I am trying to change the alternator pulley and it needs a special tool. The bentley manual calls out tool 12 3 100. Is this available through BMW and how much does it cost? (  I don't have the etk or a windows machine to use it on) It looks like a 24MM socket would fit the bolt, and a 8 MM allen wrench will hold the shaft. I could stick the allen through the socket drive hole and maybe use vise grips to turn the socket , but that would bugger up the socket, was hoping someone here had a better idea. This is for my 92 525, but probably the same for the Z as they use a lot of common parts. -- Scott |
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I just used an impact socket..(while the belt was still on, of course...)...
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If all else fails, you could take the alternator to a shop that rebuilds foreign alternators and have them change the pulley for you.
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Quote: I am trying to change the alternator pulley and it needs a special tool. The bentley manual calls out tool 12 3 100. Is this available through BMW and how much does it cost? ( I don't have the etk or a windows machine to use it on)
It looks like a 24MM socket would fit the bolt, and a 8 MM allen wrench will hold the shaft. I could stick the allen through the socket drive hole and maybe use vise grips to turn the socket , but that would bugger up the socket, was hoping someone here had a better idea.
This is for my 92 525, but probably the same for the Z as they use a lot of common parts.
-- Scott | Looks like a wrench. They call it a ring spanner.
88 88 6 123 000 $53.50 suggested retail.
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Thanks for the pricing, Ron.
as a follow up, I found that an impact wrench and 24 MM socket took the nut off, no need to hold the shaft.
As a side note, I am on the third alternator. The first one was the wrong size, the second was rebuilt incorrectly, too much play in the shaft. Hope the third one works.
-- Scott
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Actually if you have good air you don't even need to have the belt on when you change a pulley. I put a drop of locktite on the tread when I reinstall, also with an air wrench.
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Special Alternator Tool - Help