Another "crank sprocket" broken

[driftin jo]

They are not torquing the bolt up correctly, it is the only reason they brake.

[Jamo]

Pm volcano rs on the forum

[Cobra]

Thanks for your answer Jamo.

I'm not sure, since the job was done on the shop, when I wasn't present.
Regarding the crank sprocket upgrade, do you know any brands that sell it?
Are there any differences between AAN and ABY?

[Jamo]

Yes buy uprated one volcano rs sells them so do other people
Did you use an impact gun to do up the crank bolt?

[Cobra]

Almost going quits on my S2 Avant.
Bought a AAN engine to rebuild, since my ABY had a hole on the block.
Everything went ok on the rebuild, at least it seemed like that.

Since the engine is in its place, I've had two crank sprockets broken, the litle piece that fits on the round part of the crank just disappears!!!
2 crank sprockets for just 2000kms!

What could be causing this?

The engine part around the sprocket is 054 115 109B
And the pulley that is attached directly to the sprocket 054 105 255E

Any compatibility issues?
Is there any upgrade from the OEM part?