AEG 479
This is a crank out of?

Cheers

Aaron

I think its an early 1275 Cooper S off the top of my head (don't you just hate it when people open their traps without thinking first!! )

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"Show me the Mini!"

its a shitty 998 crank, worth fiddle sticks all , no really its a
EN40B cross drilled, nitrided crank with 1.625'' conrod journals from a 1275 cooper S

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lookin for another clubby

Truly is..

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

so yeh aaron
its worth nothing
ill buy it off you for $2.56. firm.

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Inconspicuously Conspicuous
Appreciation without Depreciation
forever chasing clearer skies...

It's not quite that straight forward guys.
According to ST brochures and Clubman parts books I have there are 2 cranks that go under PART NO AEG 479. The first is the Mk1 'S' EN40B cross drilled crank. The second is the Mk 2 'S'/Clubman GT crank. Both these cranks are listed as part no AEG 479 but actually marked AEG 480.
BMC for some unfathomable reason distinguish between the part number and the actual number marked on the part. Another example of this is the 648 cam. It's listed as part no 648 but is actually marked 649.
My Mk 1 'S' crank (just checked it) has raised numbers forged onto the crank between 3&4 big end journals. On one side it has EN40B and on the other side AEG480.
The Mk2 'S' crank in my car at present is actually made using the large journal 1275 crank forging 12G1505 and is ground to 1.625" big end journal size. This has the 12G1505 number partially ground off and is stamped using letter and number stamps with AEG 480. (According to notes I made at the time)
Because they are made of 2 different types of steel the EN40B crank is nitrided as it is a special steel made for the nitriding hardening process but the EN16?? steel crank is not suitable for nitriding so is hardened using the tuftriding process.
The Clubman parts listing gives the crank as part no AEG 479 for early cars and 12G 1817 for later cars. The later one is presumably when they changed to the non 'S' engine.
If your thinking of paying BIG $$$$$$ for an EN40B crank the only way to be sure if it's an EN40B crank is to look for the forging markings as indicated above.
Also make sure you get it crack tested before parting with your dollars. They are all getting on for at least 35 years old and can suffer from fatigue and ageing effects - don't we all. A quick but by no means exact check is to lightly tap it with something metallic such as a small hammer (don't use a BFH) and listen to the sound. If it has a clear ringing sound that's a good sign. If it sounds dull or distorted that's not so good.

Maybe Matt Read may have more info as he seems to be the Guru on cranks, especially SA cranks. It was 1971 when those special motors appeared in SA Clubman 1100 cars. Found a web site with BMC history including SA.

Regards
RonR

ok aaron
$2.47. firm
im taking a gamble here.

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Inconspicuously Conspicuous
Appreciation without Depreciation
forever chasing clearer skies...

Hmmmm I've got a MK1 and a MK2 S motor, and BOTH have the EN40B on the web... perhaps I got lucky.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Hi Kevin,
The Mk2 'S' crank I'm using at present came from a mid 1970 build date car so it's possible there was some overlap between the EN40B cranks and the later Mk2 'S'/Clubman GT engines/cranks which are basically English Mk3 'S' motors.
Thats the best explanation I can come up with at present. I'm pretty sure the Mk2 'S' crank is the original as it doesn't appear to have been modified later from a large journal crank. It takes standard thickness thrust bearings in an 'S' block. If it was a reground large journal crank I think it may need thicker thrust bearings - not sure. I think this is your area of expertise.

Regards
RonR

I was going to pick one up for $100 but it turns out to be a typo... he wants $600, so no, i won't be buying it. Oh well.

Cheers

Aaron

ok, ill go up to $3.25.
firm.
take it or leave it.

_________________
Inconspicuously Conspicuous
Appreciation without Depreciation
forever chasing clearer skies...

Bit dear for any crank, $600.. I got a `rusty' std/std large journal one for $50... and after cleaning it doesn't even need a grind! Thanks, kazjim....

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Yea yea, rub it in......

Nahh seriously, it makes more room for my other ideas Kev !

Cheers
J

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Has this AEG480 crank number ID been sorted out, whether its EN40B or not?

Mine does not have a EN40B raised section on it, neither does it have any other raised forging numbers (that are legible anyway)

I spoke to a Toolmaker who used to make the dies for these at Aust National Forge? and he reckons they would have been changed several times due to wear/damage and the raised section may have been omitted to save tooling cost.

I am going through some bits and my one is out of a Mk11 'S'. The forging doesn't look like my other small journal crank that has 12G1288 stamped in the same place as the 'S' one has AEG480.

The 'S' one is a lighter colour than the other crank and I recall the machine shop said is was definately hardened?

Ive also got a 12G1505 and this is alot different to both of the others??

What a s4!7 fight. B!66dy MOWOG

Daniel

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Videos - Turbocharged A-Series on Dyno & at Wakefield
Mafs waz not my strong subgeckt at skkol

DOZ,
I'd take it over to Graham Russell and compare it with an EN40B S crank and a later S one, he has both.

Both my EN40B ones are marked AEG479 I think.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.