Alternator stator explosion

rivera said:

Sorry to hear that, Piero!
Makes me wonder about the quality of these FAG bearings.

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Hi Rivera.
All my bike mount FAG superblend without problems.
This could be the first time.
Ciao
Piero

mschmitz57 said:

Sounds like the Lucas rotor cracked and expanded. Even new rotors can fail.
Breaking a triplex primary chain is an impressive feat. Of course if all the swarf from the rotor and stator got into the chain it could have sped-up the failure.

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Hi.
Yes, it happened.
But i dont know why the rotor and statore fused!
Ciao
Piero

kommando said:

But what type of Lucas was it, an NOS, LAP or a Wassell one boxed Lucas.

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Hi.
New Lucas 3 phases stator and new lucas rotor.
Ciso
Piero

Hi.
Why noone speaks about the three phases BB Power box thatt could be fault .
If the Power box fault the stator could fuse.
Ciao
Piero

Hi Piero, i mentioned checking the power box but on second thoughts, I would throw it away. I t may have an intermittent fault that may not show up under testing. Not worth the risk. You have been unlucky here, but at least you have another Commando to ride just like me. Hope you go to the rally. You would get the hard luck prize. I have had it in NZ.

Dereck

mschmitz57 said:

Sounds like the Lucas rotor cracked and expanded. Even new rotors can fail.
Breaking a triplex primary chain is an impressive feat. Of course if all the swarf from the rotor and stator got into the chain it could have sped-up the failure.

Click to expand...

+1

Sorry to hear about this. It could have been worse!

Is this the one you have?
The WW part number stamped on the box would be the clue.



Infant mortality? i.e. a manufacturing defect remaining undetected until the item is put to use.
I've never heard of a superblend bearing failing, but anything is possible. It may be difficult to tell what is 'cause' and what is 'effect'.

I really doubt if the powerbox could cause such a failure - a permanent magnet generator puts out a voltage & current proportional to speed. the Regulator just dumps the excess to earth and can't exert any influence backwards.

I hope the strip down reveals the true cause. I'm especially interested to see photographs of the rotor!