Engine identification numbers
All models up to 1993
850 Mini
8A Austin up to 25.000
8MB Morris up to 25.000
8AM Austin/Morris 25.000 on
8AH Austin/Morris automatic
8AJ Austin/Morris closed circuit breathing
8AK Austin/Morris automatic with closed circuit breathing
8WR Wolseley Hornet, Riley Elf
8AC Moke
85H/101 1969 on
On 850cc the 3rd suffix letter "L" or "H" denotes low or high compression, eg. 8AM/U/H101 denotes high compression
998 Mini
9WR/ Wolseley Hornet/Riley Elf MKII pre closed circuit breathing
9AD/ Austin/Wolseley Hornet/Riley Elf MKII with remote gearbox, closed circuit breathing
9AE/ Wolseley Hornet/Riley Elf MKIII
99H/-/101 on Wolseley/Riley/Mini Clubman/Mini 1000cc 1970 on MKIII dished piston
99H/791 Mini 1974 on dished piston
99H/997 A-plus block 1980 on flat top piston, economy 2.95 ratio
99H/A97P A-plus, dished, pre A-plus gears, 3.44 final drive, 12" wheels
998 A-plus block with centre lokating groove on maincap 1985 on
Flat top with circlip type piston
99H/B81 to engine 127431
99H/C20 to engine 105023
99H/997 from engine 127422, 2.9 final drive (economy)
99H/A53P >
Flat top with press fit gudgeon pin pistons
99H/B81 from engine 127432
99H/C20
from engine 105024
99H/D80
Flat top with press fit gudgeon pin pistons (lead free)
99H/G30/G32/G33
99H/F15/F16
99H/E20/E21
99H/D81
LBB10089
Dished pistons with circlip type pistons
99H/B83P to engine 102908
99H/B84P to engine 100216
Dished pistons with press fit gudgeon pin
99H/D83P from engine 102909
99H/D84P from engine 100217
Dished pistons with press fit gudgeon pin (lead free)
99H/G31
99H/E22
LBB10175
1100 Mini
10AMW/Ta Clubman Estate plus Austin 1100 (ADO16)
10H791 Clubman Saloon
10H/-/H all Austin 1100cc 2/4 door derivatives Saloons (ADO16)
10GR/Ta/H MG 1100cc
10GRB/Ta/H MG 1100 and Wolseley 1100
10V/Ta/H Vander Plas 1100cc
1275 Mini
With solid wall block
12G/Ta/H 1275 'S' rods Wolseley/MG/Riley/VP1300 (ADO16)
12H379 1275GT, dynamo, neg. earth, electric fuel pump
12H380 1275GT, alternator, electric fuel pump, remote gearbox
12H389 1275GT, dynamo, mechanical fuel pump, remote gearbox
12H390 1275GT, alternator, mechanical fuel pump, remote gearbox
12H706 1275GT, alternator, mechanical fuel pump, rod change
12H397 Cooper 'S', MKIII, dynamo negative earth
12H398 Cooper 'S', MKIII, alternator
12H/-/ 1275, Allegro, Austin 1300cc
12H610/635 Innocenti Mini with Duplex, 11 stud head
12H719/832 Innocenti Mini withSimplex, 11 stud head
997 Cooper
9F/Sa/H 101 to26376 (except19201 to 20410, which became 1070)
998 Cooper
9FA/Sa/H MKI Austin pre closed circuit breathing
9FD/Sa/H MKI Morris up to engine no. 1934, all Austin MKII closed circuit breathing
9FD/Sa/h Morris MKII from engne no. 1935-33600, closed circuit breathing
9FD/Xe/H 4 synchro gearbox introduced
99H/-/H last of manufacture 1969
1275, 1990 on 12A
12A/2A carburettor
12A/2B carburettor and catalyst
12A/2D TBI fuel injection 9.4CR
12A/2E TBI fuel injection 10.1CR
Following Suffix:
GO1 10.1CR, 3.1 final drive/catalyst, no oil cooler
GO3 9.4CR, 3.1 final drive/catalyst, May 1992 on
GO4 9.4CR, 2.76 final drive/catalyst, France only
GO5 9.4CR, Auto/catalyst
F53 10.1CR, 3.1 final drive/catalyst with oil cooler
F75 9.4CR, TBI, 3.1 final drive (non open loop catalyst)
F76 9.4CR, Auto (non open loop catalyst)
F77 10.1CR, TBI Cooper, 3.2 final drive (non open loop catalyst)
Cooper 'S' variants
970cc
9F/Sa/X 29001-29003 Tecalemit filter
9FD/Sa/X closed circuit breathing introduced, Tecalemit filter
9FE/Sa/X closed circuit, filter with oil switch introduced
9F/Sa/X 29039-30029 Purolator filter with switch, closed circuit breathing
1070cc
9F/Sa/H 26501-33660 plus 19201-20410
9FD/Sa/H 33661-33948 closed circuit breathing with oil switch filter
1275cc
9F/Sa/Y 31001-31405 pre closed circuit breathing, Purolator filter
9FD/Sa/Y closed circuit breathing, oil switch on filter after 32178
9FE/Sa/Y closed circuit breathing, Purolator filter with oil switch, piston change
9F/Sa/Y 32378 on, closed circuit Purolator filter with oil switch, AEG 510 camshaft introduced at 40006, cross drilled EN40B crank at 42730, metal dipstick and tube, 42548 on
12H397 MKIII 'S' with dynamo EN16 crank - tuftrided
12H398 MKIII 'S' with alternator EN16 crank - tuftrided
Only Cooper 'S' with 9F prefix engines had EN40B forged steel nitrided crankshafts. All other A-series had EN16 which was only tuftrided on MKIII 'S' and 1300 GT (ADO16) with 12G1683 stamping number on crank.