THERMOSTAT & WATER PIPES

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	2K8982	PLUG NCA	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
3	232043A	COPPER WASHER 13/16X5/8	1		CHF 2.45

Ill.no.	Partno.	Part	Quantity required	Info	Price
4	AEH468	GASKET	1		CHF 1.40

Ill.no.	Partno.	Part	Quantity required	Info	Price
5	GHF103	SCREW 5/16 UNF X 1IN	2		CHF 2.20

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

Ill.no.	Partno.	Part	Quantity required	Info	Price
7	GHF332	WASHER SPRING 5/16	2		CHF 1.10

Ill.no.	Partno.	Part	Quantity required	Info	Price
8	GHF163	SCREW 5/16 UNC X 1IN	1		CHF 1.25

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

Ill.no.	Partno.	Part	Quantity required	Info	Price
10	GHF332	WASHER SPRING 5/16	1		CHF 1.10

Ill.no.	Partno.	Part	Quantity required	Info	Price
11	AEH631	ELBOW INLET	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
12	AEH423	GASKET	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
13	BH505141	BOLT 5/16UNCX1 3/4	2		CHF 2.85

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

Ill.no.	Partno.	Part	Quantity required	Info	Price
15	GHF332	WASHER SPRING 5/16	2		CHF 1.10

Ill.no.	Partno.	Part	Quantity required	Info	Price
16	AEH630	HOSE, WATER	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
17	GRH392	HOSE RADIATOR BOTTOM GREEN	1		CHF 17.45
17	GRH392X	HOSE RADIATOR BOTTOM, STRAIGHT, GREEN, SILICONE	1		CHF 7.65

Ill.no.	Partno.	Part	Quantity required	Info	Price
18	CS4029	WIRECLIP 1.625-1.8125 IN	4		CHF 3.10

Ill.no.	Partno.	Part	Quantity required	Info	Price
19	AEH393	PIPE OUTLET	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
20	AEJ4	COPPER WASHER - SEALING	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
21	GTS102	THERMOSTAT 74° C/165°F, NO BYPASS	1		CHF 11.05

Ill.no.	Partno.	Part	Quantity required	Info	Price
22	AEH477	THERMOSTAT HOUSING	1		CHF 461.55
NI	AEH477/K	THERMOSTAT HOUSING KIT	1	Includes 22, 23 & 24	CHF 411.85

Ill.no.	Partno.	Part	Quantity required	Info	Price
23	AEH479	COVER	1		CHF 217.95

Ill.no.	Partno.	Part	Quantity required	Info	Price
24	AEH478	GASKET THERMOSTAT MGA T/C	1		CHF 1.65

Ill.no.	Partno.	Part	Quantity required	Info	Price
25	BH504141	BOLT 1/4UNCX1 3/4	1		CHF 1.90

Ill.no.	Partno.	Part	Quantity required	Info	Price
26	SH504071	SCREW 1/4" UNC X 7/8"	2		CHF 1.40

Ill.no.	Partno.	Part	Quantity required	Info	Price
27	GHF300	WASHER 1/4 X 1/2 OD	3		CHF 0.45

Ill.no.	Partno.	Part	Quantity required	Info	Price
28	GHF331	WASHER SPRING 1/4	3		CHF 0.55

Ill.no.	Partno.	Part	Quantity required	Info	Price
29	GHF103	SCREW 5/16 UNF X 1IN	2		CHF 2.20

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

Ill.no.	Partno.	Part	Quantity required	Info	Price
31	GHF332	WASHER SPRING 5/16	2		CHF 1.10

Ill.no.	Partno.	Part	Quantity required	Info	Price
32	GHF201	NUT 5/16 UNF	2		CHF 0.75

Ill.no.	Partno.	Part	Quantity required	Info	Price
33	GRH392	HOSE RADIATOR BOTTOM GREEN	1		CHF 17.45

Ill.no.	Partno.	Part	Quantity required	Info	Price
34	CS4029	WIRECLIP 1.625-1.8125 IN	2		CHF 3.10

Ill.no.	Partno.	Part	Quantity required	Info	Price
35	ADP610	PLUG	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
36	AEK123	WASHER FIBRE 3/8 BSP	1		CHF 1.00

Ill.no.	Partno.	Part	Quantity required	Info	Price
37	AEH483	ADAPTOR, BYPASS	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
38	AEH491	BYPASS PIPE	1		CHF 87.80

Ill.no.	Partno.	Part	Quantity required	Info	Price
39	AEH493	HOSE WATER PUMP TO STAT	1		CHF 24.70

Ill.no.	Partno.	Part	Quantity required	Info	Price
40	AEH494	HOSE	1		CHF 29.65

Ill.no.	Partno.	Part	Quantity required	Info	Price
41	GHC11020	HOSE CLIP 13-20MM	2		CHF 5.75

Ill.no.	Partno.	Part	Quantity required	Info	Price
42	GHC11020	HOSE CLIP 13-20MM	2		CHF 5.75

Ill.no.	Partno.	Part	Quantity required	Info	Price
43	PCR1009	P CLIP, 5/8" CABLE DIAMETER X 9/32"	1		CHF 3.05

Ill.no.	Partno.	Part	Quantity required	Info	Price
44	AEH492	BRACKET FOR CLIP MGA	1		CHF 17.65

Ill.no.	Partno.	Part	Quantity required	Info	Price
45	SH604041	SCREW 1/4" UNF X 1/2"	1		CHF 0.75

Ill.no.	Partno.	Part	Quantity required	Info	Price
46	GHF331	WASHER SPRING 1/4	1		CHF 0.55

Ill.no.	Partno.	Part	Quantity required	Info	Price
47	GHF200	NUT 1/4 UNF	1		CHF 0.60

Ill.no.	Partno.	Part	Quantity required	Info	Price
2	2K8982	PLUG NCA	1		availability request
3	232043A	COPPER WASHER 13/16X5/8	1		CHF 2.45
4	AEH468	GASKET	1		CHF 1.40
5	GHF103	SCREW 5/16 UNF X 1IN	2		CHF 2.20
6	GHF301	WASHER 5/16 X 5/8 M8	2		CHF 0.40
7	GHF332	WASHER SPRING 5/16	2		CHF 1.10
8	GHF163	SCREW 5/16 UNC X 1IN	1		CHF 1.25
9	GHF301	WASHER 5/16 X 5/8 M8	1		CHF 0.40
10	GHF332	WASHER SPRING 5/16	1		CHF 1.10
11	AEH631	ELBOW INLET	1		availability request
12	AEH423	GASKET	1		availability request
13	BH505141	BOLT 5/16UNCX1 3/4	2		CHF 2.85
14	GHF301	WASHER 5/16 X 5/8 M8	2		CHF 0.40
15	GHF332	WASHER SPRING 5/16	2		CHF 1.10
16	AEH630	HOSE, WATER	1		availability request
17	GRH392	HOSE RADIATOR BOTTOM GREEN	1		CHF 17.45
17	GRH392X	HOSE RADIATOR BOTTOM, STRAIGHT, GREEN, SILICONE	1		CHF 7.65
18	CS4029	WIRECLIP 1.625-1.8125 IN	4		CHF 3.10
19	AEH393	PIPE OUTLET	1		availability request
20	AEJ4	COPPER WASHER - SEALING	1		availability request
21	GTS102	THERMOSTAT 74° C/165°F, NO BYPASS	1		CHF 11.05
22	AEH477	THERMOSTAT HOUSING	1		CHF 461.55
NI	AEH477/K	THERMOSTAT HOUSING KIT	1	Includes 22, 23 & 24	CHF 411.85
23	AEH479	COVER	1		CHF 217.95
24	AEH478	GASKET THERMOSTAT MGA T/C	1		CHF 1.65
25	BH504141	BOLT 1/4UNCX1 3/4	1		CHF 1.90
26	SH504071	SCREW 1/4" UNC X 7/8"	2		CHF 1.40
27	GHF300	WASHER 1/4 X 1/2 OD	3		CHF 0.45
28	GHF331	WASHER SPRING 1/4	3		CHF 0.55
29	GHF103	SCREW 5/16 UNF X 1IN	2		CHF 2.20
30	GHF301	WASHER 5/16 X 5/8 M8	2		CHF 0.40
31	GHF332	WASHER SPRING 5/16	2		CHF 1.10
32	GHF201	NUT 5/16 UNF	2		CHF 0.75
33	GRH392	HOSE RADIATOR BOTTOM GREEN	1		CHF 17.45
34	CS4029	WIRECLIP 1.625-1.8125 IN	2		CHF 3.10
35	ADP610	PLUG	1		availability request
36	AEK123	WASHER FIBRE 3/8 BSP	1		CHF 1.00
37	AEH483	ADAPTOR, BYPASS	1		availability request
38	AEH491	BYPASS PIPE	1		CHF 87.80
39	AEH493	HOSE WATER PUMP TO STAT	1		CHF 24.70
40	AEH494	HOSE	1		CHF 29.65
41	GHC11020	HOSE CLIP 13-20MM	2		CHF 5.75
42	GHC11020	HOSE CLIP 13-20MM	2		CHF 5.75
43	PCR1009	P CLIP, 5/8" CABLE DIAMETER X 9/32"	1		CHF 3.05
44	AEH492	BRACKET FOR CLIP MGA	1		CHF 17.65
45	SH604041	SCREW 1/4" UNF X 1/2"	1		CHF 0.75
46	GHF331	WASHER SPRING 1/4	1		CHF 0.55
47	GHF200	NUT 1/4 UNF	1		CHF 0.60