Alternator compatibility, pulley swap

Jan 25, 2006 3 Replies
L

"Notes: Bosch provides 2 different #s to replace this OE # on 900 models. Use AL 69 X (0 120 469 945) thru '87 ch#s H2008686, H3006971, & H7013654. Use AL 124 X (0 120 469 682) after '87 ch#s above and later models."



But there doesn't seem to be any way to specify whether you want the AL



69 X or the AL 124 X. They share the same SKU at all of the parts sites I've checked. The one I got says AL 69 X, and I have a 1990
900T. Is there any difference besides the label?

Second question: How do you lock down the alternator's rotating assembly to get the 22mm nut off the shaft in order to remove the pulley/fan assembly? Sticking a screwdriver through the fan into the body might damage the blades, and I sure don't want to be sticking a screwdriver into the new alt to tighten the nut.



Thanks, Ludwig



1990 900T
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P

...wrapping some cloth around the circumference of the fan and twisting the cloth up tight is one way of doing it, as it spreads the load across all (or most) of the fan blades. Then get a beefy mate to hold the alternator and cloth while you do the biz with a spanner or socket on the retaining nut. You can still bend them if you really try though, so go easy. If the nut is a self-locking nut - either a Nyloc, or one with a deformed thread, it can still take quite a bit of effort to tighten it. If it's *not* a locking nut, clean the thread of the nut and shaft and apply an appropriate thread locking fluid such as Loctite - again, if you use too much beef something will bend...

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D

Use a nut cutter to take the old nut off. Get one at your local auto supply shop.

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L

Got the nut off by sticking a screwdriver into the alternator so that the internal armature was taking the force instead of a fan blade. But I'm not at all comfortable with this method to put it on the new one, and I'm still wondering if the AL 69 X is even compatible.

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