REAR AXLE & ROAD WHEELS

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
2	1G7448	LOCK NUT RHT	1		CHF 41.35
2	1G7582	HUB NUT LH THREAD	1		CHF 41.35

Ill.no.	Partno.	Part	Quantity required	Info	Price
3	2A7226	STUD DIFF LOCATING ANTI-ROLLBAR = FS050 WHS	10		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
4	GHF202	NUT PLAIN 3/8 UNF	2		CHF 0.60

Ill.no.	Partno.	Part	Quantity required	Info	Price
5	1G7584	LOCKWASHER AXLE	2		CHF 6.90

Ill.no.	Partno.	Part	Quantity required	Info	Price
6	GHF201	NUT 5/16 UNF	10		CHF 0.75

Ill.no.	Partno.	Part	Quantity required	Info	Price
7	GHF332	WASHER SPRING 5/16	10		CHF 1.10

Ill.no.	Partno.	Part	Quantity required	Info	Price
8	6K499	DRAIN PLUG	1		CHF 4.95

Ill.no.	Partno.	Part	Quantity required	Info	Price
9	6K499	DRAIN PLUG	1		CHF 4.95

Ill.no.	Partno.	Part	Quantity required	Info	Price
10	21H6060	BREATHER REAR AXLE	1		CHF 14.00

Ill.no.	Partno.	Part	Quantity required	Info	Price
11	1G7465	DIFF GASKET (BANJO)	1		CHF 2.05

Ill.no.	Partno.	Part	Quantity required	Info	Price
13	51K886	STUD	4		CHF 24.70

Ill.no.	Partno.	Part	Quantity required	Info	Price
15	GHF334	WASHER SPRING 7/16	4		CHF 1.65

Ill.no.	Partno.	Part	Quantity required	Info	Price
16	GHF203	NUT 7/16 UNF	4		CHF 0.75

Ill.no.	Partno.	Part	Quantity required	Info	Price
17	CHM163	BEARING DIFFERENTIAL CARRIER	2		CHF 41.80

Ill.no.	Partno.	Part	Quantity required	Price
18	2K7993	SHIM B/AXLE .002	a/r	CHF 5.75
18	ATB7239	SHIM B/AXLE .003	a/r	CHF 5.00
18	1G7600	SHIM B/AXLE .010	a/r	CHF 4.55

Ill.no.	Partno.	Part	Quantity required	Info	Price
19	BTB328	DIFF CAGE BANJO AXLE	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
20	BTB150	DIFFERENTIAL WHEEL 25 SPLINE	2	from Chassis no. 2371	CHF 182.30

Ill.no.	Partno.	Part	Quantity required	Info	Price
21	ATB7072	THRUST 35THOU STD	2		CHF 8.45

Ill.no.	Partno.	Part	Quantity required	Info	Price
22	ATB7123	PLANET GEAR MGB	2		CHF 135.80

Ill.no.	Partno.	Part	Quantity required	Info	Price
23	1G7445	THRUST WASHER DIFF	2		CHF 10.10

Ill.no.	Partno.	Part	Quantity required	Info	Price
24	1G7444	PINION X PIN MGB DIFF	1		CHF 64.15

Ill.no.	Partno.	Part	Quantity required	Info	Price
27	ATA7043	BOLT-CROWN WHEEL	8		CHF 14.85

Ill.no.	Partno.	Part	Quantity required	Info	Price
28	6K875	LOCKTAB MGA CROWN WHEEL & PINION	4		CHF 6.00

Ill.no.	Partno.	Part	Quantity required	Price
29	ATB7064	THRUST 0.126	a/r	CHF 63.25
29	ATB7065	THRUST 0.124	a/r	CHF 63.10
29	ATB7066	THRUST 0.122	a/r	CHF 61.95
29	ATB7067	THRUST 0.120	a/r	CHF 65.85
29	ATB7068	THRUST 0.118	a/r	CHF 60.50
29	ATB7069	THRUST 0.116	a/r	CHF 64.25
29	ATB7070	THRUST WASHER .114	a/r	CHF 52.05
29	ATB7071	THRUST 0.112	a/r	CHF 58.35

Ill.no.	Partno.	Part	Quantity required	Info	Price
30	100897A	PINION BEARING, INNER	1		CHF 60.00

Ill.no.	Partno.	Part	Quantity required	Info	Price
31	1B7240	SPACER DIFF PIN BRG	1		CHF 86.95

Ill.no.	Partno.	Part	Quantity required	Info	Price
32	2A7213	NTN BEARING PINION OUTER	1		CHF 39.75

Ill.no.	Partno.	Part	Quantity required	Price
33	ATB7102	SHIM 0.004	a/r	CHF 4.00
33	ATB7103	SHIM 0.006	a/r	CHF 7.85
33	ATB7106	SHIM 0.012	a/r	CHF 4.30
33	ATB7107	SHIM 0.020	a/r	CHF 4.10
33	ATB7108	SHIM 0.030	a/r	CHF 4.35

Ill.no.	Partno.	Part	Quantity required	Info	Price
34	88G320	SEAL DIFF NOSE BANJO	1		CHF 7.05

Ill.no.	Partno.	Part	Quantity required	Info	Price
40	ATB7258	BOLT NCA	8		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
41	GHF202	NUT PLAIN 3/8 UNF	8		CHF 0.60

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

Ill.no.	Partno.	Part	Quantity required	Info	Price
45	ATB7248	STUD NCA	8		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
46	ATB7249	STUD NCA	8		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
47	ATB7255	MGATC & DELUXE REAR AXLE FLANGE GASKET	2		availability request

Ill.no.	Partno.	Part	Quantity required	Price
48	ATB7206	HALF SHAFT WIRE WHL MGA 10 SPLINE (FOR ORIG WIRE	2	CHF 216.20
48	ATB7386	1/2 SHAFT WW1600 26SP	2	availability request
48	BTB153	HALF SHAFT AXLE, WIRE WHEELS	2	CHF 180.80

Ill.no.	Partno.	Part	Quantity required	Info	Price
50	2K8160	CORE PLUG 1-5/16DISH	2		CHF 3.80

Ill.no.	Partno.	Part	Quantity required	Info	Price
51	GHF244	NUT 7/16UNF PHILIDAS	8		CHF 5.80

Ill.no.	Partno.	Part	Quantity required	Info	Price
52	GHS211	OIL SEAL MGA/B BANJO	2		CHF 7.25

Ill.no.	Partno.	Part	Quantity required	Info	Price
53	GHB127	BEARING REAR A&B BANJO	2		CHF 35.45

Ill.no.	Partno.	Part	Quantity required	Info	Price
54	88G283	CROWNWHEEL & PINION 4.3:1	1		CHF 801.90

Ill.no.	Partno.	Part	Quantity required	Info	Price
2	1G7448	LOCK NUT RHT	1		CHF 41.35
2	1G7582	HUB NUT LH THREAD	1		CHF 41.35
3	2A7226	STUD DIFF LOCATING ANTI-ROLLBAR = FS050 WHS	10		availability request
4	GHF202	NUT PLAIN 3/8 UNF	2		CHF 0.60
5	1G7584	LOCKWASHER AXLE	2		CHF 6.90
6	GHF201	NUT 5/16 UNF	10		CHF 0.75
7	GHF332	WASHER SPRING 5/16	10		CHF 1.10
8	6K499	DRAIN PLUG	1		CHF 4.95
9	6K499	DRAIN PLUG	1		CHF 4.95
10	21H6060	BREATHER REAR AXLE	1		CHF 14.00
11	1G7465	DIFF GASKET (BANJO)	1		CHF 2.05
13	51K886	STUD	4		CHF 24.70
15	GHF334	WASHER SPRING 7/16	4		CHF 1.65
16	GHF203	NUT 7/16 UNF	4		CHF 0.75
17	CHM163	BEARING DIFFERENTIAL CARRIER	2		CHF 41.80
18	2K7993	SHIM B/AXLE .002	a/r		CHF 5.75
18	ATB7239	SHIM B/AXLE .003	a/r		CHF 5.00
18	1G7600	SHIM B/AXLE .010	a/r		CHF 4.55
19	BTB328	DIFF CAGE BANJO AXLE	1		availability request
20	BTB150	DIFFERENTIAL WHEEL 25 SPLINE	2	from Chassis no. 2371	CHF 182.30
21	ATB7072	THRUST 35THOU STD	2		CHF 8.45
22	ATB7123	PLANET GEAR MGB	2		CHF 135.80
23	1G7445	THRUST WASHER DIFF	2		CHF 10.10
24	1G7444	PINION X PIN MGB DIFF	1		CHF 64.15
27	ATA7043	BOLT-CROWN WHEEL	8		CHF 14.85
28	6K875	LOCKTAB MGA CROWN WHEEL & PINION	4		CHF 6.00
29	ATB7064	THRUST 0.126	a/r		CHF 63.25
29	ATB7065	THRUST 0.124	a/r		CHF 63.10
29	ATB7066	THRUST 0.122	a/r		CHF 61.95
29	ATB7067	THRUST 0.120	a/r		CHF 65.85
29	ATB7068	THRUST 0.118	a/r		CHF 60.50
29	ATB7069	THRUST 0.116	a/r		CHF 64.25
29	ATB7070	THRUST WASHER .114	a/r		CHF 52.05
29	ATB7071	THRUST 0.112	a/r		CHF 58.35
30	100897A	PINION BEARING, INNER	1		CHF 60.00
31	1B7240	SPACER DIFF PIN BRG	1		CHF 86.95
32	2A7213	NTN BEARING PINION OUTER	1		CHF 39.75
33	ATB7102	SHIM 0.004	a/r		CHF 4.00
33	ATB7103	SHIM 0.006	a/r		CHF 7.85
33	ATB7106	SHIM 0.012	a/r		CHF 4.30
33	ATB7107	SHIM 0.020	a/r		CHF 4.10
33	ATB7108	SHIM 0.030	a/r		CHF 4.35
34	88G320	SEAL DIFF NOSE BANJO	1		CHF 7.05
40	ATB7258	BOLT NCA	8		availability request
41	GHF202	NUT PLAIN 3/8 UNF	8		CHF 0.60
42	GHF333	WASHER SPRING 3/8	8		CHF 0.95
45	ATB7248	STUD NCA	8		availability request
46	ATB7249	STUD NCA	8		availability request
47	ATB7255	MGATC & DELUXE REAR AXLE FLANGE GASKET	2		availability request
48	ATB7206	HALF SHAFT WIRE WHL MGA 10 SPLINE (FOR ORIG WIRE	2		CHF 216.20
48	ATB7386	1/2 SHAFT WW1600 26SP	2		availability request
48	BTB153	HALF SHAFT AXLE, WIRE WHEELS	2		CHF 180.80
50	2K8160	CORE PLUG 1-5/16DISH	2		CHF 3.80
51	GHF244	NUT 7/16UNF PHILIDAS	8		CHF 5.80
52	GHS211	OIL SEAL MGA/B BANJO	2		CHF 7.25
53	GHB127	BEARING REAR A&B BANJO	2		CHF 35.45
54	88G283	CROWNWHEEL & PINION 4.3:1	1		CHF 801.90