Had the Alternator Pulley shoot off to try and kiss the OF front wheel. Bought and fitted a 150 amp Alternator after much head scratching to get old one out.

Examining the pulley it seems that there are roller bearings inside between this and the stub shaft of the alternator-which seems daft because the Pulley would only spin on the Alternator shaft without turning it...or am I missing my marbles
So my question to you guys is how does this work?

This is a freewheel device, so should grip one way, but not the other. They are known to seize and this could be the cause of the failure.
The seem to be fitted to diesels, to damp out the harsh vibrations of the diesel engine and prevent the alternator just shaking to pieces.
If the freewheel pulley is dead, search Ebay, but have the dimensions to hand as there are a few choices.

Search the Multipla forum for recent examples, I think.

portland_bill said:

This is a freewheel device, so should grip one way, but not the other. They are known to seize and this could be the cause of the failure.
The seem to be fitted to diesels, to damp out the harsh vibrations of the diesel engine and prevent the alternator just shaking to pieces.
If the freewheel pulley is dead, search Ebay, but have the dimensions to hand as there are a few choices.

Search the Multipla forum for recent examples, I think.

Click to expand...

Well explained and thanks Bill. I have already bought and fitted another Alternator-did not realise till now the pulley was a seperate bit of kit, but old alternator was 150K miles old and some doubt always there if the big 150A one had been fitted when it was last replaced. Seems to be purring a little better now:slayer: