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Preventative replacement of alternator? Preventative replacement of alternator?
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  #31  
Old 02-12-2026, 11:01 PM
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Quote:
Originally Posted by josiahg52 View Post
Valeo 220A and the same part number for my 2011 35d.

The decoupler is a overrunning or clutched pulley that diesels should have on their alternators. INA, BMWDieselParts, and Litens all make the correct pulley. I plan to use a Litens when I rebuild mine. These type of pulleys require a tool, not exactly a tool, but a technique to remove the pulley. Basically a socket with wrench flats and a hole to pass the Torx bit through.

The Litens website doesn't show any parts for our cars.


What do you need to install this one? https://www.bmwdieselparts.com/produ...51026059657384
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  #32  
Old 02-26-2026, 08:03 PM
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Originally Posted by Bdc101 View Post
The Litens website doesn't show any parts for our cars.


What do you need to install this one? https://www.bmwdieselparts.com/produ...51026059657384
Litens and INA do not show parts for the E70 X5 in their catalogs. You will find the INA OAP listed on retailers' websites, however. Litens pulley is an OAD and works sightly differently than the INA and BMW Diesel Parts OAP. I'm going to install a Fluidampr so I actually am going with the OAP now. INA is an OEM to BMW for belt drive components. BMW Diesel Parts seems decent, but I've never perosnally dealt with them. FCP Euro sells the OEM INA p/n EA0183 and Cascade German Parts has what might be the OE M57 BMW p/n 12 31 7 560 483. You need to be sure that the required spacer is included or ensure you buy one and install it. Old pulley should come off (I'm not sure all or any X5s got the OAP hence tge lack of catalog cross reference) and you might need an OAP install tool to torque the new one on. The new OAP should have a cover/protector included also.
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  #33  
Old 06-04-2026, 06:07 PM
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Finally rebuilt my alternator and installing it soon. I dressed the slip rings for the new brushes, replaced the rectifier, and bearings, sand blasted the frame and cleaned everything well and installed a new OAP.. Looks about 95% of new. Very, very happy.
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  #34  
Old 06-04-2026, 07:27 PM
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Feels good! I didn't bother cleaning before i took it for testing and the guys at the auto shop were very surprised that it tested perfect


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