo and Alternator Mountings
No. Part No. Description Qty. Remarks No. Part No. Description Qty. Remarks
Dynamo Mountings
1 12A526 BRACKET, dynamo mounting, rear 1
2 SH605061 SCREW, bracket to engine 2
3 LWZ305 WASHER, locking 2
4 SH605101 SCREW, dynamo to bracket 1
5 PWZ305 WASHER, plain 2
6 GHF222 NUT, nyloc 1
7 BH605141 BOLT, dynamo to water pump 1 Not Cooper S 1963-69.
SH605151 SCREW, dynamo to water pump 1 Cooper S 1963-69.
8 PWZ305 WASHER, plain 2
9 LNZ205 NUT, nyloc 1
10 2A128 PILLAR, adjusting link 1 850cc and 1000cc to 1969; Cooper
models except S, 1961-63.
12G289 PILLAR, adjusting link 1 Cooper models except S, 1963-69;
all models except Cooper S , 1969 on.
AEG182 PILLAR, adjusting link 1 Cooper S models .
11 FNZ106 NUT, pillar to engine bearer plate 1
12 LWZ306 WASHER, locking 1
13 12H67 LINK, adjustment 1 All 850cc models; 1000cc models up
to 1969.
2A497 LINK, adjustment 1 Cooper S models up to 1969; 1000cc
models 1969 on.
12G2193 LINK, adjustment 1 Cooper S models 1969 on; 1275GT
models.
14 GHF223 NUT, nyloc, link to pillar 1
15 PWZ106 WASHER, plain 1 Not Cooper S models.
1B8806 WASHER, plain 1 Cooper S models.
16 SH505091 SCREW, link to dynamo 1 Not Cooper S models.
SH505121 SCREW, link to dynamo 1 Cooper S models.
17 LWZ305 WASHER, locking 1
Alternator Mountings
1959-80 (A Series Engine)
18 12G1053 BRACKET, rear 1
19 SH605071 SCREW, bracket to engine 2
20 LWZ305 WASHER, locking 2
21 SH605121 SCREW, alternator to rear bracket 1
22 PWZ305 WASHER, plain 2
23 GHF222 NUT, nyloc 1
24 BH605141 BOLT, alternator to water pump 1
25 PWZ305 WASHER, plain 2
26 GHF222 NUT, nyloc 1
27 2A128 PILLAR, adjusting link 1 850 and 1000cc models , 1959-69.
12G289 PILLAR, adjusting link 1 850 and 1000cc models, 1969-80;
1275 GT.
12G1582 PILLAR, adjusting link 1 Cooper S, 1963-69.
AEG182 PILLAR, adjusting link 1 Cooper S 1969 on.
28 FNZ106 NUT, pillar to engine bearer plate 1
29 LWZ306 WASHER, locking 1
30 12G2193 LINK, adjustment 1 1959-69.
12G2627 LINK, adjustment 1 1969-80.
31 GHF223 NUT, nyloc, link to pillar 1
32 PWZ106 WASHER, plain 1
33 SH505051 SCREW, link to alternator 1
34 LWZ305 WASHER, locking 1
52 PWZ106 WASHER, plain 1 1980-85.
53 SH606111 SCREW, link to engine bearer plate 1 1985-96.
54 PWZ106 WASHER, plain 1 1985-96.
55 TAM1645 DISTANCE PIECE, link 2 1985-96.
56 FNZ106 NUT, securing screw to 1 1985-96.
engine bearer plate
57 FNZ106 NUT, securing link to screw 1 1985-96.
58 LWZ506 WASHER, shakeproof 1 1985-96.
59 SH505051 SCREW, link to alternator 1 UNC thread; 1980.
SH108181 SCREW, link to alternator 1 Metric thread; 1980-96.
If your alternator has a stepped black plastic cover on the back,it is a 16ACR or 17ACR alternator and
takes a UNC threaded screw. If the alternator has a flat plastic cover on the back with a small canshaped
capacitor screwed to it, it will be an A115/45 alternator and will take a metric screw.
60 LWZ305 WASHER, locking 1 1980
GHF382 WASHER, locking 1 1980-96.
YLU101920 BRACKET, alternator 1 Air conditioned models.
YLU101930 BRACKET, adjustment 1 Air conditioned models.
YLR100120 COVER, alternator fan 1 Air conditioned models.
YKQ100030 FINGER GUARD,alternator fan 1 Air conditioned models.
1997 On (A Series K70, K71 and K72 Type Engine)
61 YLU102500 BRACKET, upper 1 Not air conditioned models .
62 YLL100100 DOWEL RING , upper bracket 1 Not air conditioned models .
63 FS108207 SCREW, upper bracket to engine 3 Not air conditioned models .
64 FB108241 BOLT, securing alternator 2 Not air conditioned models .
65 YLU102340 BRACKET, alternator and air conditioning 1 Air conditioned models.
66 FS108207 SCREW, alternator and air conditioning 4 Air conditioned models.
bracket to engine
67 FS108207 SCREW, securing alternator 1 Air conditioned models.
68 PQM100120 STUD, hexagonal, securing alternator 1 Air conditioned models.
69 FN108047 NUT,alternator to stud 1 Air conditioned models.
70 PRF100000 FINGER GUARD, drive belt 1
71 FN108047 NUT, securing finger guard 1
Adjusting the Fan Belt
However tempting it may be, do not use a jack handle to lever out the dynamo/alternator on its
mountings to tension a loose, squealing fan belt! Over-tensioning the fan belt will lead to damaging the
bearings on the dynamo/alternator, damaging the water pump bearing (sometimes both together),or
breaking one of the mounting brackets - resulting in a frustrating hunt for a new bracket if yours is one
of the earlier or rarer types.
A fan belt should be capable of being tensioned by hand, only maybe using a pr y such as a long
handled screwdriver to hold the dynamo or alternator with the fan belt in tension while the mounting
nuts and bolts are tightened. If you can’t tension the fan belt by hand, it is either worn or stretched, or
you don’t have the correct one for your car.
If you are in any doubt about fan belt condition, replace it with a new one - given the expensive
damage that may be caused by a worn or broken fan belt, it would be cheaper in the long run.
Checking a Dynamo Circuit for Faults
If you know you have a charging problem but you’re not sure what’s causing it, first check the fan belt
tension and battery condition - man y dynamos have been needlessly replaced over the years because the
former isn’t driving the dynamo correctly or the latter is in such poor condition that it is no longer fully
capable of completing the charging circuit.
1980-96 (A+ Series Engine)
35 CAM4853 BRACKET, rear 1
36 SH605071 SCREW, bracket to engine 2
37 LWZ305 WASHER, locking 2
38 SH605121 SCREW, alternator to rear bracket 1
39 PWZ305 WASHER, plain 2
40 LWZ305 WASHER, locking 1
41 FNZ105 NUT 1
42 BH605141 BOLT, alternator to water pump 1
43 PWZ305 WASHER, plain 2
44 LWZ305 WASHER, locking 1
45 FNZ105 NUT 1
46 12G2627 LINK, adjustment 1
47 SH606161 SCREW, link to engine bearer plate 1 1980-85.
48 LWZ506 WASHER, shakeproof 1 1980-85.
49 CAM6508 SLEEVE, screw to engine bearer plate 1 1980-85.
50 FNZ106 NUT, securing link to screw 1 1980-85.
51 LWZ206 WASHER, locking 1 1980-85.
Next, using a multimeter check the wiring and the condition of the wiring connectors - you should check
the brown and yellow wire running between the large spade connector on the dynamo and the D
terminal on the control box, and the brown and green wire running between the small spade connector
on the dynamo and the F terminal on the control box. Again, faults actually caused by poor wiring or
terminal connections have caused the unnecessary replacement of dynamos in the past.
Having made sure all electrical equipment in the car is turned off, disconnect the wires from the back of
the dynamo and tape up their connectors to prevent a short circuit. Then connect a length of wire
between the two terminals on the dynamo. Start the engine and allow to idle. Connect a 0-20V moving
coil voltmeter to a good earth on the engine and to one of the dynamo terminals (be sure to connect
the voltmeter the right way round with reference to the car’s polarity).
Gently increasing the engine speed, check the voltmeter reading rises smoothly. If the highest reading is
still low (from 0-5V approx.), the dynamo is at fault. Don’t race the engine in the hope of getting a few
more volts on the meter! If the reading is stuck at zero, it may be the dynamo just needs new brushes .
If all the checks and tests so far have had good results, then the control box is the faulty component in
your charging circuit.
Tel. 01249 721421 Fax. 01249 721316 www.somerford-mini.co.uk
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