Classic Mini Crankshafts:
Standard Production Crank Identification

Below is a list of crankshaft identification data by forging or stamped numbers. Yes, contrary to what many say/express, all cranks are forged. None are cast. They wouldn't last two minutes in an engine if they were cast - they'd be way too brittle. The differences are in the material used, finish machining detail and any heat treatments applied. It is by no means complete and utterly correct/infallible since Austin/Morris, British Leyland, Leyland cars, Austin Rover, Rover, etc., were seriously prone to not adhering to specifications and applications lists. But it is better than nothing at all!

Remember, if you have questions about any Classic Mini parts, give us a call at 1-800-946-2642 or contact us!

22A62
850cc - Early type with oil feed for primary gear, 1.375" dia. tail
22A63
850cc - Early type with oil feed for primary gear, 1.375" dia. tail
22A298
850cc - Early type thin-nose crank, 1.375" dia. tail
12A670
850cc - Later type with 1.5" dia. tail
12A298
997cc - Original Cooper crank
12A375
997cc - Cooper crank with oil feed hole for primary gear
12A595
998cc - Early EN16T spec
12A1451
998cc - Later, pre-A+ EN16T spec
BHM1436
998cc - A+ spec, 1985 onwards (12A1451 forging)
12G82
1100cc - Standard across the board transverse A-series EN16T spec
AEG330
970cc - EN40B forged, non-cross drilled
AEG171
1071cc - EN40B forged, non-cross drilled
AEG315
1275cc - Cooper S, EN40B forging, Nitrided, 1.625" dia. big ends, non-cross drilled
AEG316
1275cc - Cooper S, EN40B forging, Nitrided, 1.625" dia. big ends, non-cross drilled
AEG479
1275cc - Cooper S, EN40B forging, Nitrided, 1.625" dia. big ends, cross drilled
12A595
998cc - Early EN16T spec
AEG480
1275cc - Cooper S, EN40B forging, Nitrided, 1.625" dia. big ends, cross drilled
AEG623
1275cc - Cooper S, EN16T forging, Tuftrided, 1.625" dia. big ends
12G1287
1275cc - Non-S, EN16T with 1.625" dia. big ends
12G1288
1275cc - Non-S, EN16T with 1.625" dia. big ends
12G1505
1275cc - Non-S, EN16T with 1.75" dia. big ends
12G1683
1275cc - 12G1505 forging, non-S, EN16T with 1.75" dia. big ends, Tuftrided
CAM6232 *
1275cc - Rolled-fillet radius on bearing journals, A+ with 1.75" dia. big ends
* Note: This crankshaft was used in all 1275cc, A+, transverse engines including the MG Metro Turbo. There are various un-confirmed opinions on the subject of whether the material was any different, or whether it was heat treated differently. It would appear that early Turbos had just the standard spec, EN16T, non-heat treated type fitted. Later examples certainly appear to have been heat-treated, probably an up-to-date, emissions-friendly version of 'Tuftriding' (a recognised ICI registered process) - possibly a forerunner to Nitro-Carburising. These crankshafts have a distinctly charcoal-grey/black finish - mostly detectable on the webs, water pump/alternator pulley end and in the rolled fillet radii. The later being fairly 'deep' and very even.