OIL SYSTEM

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	ARO9807	OIL COOLER 10 ROW	1		CHF 114.20

Ill.no.	Partno.	Part	Quantity required	Info	Price
2	AHH5902	GASKET O/C RAD	1		CHF 13.45

Ill.no.	Partno.	Part	Quantity required	Info	Price
3	SH604051	SCREW 1/4" UNF X 5/8"	4		CHF 0.95

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

Ill.no.	Partno.	Part	Quantity required	Info	Price
5	GHF221	NUT 1/4 UNF NYLOC	4		CHF 1.05

Ill.no.	Partno.	Part	Quantity required	Info	Price
6	AHH6296	HOSE - OIL COOLER	2		CHF 44.15

Ill.no.	Partno.	Part	Quantity required	Info	Price
11	AEH310	OIL FEED PIPE	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
12	AEH313	BANJO ADAPTOR	1		CHF 104.35

Ill.no.	Partno.	Part	Quantity required	Info	Price
13	AEH602	BANJO BOLT	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
14	6K500	CRUSH WASHER 1/2 ID	4		CHF 4.55

Ill.no.	Partno.	Part	Quantity required	Info	Price
15	7H1948	SEAL 1/2 ID X 23/32 OD X 3/32 SQ	1		CHF 1.65

Ill.no.	Partno.	Part	Quantity required	Info	Price
16	7H1965	FILTER BOLT NCA	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
17	7H1764	SPRING OIL FILTER	1		CHF 16.15

Ill.no.	Partno.	Part	Quantity required	Info	Price
18	7H1969	WASHER OIL FILTER CAN	1		CHF 2.55

Ill.no.	Partno.	Part	Quantity required	Info	Price
19	2K5820	FELT WASHER 3/8	1		CHF 1.10

Ill.no.	Partno.	Part	Quantity required	Info	Price
20	17H846	PLATE TECALAMET	1		CHF 34.50

Ill.no.	Partno.	Part	Quantity required	Info	Price
21	1K372	CIRCLIP	1		CHF 1.70

Ill.no.	Partno.	Part	Quantity required	Info	Price
22	8G683	FILTER OIL FELT	1		CHF 17.95
22	GFE102	ELEMENT, OIL FILTER, PAPER	1		CHF 11.20

Ill.no.	Partno.	Part	Quantity required	Info	Price
23	8G619	O RING O/FILTER MOUNTING	1		CHF 2.40

Ill.no.	Partno.	Part	Quantity required	Info	Price
24	8G619	O RING O/FILTER MOUNTING	1		CHF 2.40

Ill.no.	Partno.	Part	Quantity required	Info	Price
25	1H922	UNION OIL FEED	1		CHF 60.05

Ill.no.	Partno.	Part	Quantity required	Info	Price
26	6K501	COPPER WASHER 3/4 ID	1		CHF 1.65

Ill.no.	Partno.	Part	Quantity required	Info	Price
27	AEH598	OIL PIPE	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
28	1K2142	SCREW	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
29	1H898	COPPER WASHER 3/4 ID NCA	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
30	6K501	COPPER WASHER 3/4 ID	1		CHF 1.65

Ill.no.	Partno.	Part	Quantity required	Info	Price
40	88G296	OILPUMP 3 BRG MGB & MGA	1		CHF 115.45

Ill.no.	Partno.	Part	Quantity required	Info	Price
41	GHF101	SCREW 1/4 UNF X 1IN	1		CHF 0.80

Ill.no.	Partno.	Part	Quantity required	Info	Price
42	SH604141	SCREW 1/4" UNF X 1 3/4"	1		CHF 1.10

Ill.no.	Partno.	Part	Quantity required	Info	Price
43	GHF331	WASHER SPRING 1/4	2		CHF 0.55

Ill.no.	Partno.	Part	Quantity required	Info	Price
44	88G420	PUMP GASKET-3 BRG	1		CHF 3.10

Ill.no.	Partno.	Part	Quantity required	Info	Price
45	AEH460	THRUST O/PUMP MGA TC	1		CHF 65.35

Ill.no.	Partno.	Part	Quantity required	Info	Price
46	JAM2227	OIL STRAINER 5 INCH	1		CHF 56.00

Ill.no.	Partno.	Part	Quantity required	Info	Price
47	88G421	GASKET OIL STRAINER	1		CHF 1.30

Ill.no.	Partno.	Part	Quantity required	Info	Price
48	SH604071	SCREW 1/4" UNF X 7/8"	3		CHF 2.05

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

Ill.no.	Partno.	Part	Quantity required	Info	Price
50	AEH601	OIL PUMP STUD	3		CHF 32.70

Ill.no.	Partno.	Part	Quantity required	Info	Price
51	GHF301	WASHER 5/16 X 5/8 M8	3		CHF 0.40

Ill.no.	Partno.	Part	Quantity required	Info	Price
52	GHF332	WASHER SPRING 5/16	3		CHF 1.10

Ill.no.	Partno.	Part	Quantity required	Info	Price
53	GHF201	NUT 5/16 UNF	3		CHF 0.75

Ill.no.	Partno.	Part	Quantity required	Info	Price
54	AEH620	SPINDLE OIL PUMP 11 TOOTH MGA	1		availability request

Ill.no.	Partno.	Part	Quantity required	Info	Price
55	12H865	VALVE OIL PRESSURE RELIEF	1		CHF 12.55

Ill.no.	Partno.	Part	Quantity required	Info	Price
56	1H756	SPRING OPR VALVE	1		CHF 5.25

Ill.no.	Partno.	Part	Quantity required	Info	Price
57	12A1851	BLANKING PLUG	1		CHF 18.30

Ill.no.	Partno.	Part	Quantity required	Info	Price
58	6K431B	CRUSH WASHER 3/4IN	2		CHF 3.25

Ill.no.	Partno.	Part	Quantity required	Price
1	ARO9807	OIL COOLER 10 ROW	1	CHF 114.20
2	AHH5902	GASKET O/C RAD	1	CHF 13.45
3	SH604051	SCREW 1/4" UNF X 5/8"	4	CHF 0.95
4	GHF300	WASHER 1/4 X 1/2 OD	4	CHF 0.45
5	GHF221	NUT 1/4 UNF NYLOC	4	CHF 1.05
6	AHH6296	HOSE - OIL COOLER	2	CHF 44.15
11	AEH310	OIL FEED PIPE	1	availability request
12	AEH313	BANJO ADAPTOR	1	CHF 104.35
13	AEH602	BANJO BOLT	1	availability request
14	6K500	CRUSH WASHER 1/2 ID	4	CHF 4.55
15	7H1948	SEAL 1/2 ID X 23/32 OD X 3/32 SQ	1	CHF 1.65
16	7H1965	FILTER BOLT NCA	1	availability request
17	7H1764	SPRING OIL FILTER	1	CHF 16.15
18	7H1969	WASHER OIL FILTER CAN	1	CHF 2.55
19	2K5820	FELT WASHER 3/8	1	CHF 1.10
20	17H846	PLATE TECALAMET	1	CHF 34.50
21	1K372	CIRCLIP	1	CHF 1.70
22	8G683	FILTER OIL FELT	1	CHF 17.95
22	GFE102	ELEMENT, OIL FILTER, PAPER	1	CHF 11.20
23	8G619	O RING O/FILTER MOUNTING	1	CHF 2.40
24	8G619	O RING O/FILTER MOUNTING	1	CHF 2.40
25	1H922	UNION OIL FEED	1	CHF 60.05
26	6K501	COPPER WASHER 3/4 ID	1	CHF 1.65
27	AEH598	OIL PIPE	1	availability request
28	1K2142	SCREW	1	availability request
29	1H898	COPPER WASHER 3/4 ID NCA	1	availability request
30	6K501	COPPER WASHER 3/4 ID	1	CHF 1.65
40	88G296	OILPUMP 3 BRG MGB & MGA	1	CHF 115.45
41	GHF101	SCREW 1/4 UNF X 1IN	1	CHF 0.80
42	SH604141	SCREW 1/4" UNF X 1 3/4"	1	CHF 1.10
43	GHF331	WASHER SPRING 1/4	2	CHF 0.55
44	88G420	PUMP GASKET-3 BRG	1	CHF 3.10
45	AEH460	THRUST O/PUMP MGA TC	1	CHF 65.35
46	JAM2227	OIL STRAINER 5 INCH	1	CHF 56.00
47	88G421	GASKET OIL STRAINER	1	CHF 1.30
48	SH604071	SCREW 1/4" UNF X 7/8"	3	CHF 2.05
49	GHF331	WASHER SPRING 1/4	3	CHF 0.55
50	AEH601	OIL PUMP STUD	3	CHF 32.70
51	GHF301	WASHER 5/16 X 5/8 M8	3	CHF 0.40
52	GHF332	WASHER SPRING 5/16	3	CHF 1.10
53	GHF201	NUT 5/16 UNF	3	CHF 0.75
54	AEH620	SPINDLE OIL PUMP 11 TOOTH MGA	1	availability request
55	12H865	VALVE OIL PRESSURE RELIEF	1	CHF 12.55
56	1H756	SPRING OPR VALVE	1	CHF 5.25
57	12A1851	BLANKING PLUG	1	CHF 18.30
58	6K431B	CRUSH WASHER 3/4IN	2	CHF 3.25