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B.M.C, M.G, & Morris Engine Codes. This list cover the 1936 Morris engines, and the 1952 to 1990 BMC/BMH/BL/Austin Rover 'A', 'B', and 'C' series engines you will find in the companies cars. I
t is intended to help identification of an engine. 1936 to 1956. Consists of four letters, followed by the engines number. (1)MODEL (2)Valves (3)Bore & H.P. (4)Make. U Morris 8 S Sidevalve H 57mm 8HP M Morris M Morris 10/4 P OHV J 63.5mm 10HP G M.G. X late Morris 10/4 C OHC A 66.5mm 11HP W Wolseley T Morris 12/4 B 69.5mm 12HP C Commercial Q 2ltr 6 cyl E 72mm 13HP O 3 1/2 ltr 6cyl D 75mm 14HP A Austin A30 D 61.5mm 6cyl H 69mm 6cyl ie; XPAG 1250cc MG TB OHV engine 11HP. XPJM 1140cc Morris 10/4 ohv engine 10HP. XPJW 1140cc Wolseley 10/40 ohv engine 10HP. USHM 918cc Morris Minor MM SV engine 8HP. XPEG 1488cc MG TF OHV engine 13HP. MPJG 1292cc MG TA engine ohv 12HP. MPJM 1292cc Morris 12/4 OHV engine 10HP. MPJW 1292cc Wolseley 12/48 OHV engine 10HP. APHM 803cc Morris Minor MM OHV engine, 8HP. ( first 'A' series.) APJM 948cc Morris Minor 1000 OHV engine 10HP. TPBG 1549cc MG VA ohv engine 12HP. TPDG 1705cc MG 'Cream Cracker' TA engine. QPJG 2322cc MG WA ohv engine 18HP. QPHW 2561cc Wolseley 18/80 ohv engine 18HP. BMC 'B' Series, 1947 to 1981.( First real 'B' series was in 1953.) With the arrival of Austin based 'A' & 'B' series amongst those used, a system of engine 'cc' was added. It basically followed the post 1956 system, but put 'BP' infront to denote 'B' series, 'P'ush rod ohv.The first car to use the 'B' series was the M.G. Magnette ZA, in 1489cc form, in 1953. The earlier Austin A40 Devon 1200cc unit was that developed into this later 1489cc and 1200cc 'B'. ie. BP15M was a 1489cc Morris Oxford. BP15GA was the ZA Magnette of 1489cc. BP15GC an improved ZA Magnette, with full flow oil filter. BP15GB was the first MGA 1489cc engine, BP 15GD followed it. BC16GB was the MGA Twin Cam, 'B' series, 'C' camshaft. 1956 to 1970 'A', 'B', and 'C' Series engine Prefix. The 'BP' prefix was dropped once BMC had its three engine types, A, B, and C. Again, there is a prefix, consisting of a number, then letter/letter/letter, then the engine number. Cubic capacity Make Type Ancillaries Compression 8 803cc B BMC Industrial A to Z A automatic H high comp 9 948cc G M.G. ,, M manumatic clutch L low comp 10 1098cc A Austin ,, P police spec. 12 1200cc W Wolseley ,, U central gear change 12 1275cc H miscellaneous ,, N column change 15 1489cc J Commercial ,, O overdrive 16 1588cc V Van den Plas ,, 16 1622cc M Morris ,, 18 1798cc R Riley ,, 22 2200cc 25 2500cc 26 2600cc 29 2912cc ie, 15W / U / H 1234 1489cc Wolseley 15/50, central gear change, high comp. 15GE / U / H 1234 1489cc M.G. Magnette Mk3, central gearchange, high comp. 16AMW / U / H 1234 1622cc Austin, Morris & Wolseley Farina, central gear, high c. 16GA / U / H 1234 1588cc MGA 1600,central gear change, high comp. 15AC / N / L 1234 1489cc Austin 15cwt van, column change, low comp. 18GA / O / H 1234 1798cc MGB 3 main B. with overdrive, high comp. 29WA / O / H 1234 2912cc Wolseley 6/110, overdrive, high comp. 29GA / A / H 1234 2912cc MGC GT, automatic, high comp. 1970 onwards. After 1970 the system was again changed, and simple types were just numbered. 85 848cc 99 998cc 10 1098cc 12 1275cc 16 1622cc 18 1798cc 22 2200cc with either a 'V' or an 'H' after it. 16V meant vertical,( in-line), as in the Sherpa van, or 18V as in both the later Sherpa and MGB, and Morris Marina 1800. 12V would be in an Ital, and 12H in Metro, H meaning horizontal, (FWD.) It was the group of numbers/letters after that denoted the fitment, ie, 18V-584F for a UK specification engine on the MGB. 18H was in the FWD 1800. As an aside, the big BMC 6 cylinder 'C' series was a Morris Engines design, where as the 'A' & 'B' were Austin designed. ************ BMC 'B' SERIES ENGINES USE.( 1953 to 1981.) Model cc Prefix BHP/RPM Torque Austin A40 Devon 1200 BP12M 40/4500 58lb/ft Austin A40 Somerset 1200 BP12M 42/4500 58 Austin A40 Sports 1200 BP12M 42/4500 58 Austin A40 Sports 1200 BP12M 46/4500 58 Austin A40 Cambridge 1200 BP12M 42/4500 58 Morris Cowely series 1 1200 BP12M 40/4500 58 Austin Metropolitan 1200 1200 BP12M 42/4500 58 Austin Metropolitan 1500 1489 BP15M 52/4500 70 Nash Metrpolitan 1500 1489 15F ( USA only) 52/4500 70 Massey Harris combined harvester 1200 1HLC 40/4500 50 Morris Oxford series 2 1489 BP15MH 50/4500 70 Morris Oxford series 2 1489 BP15ML 45/4500 65 (LC) Morris Cowely series 2 1489 BP15M 50/4500 70 Morris Oxford series 3 1489 15M 55/4500 72 Morris Oxford series 4 1489 15M 55/4500 72 Wolseley 15/50 1489 BP15W 50/4500 70 Wolseley 15/50 1489 15AMW 55/4500 72 Wolseley 1500 Mk1 1489 BP15LAW 50/4500 70 Wolseley 1500 Mk2 1489 15W, 15WA 55/4500 72 Riley 1.5 Mk1 1489 15R, 15RA 60/4800 77 Riley 1.5 Mk2 1489 15RB 66/5200 82 M.G. Magnette ZA 1489 BP15GA 60/4800 77 M.G. Magnette ZA & ZB 1489 BP15GC,15GC 68/5200 82 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 Austin/Morris 1/2ton, ) 1489 BP15ML, ) van,pick up, ) 15AC, VS15C ) 50/4200 74 (LC) Diesel Engine 1489 BP15J,15Y,15J,15Z 40/4200 90 Austin A50 Cambridge 1489 1H 50/4500 70 Austin A55 Cambridge 1489 15 55/4500 72 Austin A55 Mk2 Camb. 1489 15AMW 55/4500 82 Morris Oxford series 5 1489 15AMW 55/4500 82 Wolseley 15/60 1489 15AMW 55/4500 82 Riley 4/68 1489 15RA, 15RB, 68/5200 85 M.G. Magnette Mk3 1489 15GE 66/5200 85 Morris Oxford series 6 1622 16AMW, 16AA 61/4500 90 Austin A60 Cambridge 1622 16AMW, 16AA 61/4500 90 Wolseley 16/60 1622 16AMW,16AA 61/4500 90 M.G. Magnette Mk4 1622 16GE, 16GF 68/5200 89 Riley 4/72 1622 16RA,16GF 72/5500 90 M.G. MGA 1600 Mk2 1622 16GC 90/5500 97 A60 commercials 1622 16AC,16AE 61/4500 90 Farinas with alternators, 1622 16C (1971 only) 61/4500 90 BMC 1/2 ton van 1622 16AD 61/4500 90 Sherpa van 1622 16V 58/4500 82 (LC) Sherpa van 1798 18V 80/5000 85 (LC) Morris Marina 1800 1798 18V 85/5000 90 Morris Marina 1800TC 1798 18V 95/5400 110 Austin 1800 Mk1 1798 18C,18AMW 80/5000 90 Morris 1800 Mk1 1798 18C,18AMW 80/5000 90 Wolseley 18/85 1798 18C,18AMW 80/5000 90 all 1800 Mk2 1789 18C 86/5300 92 all 1800 Mk3 1798 18H 86/5300 95 Austin 1800S 1798 18H 96/5400 106 M.G. MGB (3 mainbearings) 1798 18G,18GA 95/5400 110 M.G. MGB* (5 mainbearings) 1798 18GB,18GD,18GG, 18GH,18GF,18GJ, 18GK, & 18V 95/5400 110 (power down to 84bhp by 1975 for USA.) Hundustani 1489 ? 50/4200 74 Navigator Marine 1489 ? 42/4200 60 Navigator Marine 1622 ? 58/4500 85 Differing compresion ratios gave different BHP/Torque figures. (LC) indicates low comp, usually about 7.2 to 1, the normal, or high comp, was usually 8.3 to 1. Later cars such as the MGA & MGB ran with 9 to 1 and 9.5 to 1, as did some 1800 fwd cars. An 'H' or 'L' in the number is usually a clue to the ratio, though a simple change of pistons will change the ratio if the 'dish' differs in the crown. 48G is a 'B' series Gold Seal recon unit. The 'A' series was 8G, and the 'C' series 68G. ( ** All pre-1956 reconditioned engines were prefixed 8G, only when the Gold Seal Exchange engine arrived, was there any difference.) The MGB used the 1800 for a long time, so there were codes to denote the differences between the engines, peculiar to MG;- prefix bearings model market dates if known 18G 3 Mk1 GHN3/D3 all Oct 1962/April64 18GA 3 Mk1 GHN3/D3 all April 1964/Oct64 18GB 5 Mk1 GHN3/D3 all Oct1964/67 18GD 5 Mk2 GHN4/D4 UK/Europe Oct1967/69 18GF 5 Mk2 GHN4/D4 USA Oct1967/69 18GG 5 Mk2 GHN5/D5 UK/Europe Oct1969/71 18GH * 5 Mk2 GHN5/D5 Europe Oct1969/70 18GJ 5 Mk2 GHN5/D5 USA Oct1969/70 18GK 5 Mk2 GHN5/D5 USA Oct1970/71 18V** 5 Mk3 GHN5/D5 see below Oct 1971 onwards. * After 18GH there were extra letters after the prefix, 'U' still meant central gearchange; 'RU' now meant overdrive; 'We' all synchromesh gearbox; 'RWe' all synchro with overdrive; 'Rc' automatic gearbox. ** 18V was followed with a code for the market, such as if a 'Y' appears in the prefix, it is a Europe spec car; if a 'F' a UK spec car; if a 'Z' a north America spec car. An 'AE' after 1975 is a car with a catylist fitted for California. The emmission controls, timing changes, etc, require a workshop manual to identify the huge numbers of changes. ****************** BMC 'A' Series Engines. ( 1952 to 1999) Just like the 'B' series, BMC used the same system as above to denote the use of the engine. Car Model Engine cc Prefix number . Austin A30 803cc 2A Austin A35 948cc 9A Austin A35 van ( optional) 848cc 8G ( post 1962 all GPO.) Austin A40 Mk1 948cc 9A or 9D Austin A40 Mk2 948cc 9DB Austin A40 Mk2 1100 1098cc 10D or 10DD Austin Healey Sprite Mk1 948cc 9CG or 9CC Sprite Mk2/ MG Midget Mk1 1098cc 10CG Sprite Mk3/ MG Midget Mk2 1098cc 10CC ( 2" main bearings.) Sprite Mk4/ MG Midget Mk3 1275cc 12CC or 12CE home market .. .. .. 12CD or 12CJ N. America .. .. .. after Oct '72, 12V/586F/H home market .. .. .. .. 12V/671Z/L N. America Austin Allegro 1275cc 12H/A ( same as Metro) Austin Mini 848cc 8A Morris Mini 848cc 8MB Austin & Morris Mini after 1962, 848cc 8AM Austin/Morris Mini automatic 848cc 8AH Mini Automatic closed circuit breather 848cc 8AK Mini floor change closed circuit breather 848cc 8AJ Mini GPO saloon & van 848cc 85H ( 1" restrictor in carb.) Mini Clubman 1098cc 10H Mini 1000 998cc 99H Mini 1000 unleaded high comp 998cc 99HE20 Mini 1000 unleaded low comp 998cc 99HE22 Mini 1000 Automatic 998cc 99HB82P Mini 1275cc 1275cc 12H Mini Moke 848cc 8AC 1275GT & Cooper Mk3 'S' 1275cc 12H Later Cooper models 1275cc 12A Wolseley Hornet, Riley Elf Mk1 848cc 8WR Wolseley Hornet, Riley Elf Mk2 998cc 9WR Austin, Morris, Wolseley fwd 1100 1098cc 10AMW, 10H .. .. .. .. 1098cc closed circuit breather 10AH Austin, Morris, Wolseley 1100 Automatic 1098cc 10AG .. .. .. .. 1098cc closed circuit breather, 10AJ MG 1100 Mk1 & Mk2, Riley 1100 1098cc 10GR MG & Riley 1100 closed circuit breathing 1098cc 1965 on 10GRB Vanden Plas 1100 1098cc 10GR, 10V MG 1300 Mk1 1275cc 12G ( single SU.) MG 1300 Mk2 , Riley 1300 1275cc after April '68 12GR All fwd 1300 Automatic 1275cc 12A Vanden Plas 1300 1275cc 12GR, 12V Austin 1300 'S' Mk1, Mk2 1275cc 12FA Austin 1300 'S' Mk3 1275cc 12H Austin Maestro/Montego 1.3 1275cc 12HA ( 'A' Plus) ( Uses Marina 1.3 type block.) Austin Metro 1 ltr 998cc 99HA ( all 'A' Plus) Metro 1 ltr1985 on 998cc 99HA, 99HB, 99HC, 99HD, 99HE, 99F. Metro 1300 HLE 1275cc 12HA08AA .. .. 1275cc 12HB, 12HC, 12HD, 12HE, 12HF. MG Metro 1300 leaded fuel pre 1989 1275cc 12H996AA, 12HD24 MG Metro 1300 unleaded post mid-1989 1275cc 12HF01 MG Metro Turbo leaded fuel pre 1989 1275cc 12HD26 MG Metro Turbo unleaded 1275cc 12HF01 Austin Metro Sport .. 1275cc 12HF02 Austin Metro GTa .. 1275cc 12HF02 Austin Metro's with unleaded engines, 1275cc 12HE24, 35, 39, 40, 41, 42, 67 up to 75. Morris Minor Series 2 803cc APHM Morris Minor 1000 series 3 948cc APJM Morris Minor 1000 series 4 after 1956 948cc 9M Morris Minor 1000 series 5 1098cc 10MA Morris Minor series 5, close circuit breather 1098cc 10ME Morris 1000 GPO van 948cc 8AG after 1962 Morris 1000 van, low compression 1098cc 10AB Morris 1000 van closed circuit breather 1098cc 10V Morris Marina 1300 1275cc 12V Specialist engines... Mini Cooper 997cc & 1070cc 'S' 9F/SA/H comp 9.1 Mini Cooper 997cc 9F/SA/L 8.3 Mini Cooper 970cc 'S' 9F/SA/X 10 Mini Cooper 1275cc 'S' 9F/SA/Y 9.75 Mini Cooper 998cc 9FA/SA/H 9.1 Mini Cooper 998cc 9FA/SA/L 8.3 Mini Cooper 970cc 'S' 9FC/SA/H 9.1 Mini Cooper 998cc 9FD/SA/H 9.1 Mini Cooper 1070cc 'S' 9FD/SA/H 9.1 (engine 33661 to 33948,) Mini Cooper 998cc 9FD/SA/L 8.3 Mini Cooper 970cc 'S' 9FD/SA/X 10 Mini Cooper 1275cc 'S' 9FD/SA/Y 9.75 Mini Cooper 970cc 'S' 9FE/SA/X 10 Mini Cooper 1275cc 'S' 9FE/SA/Y 9.75 Mini Cooper 1070cc 'S' 10F 8.3 Still being fitted to the 1275cc Mini as 12HE...................( 1999) Neil Cairns, MG Engine Information Service < neil.cairns@virgin.net > ********************* ( Not a complete list yet.) BMC 'C' SERIES Engines. 1954 Morris Isis, 2693cc C26M 85bhp 1954 Wolseley 6/90 2693cc 26W 95 1954 Austin A90 Zenith carb 2693cc 26A 83 1956 Riley 2.6 2693cc 26R 95 1956 Austin A105 2693cc 26A 102 1956 Austin Vanden Plas A105 2693cc 26A 102 1956 Austin A95 Westminster 2693cc 26A 92 1956 Austin Healey 100/6 2693cc 26A 102 1959 Austin Healey 3000 Mk1 2912cc 29A 124 1961 Austin Healey 3000 Mk2 2912cc 29A 132 1963 Austin Healey 3000 Mk3 2912cc 29A 150 1959 Austin Westminister A99 2912cc 29A 103 1959 Wolseley 6/99 2912cc 29WA 103 1959 Vanden Plas Princess Mk1 2912cc 29VA 103 1961 Austin Westminister A110 Mk1 & Mk2 2912cc 29A 120 1961 Wolseley 6/110 Mk1 & Mk2 2912cc 29WB 120 1961 Vanden Plas Princess Mk2 2912cc 29VB 120 1967 Austin 3 Litre ( 7 main bearings,) 2912cc 29AA 124 1967 MG MGC ( ,, ,, ) 2912cc 29GA 145 The Austin models used Zenith carbs up to the farina Westminster in 1959, then they had SU's as all the others used all along. Healeys had different cylinderheads, separate manifolding, and camshafts. ****************** GOLD SEAL EXCHANGE ENGINES. BMC like many firms did an exchange scheme for worn engines, one was the Gold Seal engine, a complete engine ready to fit and painted gold in colour. The other was the Silver Seal exchange engine, basically a short-block for the owner/garage to fit the old head,sump, and ancillories onto. Both used a similar system of engine numbering, the original number being struck off. Initially all engines in the scheme were prefixed 8G, soon a better system followed:- 'A' series engines were prefixed 8G,- 803cc, 848cc, 948cc, 1098cc, 1275cc. 'B' series were prefixed 84G,- 1200cc, 1489cc, 1588cc, 1622cc, 1798cc. 'C' series were prefixed 86G,- 2693cc, 2912cc. The code after was to do with rebore/regrind sizes and a job number. *******************