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4 minute read
Diy: Valeo alternator rebuild
Compliments of aioros @ bimmerfest.com
1-31-2011
This diy is for the Valeo alternator in a '99 528i auto w/140,000 miles on it.
Alternator info:
Valeo 120amp 14V #2541963A, BMW part #12311432987/981
Parts needed:
One Valeo Voltage regulator OEM, BMW part #12311713839, from smithcoelectric.com for $86.83 incl. shipping their part #8008-4474, you may find it in ebay now.
One Ball bearing 17mmX52mmX17mm B17-99DG8 NSK brand, from smithcoelectric.com for $34.85 incl. shipping, their part #5-5224 it's a bosch oem.
One Ball bearing 15mmX35mmX11mm 6202-2NSE Nachi brand, from vxb.com for $9.89 incl. shipping.
All the parts took about 3 days to reach me. I suggest if you plan to do this rebuild, order the parts on a Sunday so most likely they will ship on Monday and you'll get them by Wednesday or Thursday the latest. that is if you have the time to wait, otherwise you'll pay at least $200 for a remanufactured one 
Tools needed for the dis-assembly and assembly of the alternator:
sockets: 6mm, 7mm, 8mm, 22mm
dead blow hammer or any other hammer and a vise.
Something to pull the small ball bearing out of the shaft.
The whole procedure took me about 5hrs from removing the alternator to put it back in.
I hope this helps anyone out there:
