Alternator pulley

[itchyfeet]

I have a non standard alternator so i purchsed a second hand late style 90A bosch from a 2.1
the pulley offset is wrong so i have removed the pulley to change the various washers and spacers
i note there is no woodruff key and while most of the washers have a slot for the key the main pulley halfs do not


i also have an early style 65A bosch and have taken the pulley off that and it has the slots throughout but again no woodruff key

so my question please before i decide which pulley to refit, is a woodruff key needed?

this alternator has just been for a rebuild so i would hope i would have been told if it was important but just checking.

thanks

[dave friday]

Same here.. my replacement 90amp alternators pulley has no keyway slot!!

[itchyfeet]

Its got the keyway in the shaft but no key

[dave friday]

Yeah' mine has a keyway in the shaft,no "d"shaped key though as the pulley has no slot for the key!

[Oldiebut goodie]

I haven't seen one on an alternator either. I can remember seeing one on an alternator on a Yanmar boat engine about 30 years ago though!

[itchyfeet]

Thats really what i want to hear
ok so not really needed, just do the nut up tight and that will do

[Oldiebut goodie]

I don't know if it's the manufacturing tolerances are better but I have noticed that several things don't have a key when you would expect one. How I used to hate having to make one because it was the weekend and couldn't buy the right one. (Usually because one has dropped out into long grass or something equally stupid )

[SamsBus2012]

Sorry to jump in on the thread, but has anyone got any good tips on releasing an incredibly tigh pully nut on an alternator? Tried an oil filter wrench on the pully with no joy - off to find a freindly garage with a large engineering vice unless anyone has any better ideas?

[itchyfeet]

Im told you need a compressed airgun, the momentum of the gun overcomes the problem of not being able to fix the shaft

One of my alternators has a hex allen key pressed into the shaft which helps lock it but on mine it still would not budge with a spanner.[*]

[Jeavsy]

Sorry to jump in on the thread, but has anyone got any good tips on releasing an incredibly tigh pully nut on an alternator? Tried an oil filter wrench on the pully with no joy - off to find a freindly garage with a large engineering vice unless anyone has any better ideas?

I managed it recently using a bike freewheel removal chain whip around the pulley and a sharp smack on the ratchet arm with a mallet. Maybe taking it by surprise helped!

[itchyfeet]

Yes did one at the weekend by holding the pulley in a vice and a sharp hit with a hammer released it before to poped out of the vice

Getting back to the origional question, that one had a woodruff key and on reassembling the other 65A one i found the woodruff key i took out and forgot about

so looks like the 90A had no key because the pulley was not keyed, the shaft has an allen key in it so easy to tighten maybe thats why