CLUTCH & CLUTCH CONTROLS

CAR IDENTIFICATION MG A TWIN CAM

The Twin Cam MGA was a significant development for MG. It was in production from September 1958 until June 1960, during which period a total of 2111 cars were produced; they were numbered separately from regular MGA production. Being such an extensive development of the push rod 'B' series unit, the Twin Cam engine has little in common with the former. Another major difference from regular MGA's is of course the Dunlop braking system, endowing the Twin Cam with all-round disc brakes and necessitating a modified chassis plus a host of other detail changes.

MGA Roadster Identification Data

Year	Model	Numbers manufactured
September 1955 to May 1959	MGA 1500cc	10101 to 68,850
September 1958 to June 1960	MGA Twin Cam	501 to 2611
May 1959 to April 1961	MGA 1600cc	68,851 to 100,351
April 1961 to June 1962	MGA 1600cc MkII	100,352 to 109,070

BMC 'B' Series Engine Use ( 1953 to 1981)

Model	cc	Prefix	BHP/RPM	Torque
M.G. MGA	1489	BP15GB,15GB	68/5200	82
M.G. MGA	1489	15GD	72/5500	85
M.G. MGA 1600	1588	16GA	80/5600	87
MGA Twin Cam	1588	BC16GB	108/6700
M.G. MGA 1600 Mk2	1622	16GC	90/5500 97

MGA Twin Cam Chassis Numbers

YD1	RHD	Home Market Tourer
YD2	RHD	Export Market Tourer
YD3	LHD	Export Market Tourer
YM1	RHD	Home Market Coupé
YM2	RHD	Export Market Coupé
YM3	LHD	Export Market Coupé

MGA Serial Numbers

Engine Number

The engine number is stamped on a plate secured to the righthand side of the cylinder block...or it is stamped on a plate secured to the rear of the engine behind the cylinder block. (Twin Cam)

Car Number

The car number is stamped on a plate secured to the top lefthand side of the dash panel

Gearbox Number

The gearbox number is stamped on the top of the gearbox casing adjacent to the dipstick

Body Number

The body number is stamped on a plate secured to the bulkhead between the righthand bonnet hinge and the fuse block.

Rear Axle Number

The rear axle No is stamped on the front of the axle tube on the LH side next to the spring seat.

Identifying the MGA

There are only five variations of the MGA. The 1500cc, 1600cc, MkII, Twin Cam and 1600cc MkII De luxe. The Coupés were a variation of the Roadster and were not differentiated by the factory numbering system as to body style. The Twin Cam, a major undertaking at the time of its introduction, was identified separately while the De luxe, the most elusive of MGA models, was not distinctly identified. There are reliable production figures for all models except the De luxe.

The three major MGA models may be readily identified by their tail-lamp and grille configurations as well as their engine displacement.

A 1500cc will have the familiar single Lucas tail lamp, the flush style grille and no shroud or boot lid emblems. Four-wheel drum brakes were fitted to this model only.

Very early 1500ccs had different style gauge faces, an example of which can be found in the factory service manual and drivers handbook illustrations. The door rails on the first few cars were entirely of wood as were the cockpit rear corners. There are few of these seen today. The 1500's did not have the starter hump on the passenger toe board or the windscreen mounted hood clamp. The turn indicators were switched through a relay.

1600cc is differentiated by the dual rear lamp with separate turn lamps, larger round parking lamps with flat lenses and a '1600cc' marker on the cowl and rear boot lid. Disc brakes on the front greatly improved stopping power. The starter position was moved with the resulting hump on the passenger toe board.

The 1600cc MkII received the closest thing to a face lift an MGA ever got. The famous flat grille was replaced with the 'pre-crushed' version. The MkI Mini rear lamps appeared horizontally below the boot lid and the vinyl covered dash and cowl and 1600cc MkII badges were added. The chrome trim and dash escutcheon from the Coupé finished off the dash. Seat belt anchors were added to the chassis. 1600cc MkII De luxe cars used the Twin Cam chassis with the push rod 1622cc engine. Check all parts carefully, as MGA's have not always enjoyed the respect they do now, and parts have been freely exchanged with little regard for originality. When re-wiring your car, be sure to order the loom that fits your body type, not engine type.

Ill.no.	Partno.	Part	Quantity required	Info	Price
1	AHH5694	CLUTCH PEDAL RHD TURNED DOWN REF. JXM	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
2	AAA4129	BUSH PB BRAKE/CLUTCH	1		CHF 12.05

Ill.no.	Partno.	Part	Quantity required	Info	Price
3	AHH5100	PEDAL RUBBER MGA&B	1		CHF 2.90

Ill.no.	Partno.	Part	Quantity required	Info	Price
4	AAA1628	SPRING RETURN PEDAL	1		CHF 3.30

Ill.no.	Partno.	Part	Quantity required	Info	Price
5	CLZ515	CLEVIS PIN 5/16" x 1"	1		CHF 3.85

Ill.no.	Partno.	Part	Quantity required	Info	Price
6	GHF301	WASHER 5/16 X 5/8 M8	1		CHF 0.40

Ill.no.	Partno.	Part	Quantity required	Info	Price
7	GHF501	SPLITPIN 5/64X1.5IN	1		CHF 1.85

Ill.no.	Partno.	Part	Quantity required	Info	Price
8	BHA4072Z	M/CYL CLUTCH MGA TC, 5/8" (0.625")	1		CHF 95.95

Ill.no.	Partno.	Part	Quantity required	Info	Price
9	GRK1029	REPAIR KIT, CLUTCH MASTER CYLINDER, 5/8"	1		CHF 13.55

Ill.no.	Partno.	Part	Quantity required	Info	Price
10	500201	CAP MASTER CYLINDER SMALL	1		CHF 14.95
10	500201Z	CAP BLK SUPPLY TANK	1		CHF 15.85

Ill.no.	Partno.	Part	Quantity required	Info	Price
13	SH605101	SCREW 5/16" UNF X 1 1/4"	2		CHF 2.25

Ill.no.	Partno.	Part	Quantity required	Info	Price
14	GHF222	NUT 5/16UNF NYLOC	2		CHF 1.95

Ill.no.	Partno.	Part	Quantity required	Info	Price
15	GHF301	WASHER 5/16 X 5/8 M8	2		CHF 0.40

Ill.no.	Partno.	Part	Quantity required	Info	Price
16	AHH5822	CLUTCH PIPE RHD	1		CHF 40.65
16	AHH5824	CLUTCH PIPE, LHD	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
17	GBH178	BRAKE HOSE, REAR, FLEXIBLE, LH	1	standard	CHF 29.25
17	GBH178Z	BRAKE HOSE, REAR, FLEXIBLE, LH, AFTERMARKET	1	aftermarket	CHF 12.00
17	TT3242	BRAKE HOSE SET, REAR, PAIR, STAINLESS STEEL BRAIDED	1	uprated	CHF 85.00

Ill.no.	Partno.	Part	Quantity required	Info	Price
18	NT606041	NUT 3/8 UNF THIN	1		CHF 1.55

Ill.no.	Partno.	Part	Quantity required	Info	Price
19	GHF323	WASHER STAR INT 3/8	1		CHF 0.45

Ill.no.	Partno.	Part	Quantity required	Info	Price
20	3H550	COPPER WASHER 7/16X0.7	1		CHF 1.75

Ill.no.	Partno.	Part	Quantity required	Info	Price
21	PCR411	P CLIP, 1/4" CABLE DIAMETER X 11/32"	1		CHF 4.45

Ill.no.	Partno.	Part	Quantity required	Info	Price
22	GSY111	SLAVE CYLINDER, CLUTCH	1		CHF 58.25

Ill.no.	Partno.	Part	Quantity required	Info	Price
23	GRK4017	REPAIR KIT, CLUTCH SLAVE CYLINDER 1"	1		CHF 18.05

Ill.no.	Partno.	Part	Quantity required	Info	Price
27	3H2428	BLEED NIPPLE MGA S&M, 3/8 UNF	1		CHF 3.60

Ill.no.	Partno.	Part	Quantity required	Info	Price
28	BLS106	BALLBEARING 3/16 DIA	1		CHF 0.90

Ill.no.	Partno.	Part	Quantity required	Info	Price
29	SMP100030	DUSTCAP BLEED NIPPLE	1		CHF 2.25

Ill.no.	Partno.	Part	Quantity required	Info	Price
30	1B3701	PUSH ROD	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
31	2K5622	CLEVIS PIN	1		CHF 4.30

Ill.no.	Partno.	Part	Quantity required	Info	Price
32	GHF301	WASHER 5/16 X 5/8 M8	1		CHF 0.40

Ill.no.	Partno.	Part	Quantity required	Info	Price
33	GHF501	SPLITPIN 5/64X1.5IN	1		CHF 1.85

Ill.no.	Partno.	Part	Quantity required	Info	Price
34	NT605041	NUT 5/16 UNF JAM THIN	1		CHF 1.20

Ill.no.	Partno.	Part	Quantity required	Info	Price
35	FEZ105	FORK END CLUTCH MASTER CYLINDER	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
36	3H868	BANJO CLUTCH TWINCAM	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
37	13H1984	BANJO BOLT CLUTCH L26685	1		CHF 21.10

Ill.no.	Partno.	Part	Quantity required	Info	Price
38	233220A	COPPER WASHER 3/8ID 5/8 OD	1		CHF 2.45

Ill.no.	Partno.	Part	Quantity required	Info	Price
39	3H550	COPPER WASHER 7/16X0.7	1		CHF 1.75

Ill.no.	Partno.	Part	Quantity required	Info	Price
40	BH506121	BOLT 3/8UNCX1 1/2	2		CHF 2.90

Ill.no.	Partno.	Part	Quantity required	Info	Price
41	GHF333	WASHER SPRING 3/8	2		CHF 0.95

Ill.no.	Partno.	Part	Quantity required	Info	Price
51	AEH650	DISTANCE WASHER MGA TWIN CAM	6		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
52	27H3248E	CLUTCH COVER ASSY REBUILT NCA	1	reconditioned	availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
53	038788A	RETAINER-CLUTCH COVER THRUST PLATE NO LONGER AVAIL	3		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
54	042537A	PIN	3		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
55	231883A	ANTI RATTLE SPRING	3		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
56	27H8347	EYE BOLT	3		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
57	7H3213	RELEASE PLATE	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
58	7H3169	SPRING	6		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
59	WE702101	WASHER, SHAKEPROOF, 3/16"	3		CHF 0.75

Ill.no.	Partno.	Part	Quantity required	Info	Price
60	GCP132	CLUTCH PLATE 8" MGA1500EARLY	1		CHF 107.15

Ill.no.	Partno.	Part	Quantity required	Info	Price
61	GRB103	CLUTCH RELEASE BEARING	1		CHF 34.85

Ill.no.	Partno.	Part	Quantity required	Info	Price
62	7H3048	BEARING CLIP	2		CHF 2.60

Ill.no.	Partno.	Part	Quantity required	Info	Price
63	SH605071	SCREW 5/16" UNF X 7/8"	6		CHF 2.05

Ill.no.	Partno.	Part	Quantity required	Info	Price
64	GHF332	WASHER SPRING 5/16	6		CHF 1.10

Ill.no.	Partno.	Part	Quantity required	Info	Price
1	AHH5694	CLUTCH PEDAL RHD TURNED DOWN REF. JXM	1		availability request
2	AAA4129	BUSH PB BRAKE/CLUTCH	1		CHF 12.05
3	AHH5100	PEDAL RUBBER MGA&B	1		CHF 2.90
4	AAA1628	SPRING RETURN PEDAL	1		CHF 3.30
5	CLZ515	CLEVIS PIN 5/16" x 1"	1		CHF 3.85
6	GHF301	WASHER 5/16 X 5/8 M8	1		CHF 0.40
7	GHF501	SPLITPIN 5/64X1.5IN	1		CHF 1.85
8	BHA4072Z	M/CYL CLUTCH MGA TC, 5/8" (0.625")	1		CHF 95.95
9	GRK1029	REPAIR KIT, CLUTCH MASTER CYLINDER, 5/8"	1		CHF 13.55
10	500201	CAP MASTER CYLINDER SMALL	1		CHF 14.95
10	500201Z	CAP BLK SUPPLY TANK	1		CHF 15.85
13	SH605101	SCREW 5/16" UNF X 1 1/4"	2		CHF 2.25
14	GHF222	NUT 5/16UNF NYLOC	2		CHF 1.95
15	GHF301	WASHER 5/16 X 5/8 M8	2		CHF 0.40
16	AHH5822	CLUTCH PIPE RHD	1		CHF 40.65
16	AHH5824	CLUTCH PIPE, LHD	1		availability request
17	GBH178	BRAKE HOSE, REAR, FLEXIBLE, LH	1	standard	CHF 29.25
17	GBH178Z	BRAKE HOSE, REAR, FLEXIBLE, LH, AFTERMARKET	1	aftermarket	CHF 12.00
17	TT3242	BRAKE HOSE SET, REAR, PAIR, STAINLESS STEEL BRAIDED	1	uprated	CHF 85.00
18	NT606041	NUT 3/8 UNF THIN	1		CHF 1.55
19	GHF323	WASHER STAR INT 3/8	1		CHF 0.45
20	3H550	COPPER WASHER 7/16X0.7	1		CHF 1.75
21	PCR411	P CLIP, 1/4" CABLE DIAMETER X 11/32"	1		CHF 4.45
22	GSY111	SLAVE CYLINDER, CLUTCH	1		CHF 58.25
23	GRK4017	REPAIR KIT, CLUTCH SLAVE CYLINDER 1"	1		CHF 18.05
27	3H2428	BLEED NIPPLE MGA S&M, 3/8 UNF	1		CHF 3.60
28	BLS106	BALLBEARING 3/16 DIA	1		CHF 0.90
29	SMP100030	DUSTCAP BLEED NIPPLE	1		CHF 2.25
30	1B3701	PUSH ROD	1		availability request
31	2K5622	CLEVIS PIN	1		CHF 4.30
32	GHF301	WASHER 5/16 X 5/8 M8	1		CHF 0.40
33	GHF501	SPLITPIN 5/64X1.5IN	1		CHF 1.85
34	NT605041	NUT 5/16 UNF JAM THIN	1		CHF 1.20
35	FEZ105	FORK END CLUTCH MASTER CYLINDER	1		availability request
36	3H868	BANJO CLUTCH TWINCAM	1		availability request
37	13H1984	BANJO BOLT CLUTCH L26685	1		CHF 21.10
38	233220A	COPPER WASHER 3/8ID 5/8 OD	1		CHF 2.45
39	3H550	COPPER WASHER 7/16X0.7	1		CHF 1.75
40	BH506121	BOLT 3/8UNCX1 1/2	2		CHF 2.90
41	GHF333	WASHER SPRING 3/8	2		CHF 0.95
51	AEH650	DISTANCE WASHER MGA TWIN CAM	6		availability request
52	27H3248E	CLUTCH COVER ASSY REBUILT NCA	1	reconditioned	availability request
53	038788A	RETAINER-CLUTCH COVER THRUST PLATE NO LONGER AVAIL	3		availability request
54	042537A	PIN	3		availability request
55	231883A	ANTI RATTLE SPRING	3		availability request
56	27H8347	EYE BOLT	3		availability request
57	7H3213	RELEASE PLATE	1		availability request
58	7H3169	SPRING	6		availability request
59	WE702101	WASHER, SHAKEPROOF, 3/16"	3		CHF 0.75
60	GCP132	CLUTCH PLATE 8" MGA1500EARLY	1		CHF 107.15
61	GRB103	CLUTCH RELEASE BEARING	1		CHF 34.85
62	7H3048	BEARING CLIP	2		CHF 2.60
63	SH605071	SCREW 5/16" UNF X 7/8"	6		CHF 2.05
64	GHF332	WASHER SPRING 5/16	6		CHF 1.10