|
27 October 2003 |
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 2 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, et al were seriously prone to not adhering
to specifications and applications lists. But it is better than nothing at all!
|
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 |
|
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.