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Inläggav branserud » 28 september 2009 kl. 08:12

http://home.versatel.nl/carclub.ij-v5/MG_&_Morris_Enginecode.pdf

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. It 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
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 >
*********************
BMC 'C' SERIES Engines.
( Not a complete list yet.)
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.
*******************
998 and 1098cc Engine Identification
The 998cc A Series engine first saw Mini use in the Riley Elf and Wolseley Hornet Mk II models, introduced in early 1963. By the end of 1963 they had been joined by the 998cc Mini Cooper, which replaced the 997cc Cooper after a short production overlap. 1967 saw the first use of a 998cc engine in a 'standard' Mini, the Mini Mk II 1000. This model, in both manual and automatic gearbox versions and a wide range of trim levels and names, continued in production right the way through to 1992. As with the 848cc engine, 998cc engines used with automatic gearboxes are different in several respects to those used with manual. The Mini Clubman and Clubman Estate shared the Mini 1000's power unit until 1975, after which date the manual Clubmans received the 1098cc A Series (automatics continued with 998cc, there being no automatic type 1098cc engine). When in 1980 the Clubman saloon was dropped, the Estate continued for a further two years, rebadged 'HL' and reverting to 998cc in manual versions.
For 1981 the 998cc A Series engine was relaunched in A Plus specification, in readiness for what was envisaged as a new and prosperous life in the Austin Metro (the Mini wasn't expected to last much longer by then!). The A Plus engine is most easily identified by the reinforcement ribs on the engine block casting; these ribs are missing on the much smoother casting of the pre-A Plus unit. However, just to confuse the issue, the A Plus components were actually introduced gradually between 1979 and 1981, which means that many 'hybrid' engines were built at that time. The Metro, overseas-built Mini Mokes and the very short-lived Allegro 3 are the only BMC/Leyland/Austin Rover vehicles to share the use of the 998cc engine with the Mini.

The 1098cc engine appeared in home market Minis for the first time in the aforementioned Clubman in 1975. The only other UK-built Mini to receive the engine was the Special (1100) of 1979, a limited edition celebrating the 20th anniversary of Mini production. The Special was heavily based on a similar Mini produced for several years in Belgium for mainland European markets, which also used the same engine. Through the 1970s and early 1980s Europe consistently made far more use of the 1098cc A Series in Minis than was the case in the UK.

In common with the 848 and 998cc A Series engines, the 1098cc unit received a pad type timing chain tensioner for 1979, with the tell-tale bulge on the timing cover. Not being destined for use in the forthcoming Austin Metro, the 1098cc engine was not scheduled for the full 1981 A Plus improvement scheme; certain A Plus parts still had to be used from the start of the 1980s however because they were shared with 998cc engine production. The most obvious - and biggest - example of this was the adoption of the A Plus ribbed cylinder block. The best known of other 1098cc A Series applications was without doubt the best-selling BMC ADO16 range (Austin/Morris 1100, MG 1100, etc.). It is very possible if your Mini has received a 1098cc upgrade that the engine started life in one of these cars, especially one of the very nice twin carburetter versions. The only other transverse applications of the engine were overseas-built Mokes (again) and more basic trim level Austin Allegros. Non-transverse applications were legion (Morris Minor, MG Midget, etc.) but are of no consequence here: the engines cannot be adapted to sit on a Mini Allegros. Non-transverse applications were legion (Morris Minor, MG Midget, etc.) but are of no consequence here: the engines cannot be adapted to sit on a Mini gearbox.

Engine serial number prefix codes are important in identifying what you have in your car and establishing which replacement parts to fit to it. The 998 and 1098cc engine number prefixes used on Mini engines are listed here for that reason. The engine serial number is stamped on a plate affixed to the cylinder head mating face or 'deck' of the cylinder block, at the front of the engine towards the right hand side, as you look at the engine in the car. Note that the last code letter before the serial number itself on pre-A Plus engines relates to the compression ratio of the engine: H for high compression, L for low compression.

A Plus high or low compression engines are by contrast identified by the letter plus two digits part of the engine serial number prefix, a full list of these is shown below.

Factory reconditioned engines always lost their serial numbers in favour of an engine number plate stamped with the appropriate part number for the intended application for each engine. In the absence of an engine serial number on a factory reconditioned unit, this is the only means of identification - but beware!

Factory reconditioned engines were more often than not built up with whatever suitable components were to hand; for example, new parts were usually plucked from the engine production line and were therefore of the latest design. Reused components came from stocks of parts which would do the same job, but were not necessarily the same design, all lumped together. In other words, parts used in the rebuild were frequently incorrect in a historic sense for the engine being rebuilt.


998cc Wolseley and Riley Engine Serial Number Prefix Codes 1963-67
9WR/ Manual gearbox (direct change) engines (1963-64)
9AD/ Manual gearbox (remote change) engines without closed circuit breathing (1964-67)
9AE/ Manual gearbox (remote change) engines with closed circuit breathing (1964-67)
9AG/ Automatic gearbox engines without closed circuit breathing (1966-67)
9AJ/ Automatic gearbox engines with closed circuit breathing (1966-67)

998cc Cooper Engine Serial Number Prefix Codes 1963-69
9FA/SA Manual gearbox (3 Synchro) engine without closed circuit breathing (1963-64)
9FD/SA Manual gearbox (3 Synchro) engine with closed circuit breathing (1964-68)
9FD/XE Manual gearbox (4 Synchro) engine with closed circuit breathing (1968-69)
99H/377CH Manual gearbox (4 Synchro) engine with closed circuit breathing and dynamo (1969)
99H/378CH Manual gearbox (4 Synchro) engine with closed circuit breathing and alternator (1969)

998cc Wolseley and Riley Engine Serial Number Prefix Codes 1967-69
998cc Austin and Morris Engine Serial Number Prefix Codes 1967-69
998cc Mini Engine Serial Number Prefix Codes 1969-92
1098cc Mini Engine Serial Number Prefix Codes 1975-81
99H/ 998cc engines (1967-92)
10H/ 1098cc engines (1975-81)

With the advent of 99H/ and 10H/ serial numbers, the codes became far more complex. 99H/ or 10H/ was followed by a three character code, either three digits (issued from 1967-81), or a letter and two digits (1982 onwards). There were not many variations in the Mini 1098cc engine and most have an engine number beginning 10H/791. Engines with A Plus features started to appear around 10H/791/180000, and the A Plus block was in use by 10H/791/217000.
Unfortunately there are too many combinations of 99H/ codes to list in the space available here, but if you contact Somerford Mini with your full engine number we can 'unpick' the codes to tell you exactly what specification your engine was built to. We can however give you two important developments later in the life of the 998cc engine denoted by the codes, which mostly ran chronologically in numerical (and from 1982 alpha-numerical) order: 99H/791/431856 Introduction of A Plus cylinder block (plus some engine numbers intermittently for a short period beforehand; 1980-90) 99H/997 Earliest code denoting complete A Plus specification engine (introduced 1980/81)

Additionally, it is helpful to know which A Plus 998cc engines are high (10.3:1) or low (8.3:1) compression ratio, and which are lead-free engines: High Compression Ratio: 99H/997, 998, A53, A94, A98, B81, B82, C20, D80, D82 Low Compression Ratio: 99H/A19, A97, A99, B83, B84, B85, D83 Lead-Free High Compression Ratio: 99H/D81, E20, E21, F15, F16, F32, G30, G32, G33, G34, G39 Lead-Free Low Compression Ratio: 99H/960, A99, E22, G31 BMC/Leyland/Unipart/Rover Mini 998cc Manual (not Cooper) Reconditioned Engine Part Numbers.


8G31 998cc Wolseley and Riley manual gearbox engine (1963-67; replaced by 8G51)
8G47 998cc Wolseley and Riley manual gearbox engine (1963-67; replaced by 8G51)
8G51 998cc Wolseley and Riley manual gearbox engine (1963-67)
8G56 998cc Austin, Morris, Wolseley and Riley manual gearbox engine (1967-69)
8G57 998cc Austin, Morris, Wolseley and Riley manual gearbox engine (1967-80)
GSE1102 998cc manual gearbox engine; later 'Gold Seal' part number. Specification as 8G57 (1967-80)
RKM1102 998cc manual gearbox engine; later 'Silver Seal' part number. Specification as 8G57 (1967-80)
RKM1119 998cc manual gearbox engine; later 'Silver Seal' part number. Specification as 8G57; replaced RKM1102 (1967-80)
8G63 998cc manual gearbox engine, Canada (1972-75)
BHM1061 998cc manual gearbox engine, Canada, Sweden and Japan (1975-80)
BHM1232 998cc A Plus manual gearbox engine, low compression (1980-85)
BHM1377 998cc A Plus manual gearbox engine, high compression (1980-85)
BHM1233 998cc A Plus manual gearbox engine, Japan (1980-85)
BHM1458 998cc A Plus manual gearbox engine, low compression (1985 on)
BHM1460 998cc A Plus manual gearbox engine, high compression (1985 on)
LBB10175 998cc A Plus manual gearbox engine, low compression, lead free (1988 on)
LBB10089 998cc A Plus manual gearbox engine, high compression, lead free (1988 on)

BMC/Leyland/Unipart Mini 998cc Manual (Cooper) Reconditioned Engine Part Numbers
8G33 998cc high compression, without closed circuit breathing, 12G206 cylinder head casting (1963)
8G34 998cc low compression, without closed circuit breathing, 12G206 cylinder head casting (1963)
8G40 998cc high compression, without closed circuit breathing, 12G295 cylinder head casting (1964)
8G39 998cc low compression, without closed circuit breathing, 12G295 cylinder head casting (1964)
8G42 998cc high compression, with closed circuit breathing, 12G295 cylinder head casting (1964)
8G43 998cc low compression, with closed circuit breathing, 12G295 cylinder head casting (1964)
8G49 998cc high compression, with closed circuit breathing, 12G295 cylinder head casting, warning light type oil filter head (1964-69)
8G48 998cc low compression, with closed circuit breathing, 12G295 cylinder head casting, warning light type oil filter head (1964-69)
GSE1103 998cc high compression engine; later 'Gold Seal' part number. Specification approximately as 8G49 (1964-69)
RKM1103 998cc high compression engine; later 'Silver Seal' part number. Specification approximately as 8G49 (1964-69)
RKM1120 998cc high compression engine; later 'Silver Seal' part number. Specification approximately as 8G49; replaced RKM1103 (1964-69)

BMC/Leyland/Unipart/Rover Mini 998cc Automatic Reconditioned Engine Part Numbers
8G58 998cc Austin, Morris, Wolseley and Riley automatic gearbox engine (1967-69)
8G59 998cc Austin, Morris, Wolseley and Riley automatic gearbox engine (1967-80)
BHM1041 998cc Austin and Morris automatic gearbox engine (1974-80)
BHM1235 998cc A Plus automatic gearbox engine, low compression (1980-85)
BHM1378 998cc A Plus automatic gearbox engine, high compression (1980-85)
BHM1461 998cc A Plus automatic gearbox engine, high compression (1985 on)
LBB10088 998cc A Plus automatic gearbox engine, high compression, lead free (1985 on)
LBB10176 998cc A Plus automatic gearbox engine, low compression, lead free (1985 on)

BMC/Leyland/Unipart Mini 1098cc Reconditioned Engine Part Numbers
BHM1042 1098cc manual gearbox engine, 'Gold Seal' (1975-80)
RKM1150 1098cc manual gearbox engine, 'Silver Seal' (1975-80)
BHM1229 1098cc manual gearbox engine with A Plus cylinder block, 'Gold Seal' (1980-81)
RKM1151 1098cc manual gearbox engine with A Plus cylinder block, 'Silver Seal' (1980-81)

Note that where no differentiation is made between open circuit or closed circuit breathing, or between dynamo or alternator fitment, the factory instructed that the parts concerned (rocker cover, tappet cover, pulley etc.) should be swapped over from the old engine to the new one as required.
Rebuilt or Repaired 998 and 1098cc Engine Assemblies


From 1963-69 the fuel pump drive aperture studs secured a blanking plate, plus the open circuit breathing vent pipe (if fitted). From 1969 onwards, they secured the mechanical fuel pump. For mechanical fuel pump fixing details, including the gasket (which is not the same as the blanking plate gasket), please see the 'Fuel Pumps - Carburetter' section in the Fuel and Exhaust Systems area of the Somerford Mini Catalogue.

11 2A265 PLATE, blanking fuel pump drive aperture 1 1963-69.
12 GUG705557GM GASKET, blanking plate 1 1963-69.
13 FNZ105 NUT, blanking plate to block 2 1963-69.
14 LWZ205 WASHER, locking 2 1963-69.
15 PWZ105 WASHER, plain 1 Required for open circuit breathing vent pipe bracket (if fitted).
16 53K615 STUD, oil filter head 2 Manual gearbox, 1963-73. For paper element oil filters.
CHS2613 STUD, oil filter head 2 Manual gearbox, 1973 on. For 'spin on' cartridge oil filters.
17 22A1203 PLATE, blanking cylinder block oil filter face 1 Automatic gearbox.
18 88G402 GASKET, blanking plate 1 Automatic gearbox.
19 SH506071 SCREW, blanking plate to block 2 Automatic gearbox.
20 12G1058 WASHER, sealing 2 Automatic gearbox.
21 12A1910 SCREW, main bearing cap to block 6
22 2A54 DOWEL, main bearing cap 6
23 6K927 LOCK TAB, main bearing cap screw 6
24 BHM1211 LINER SET, camshaft bearings 1
25 3H576 TAP, cooling system drain 1 Alternative to plug; fitted up to early 1980s.
26 2K4954B WASHER, fibre, drain tap A/R
This washer not only seals the tap to the block, but also is intended (using whatever quantity is necessary) to shim the tap so that when tightly screwed to the block the spout faces downwards.

27 53K2853 PLUG, cooling system drain 1 Alternative to tap; fitted throughout production.
28 6K638B WASHER, sealing plug 1
29 2A612 HOUSING, distributor 1 1963-65; does not require O ring.
30 12A1136 HOUSING, distributor 1 1965 on; requires O ring.
31 13H2792 O RING, housing 1 1965 on.
The later 12A1136 distributor housing may be fitted in place of the earlier 2A612 housing, but only if a 13H2792 O ring is fitted with it.

32 SH604061 SCREW, housing to block 2 1963-80; not A Plus cylinder block.
33 LWZ404 WASHER, shakeproof 2 1963-80; not A Plus cylinder block.

Engine Front Mounting Plate
34 2A970 PLATE, engine front mounting 1 1963-79.
35 12G2626 PLATE, engine front mounting 1 1979 on. Accepts chain tensioner.
36 GUG705554GM GASKET, plate to block 1
37 SH605051 SCREW, plate to block 2
38 LWZ305 WASHER, locking 2
39 53K2016 SCREW, plate to main bearing cap 2
40 6K831 LOCK TAB, screw 1 1963-69.
41 WF600041 WASHER, shakeproof 2 1969 on. Will replace lock tab on earlier engines.
42 AHU2379 PLATE, camshaft locating 1
43 SH604061 SCREW, plate to block 3
44 WF600040 WASHER, shakeproof 3

Timing Cover 1963-79 (without chain tensioner pad)
Several timing covers were fitted in the 1960s, some with timing pointers, some without, most with stiffeners, one without. All were superseded by 1970 by 12G2506, which includes a timing pointer and lower stiffener and does not require the stiffener 12A666 listed below. The plain washers PWZ104 and PWZ105 listed below replace the original elongated washers used at different times on the A Series engine until the 1980s.

45 12G2506 COVER, front, timing 1 Includes oil seal.
46 88G561 OIL SEAL, timing cover 1 Included in timing cover.
47 12A666 STIFFENER, timing cover 1 Use on early 1960s covers suffering from poor sealing.
48 12A956 GASKET, timing cover 1
49 SH604031 SCREW, timing cover to front mounting plate 6
50 LWZ204 WASHER, locking 6
51 PWZ104 WASHER, plain 6/3 Qty. reduced when stiffener is present.
52 SH605061 SCREW, timing cover to mounting plate and block 4
53 LWZ305 WASHER, locking 4
54 PWZ105 WASHER, plain 4/3 Qty. reduced when stiffener is present.

Timing Cover 1979 On (with chain tensioner pad)
55 CAM4641 COVER, front, timing, accepts chain tensioner pad 1 1979-80; includes oil seal.
CAM4904 COVER, front, timing, accepts chain tensioner pad 1 1980 on; includes oil seal. A Plus type.
56 88G561 OIL SEAL, timing cover 1 Included in timing cover.
57 GUG705550GM GASKET, timing cover 1
58 SH604031 SCREW, timing cover to front mounting plate 6
59 LWZ204 WASHER, locking 6
60 PWZ104 WASHER, plain 6
61 SH605061 SCREW, timing cover to mounting plate and block 5
62 LWZ305 WASHER, locking 5
63 PWZ105 WASHER, plain 5
64 FNZ105 NUT, timing cover to mounting plate 1

Tappet Chest Covers
65 - COVER, tappet chest, LH, with breather pipe 1 Convex cover; for open circuit breathing (1963-66).
66 - COVER, tappet chest, LH, with breather pipe 1 Concave cover; for open circuit breathing (1966-69).
67 12G577 COVER, tappet chest, LH, with oil separator 1 Convex cover; for closed circuit breathing (1964-66).
68 12A1212 COVER, tappet chest, LH, with oil separator 1 Concave cover; for closed circuit breathing (1966 on).
There are too many varieties of LH tappet chest cover for open circuit engine breathing models to list here. However they are all detailed, along with all of the other components of each type of breathing system, in the 'Emission Controls - Engine Breathing' sections in the Fuel and Exhaust Systems area of the Somerford Mini catalogue.

69 12H941 COVER, tappet chest, RH 1 Convex cover, 1963-66.
70 12A1386 COVER, tappet chest, RH 1 Concave cover, 1966 on.
71 12A1139 GASKET, cover, cork 1 For convex type cover.
72 BH605151 BOLT, cover to block 1 For convex type cover.
73 2K4458 WASHER, bolt 1 For convex type cover.
74 GUG705505GM GASKET, cover, rubber 1 For concave type cover.
75 SH605091 SCREW, cover to block 1 For concave type cover.
76 12A1177 WASHER, cup 1 For concave type cover; 1963-85.
77 12A1176 BUSH, rubber 1 For concave type cover; 1963-85.
78 MRC1980A BUSH, rubber 1 For concave type cover; 1985 on.
The MRC1980A bush is commonly fitted in place of the 12A1177 washer and 12A1176 bush on pre-1985 engines.

Oil System Components
79 2K4994 PLUG, priming 1
80 6K464 WASHER, sealing 1
81 12H865 PLUNGER, oil pressure relief valve 1 Standard fitment.
82 BLS916 BALL, oil pressure relief valve 1 Alternative; see note below.
The ball above may be used in place of the standard fitment plunger to guard against a sticking relief valve (something that the plunger is prone to do, given dirt or metal particles in the oil). It must, however, be used in conjunction with the shorter and stronger AEA536 spring.

83 6K853 SPRING, oil pressure relief valve 1 Not 998cc Cooper.
AEA536 SPRING, oil pressure relief valve 1 998cc Cooper.
84 12A1851 CAP, threaded, relief valve 1
85 6K431 WASHER, sealing 1
86 2A797 HOUSING, oil pressure relief valve 1 Press-fit in cylinder block.
87 12A116 DIPSTICK, oil level 1 1963-66; manual gearbox.
12A1263 DIPSTICK, oil level 1 1966 on; manual gearbox.
88 AEC671 WASHER, sealing dipstick 1 1963-66; manual gearbox.
12A1262 WASHER, sealing dipstick 1 1966 on; manual gearbox.
89 12G107 TUBE, dipstick, nylon 1 1963-66; manual gearbox.
12A1261 TUBE, dipstick, metal 1 1966-80; manual gearbox. Not A Plus engines (see note below).
Note that 'hybrid' engines (with A Plus cylinder block, but not all other A Plus features) produced in the 1979-81 period also did not require a dipstick tube. For the dipstick on Minis with automatic gearboxes, please see the 'Automatic Transmission - Torque Converter and Housing' section in the Transmissions area of the Somerford Mini catalogue.
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