Starter motors and dynamo

Inertia Starter Motors
Inertia type starter motors were fitted to Minis up until 1985. An inertia starter fitted car can be identified by the starter solenoid being elsewhere in the engine bay, connected to the motor by a heavy duty cable.

There are four types of inertia starter motor, all originally manufactured by Lucas. While they appear quite different in construction, they are in fact interchangeable. If you intend to repair your starter motor, take care to correctly identify which of the types it is before ordering parts - it will have 'M35H', 'M35G', 'M35J' or 'M35K' stamped on the casing. There should also be on the casing a 5-digit Lucas part number, which will also assist in ordering some parts.

Reconditioned Starter Motor
Genuine reconditioned starter motors have more recently been manufactured to a specification closely resembling the M35J type, irrespective of the type of old unit used in the reconditioning process. This means that they all now use the later design axial brushes (GSB105) and a 'face-contacting' commutator.
Non-genuine reconditioned units may still be built up as either M35H, M35G, M35J or M35K units, depending on spares availability for the designs.

Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
1	GXE4404	STARTER MOTOR, reconditioned, exchange	1	All models.

Original M35H and M35G Type Starter Motors (Lucas part numbers 25071A/F, 25075 and 25083J)
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
2	47H5342	NUT, pinion retaining	1	25071 and 25075 starter motors.
3	7H6887	CLIP, pinion retaining	1	25083 starter motors.
4	7H5045	SPRING	1
5	27H6828	PINION AND BARREL SET	1	25071 starter motors.
6	7H5046	PINION AND BARREL SET	1	25075 starter motors.
	67H5010	PINION AND BARREL SET	1	25083 starter motors.
7	47H5344	SPRING, pinion retaining	1	25071 starter motors.
8	7H5047	SPRING, pinion return	1	25075 starter motors.
9	47H5348	FIELD COIL SET	1	25071 starter motors.
	37H7502	FIELD COIL SET	1	25075 and 25083 starter motors.
10	47H5346	BUSH, driving end	1
11	47H5341	SPRING SET	1
12	47H5340	BUSH, commutator end	1
13	GSB102	BRUSH SET, radial acting	1
14	47H5349	SUNDRY PARTS KIT	1	25071 starter motors.
	7H5156	SUNDRY PARTS KIT	1	25075 and 25083 starter motors.

Original M35J Type (Lucas part number 25147B) and M35K Starter Motors
The M35K type starter was fitted for a very short period in the 1970s and is very poorly documented. If you have an M35K type starter, commonly used service parts such as brushes, the pinion and barrel set, retaining clip and spring are the same as M35J components. We cannot however vouch for the compatibility of other parts.
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
15	7H6887	CLIP, pinion retaining	1
16	7H5045	SPRING	1
17	67H5010	PINION AND BARREL SET	1
18	AAU9326	FIELD COIL SET	1
19	37H4672	END PLATE, commutator end	1
20	519812	BUSH KIT	1
21	GSB105	BRUSH SET, axial acting	1
22	519566	SUNDRY PARTS KIT	1

Starter Motor Mounting Hardware
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
23	SH506101	SCREW, starter motor to flywheel housing	2
24	LWZ206	WASHER, locking	2
25	PWZ106	WASHER, plain	2
	22A1898	DISTANCE PIECE, starter to torque converter housing	1	If required (1970 approx. to 1985, automatic transmission).

Starter Motor Circuit Components
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
26	17H5260	SWITCH, starter, floor mounted	1	1959-64; not Super, Cooper or Cooper S.
27	5L24	KNOB, floor starter switch	1
28	5L25	COVER, switch	1
29	LWZ206	WASHER, locking	1
30	2K7507	WASHER, fibre	1
31	5L245	COVER, dust, floor starter switch	1
32	BCA4413	STARTER SOLENOID, round, with start button	1	Lucas 2ST type, 1964-67; Super, Cooper and Cooper S, 1961-67.
33	27H5576	CAP, rubber, start button	1
34	13H5952	STARTER SOLENOID, square	1	Lucas 4ST type; 1967-85.
35	PMZ306	SCREW, solenoid attaching	2	1959-80, imperial thread.
36	WE702101	WASHER, shakeproof	2	1959-80.
37	ANZ103	NUT	2	1959-80, imperial thread.
38	PTZ1004	SCREW, self tapping, solenoid attaching	2	1975-80; alternative.
39	PWZ203	WASHER, plain	2	1975-80; alternative.
40	SE105101	SCREW, solenoid attaching	2	1980-85; metric thread.
41	WE105001	WASHER, shakeproof	2	1980-85.
42	NH105041	NUT	2	1980-85; metric thread.

Pre-Engaged Starter Motors
Pre-engaged starter motors were fitted to Minis from 1985 onwards. A pre-engaged starter motor may be identified by its integral solenoid, a large round cylinder riding piggy-back style on the top of the motor. Pre-engaged starters are also operated by a relay, unlike the earlier inertia starters.

Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
43	GXE4527	STARTER MOTOR, reconditioned, exchange	1
44	BAU5443	DRIVE ASSEMBLY	1
45	608395A	DRIVE RETAINING KIT	1
46	NAF10004	SOLENOID ASSEMBLY	1
47	BAU5849	BRUSH BOX ASSEMBLY	1
48	BAU5446	BRUSH SET	1
49	BAU5448	PIVOT KIT	1
50	BAU5449	BUSH KIT	1
51	BAU5450	SEAL KIT	1
52	BAU5451	SUNDRY PARTS KIT	1

Starter Motor Mounting Hardware
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
53	SH506101	SCREW, starter motor to flywheel housing	2
54	LWZ206	WASHER, locking	2
55	PWZ106	WASHER, plain	2

Starter Motor Circuit Components
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
56	YWB10032	RELAY, starter motor	1
57	YRF10001	FUSIBLE LINK, starter motor circuit	1

Dynamo
A Lucas manufactured type C40 dynamo was fitted to the majority of Minis up until the mid-1970s. The dynamo casing was stamped with a 5 digit Lucas part number: 22700, 22742 and 22775 are original Mini equipment.

Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
58	GXE3101	DYNAMO, reconditioned, exchange	1	Not supplied with pulley and fan.
59	47H5395	END PLATE, commutator end	1	Includes bush, oiler and brush springs.
60	7H5390	BUSH, end plate	1
61	47H5394	OILER ASSEMBLY	1
62	RTC466A	SPRING, brush	2
63	GGB102	BRUSH SET	1
64	607141A	FIELD COIL SET	1
65	509311A	ARMATURE ASSEMBLY	1
66	27H7647	END PLATE, driving end	1
67	18G8620	BEARING, end plate	1
68	17H5217	THROUGH BOLT, dynamo assembly	2
69	17D11	FAN	1
70	12G1054	PULLEY	1	Manual models; not 850cc 1969 on, or Cooper and Cooper S.
	12A34	PULLEY	1	850cc, 1969 on.
	12G2102	PULLEY	1	Cooper and Cooper S models.
	12A1772	PULLEY	1	Automatic models.
71	37H6836	FITTING KIT, pulley and fan	1	Includes key, nut and washer
72	WKN404	KEY, woodruff	1
73	FNZ207	NUT, pulley and fan securing	1
74	LWZ207	WASHER, locking	1
75	GCB10813	DRIVE BELT, dynamo, water pump and fan	1	Use with original 3 7/8" dia. water pump pulley.

Dynamo Circuit Components
Ill. No.	Part No.	Description	Qty. Rqd.	Remarks
76	3H1835	CONTROL BOX ASSY., screw terminals	1	1959-60 models.
77	GEU6603	CONTROL BOX ASSY., Lucar spade terminals	1	1960 on models.
78	PTZ1012	SCREW, self tapping, control box to dash	2
79	GHF1030	NUT, Lokut	2

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Starter motors and dynamo

BRUSH SET-PRE-ENGAGED STARTER MOTOR

DRIVE ASSY.-PRE-ENGAGED STARTER MOTOR

FIELD COIL SET-M35K INERTIA STARTER MOTOR

CLIP-PINION RETAINING-25083 INERTIA STARTER MOTOR

BUSH-COMMUTATOR END PLATE-DYNAMO

SUNDRY PARTS KIT-25075 & 25083 INERTIA STARTER MOTOR

SPRING-PINION RETURN-25075 INERTIA STARTER MOTOR

PINION AND BARREL SET-25075 INERTIA STARTER MOTOR

SPRING-PINION-INERTIA STARTER MOTORS

PINION AND BARREL SET, 9 TEETH-25083 INERTIA STARTER MOTOR (SHOP SOILED)

DRIVE RETAINING KIT-PRE-ENGAGED STARTER MOTOR

FIELD COIL SET-DYNAMO

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