Just reading some w211 stuff... seems like a common "wear" item on the w211

But looking up the part "Voltage regulator"--- don't really find it as separate part for the e320 cdi versus rest of MB's???

please educate me-- or would entire Alternator need to be replaced???

thx

The Bosch AL0851X is a very common alternator. Amazon lists several voltage regulators, along with several other sites. If you want a better guarantee of fitment, I'm betting Pelican Parts can get it with a phone call.

Part # 003 154 65 06

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Sam

84 300SD 350K+ miles ( Blue Belle )

From the school of hard knocks

This platform uses an alternator that is controlled by “LIN Bus”. It does not have the traditional D+ wire.

I went though two NAPA rebuilt alternators before going to the dealer for a legit MB remanufactured alternator. The rebuilders don’t understand how to verify the LIN bus is working.

Story buried in this thread about the alternator W211 CAN Bus problems

Granted this is a 642 engine but your experience will be similar.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

Is this why-- the Voltage regulator (which seems to be what really fails-in most alternators) - is NOT listed as separate part on Pelican or other BIG parts sites???

or does the e320 cdi alternator design... NOT allow for removal/fix of JUST voltage regulator

NBuying a "rebuilt" ot "refurbished" alternator usually means new VR and if you're lucky new bearings. The voltage regulator on a 211 can be replaced on its own. It bolts onto the back of the alternator just like every other MB alternator. The only difference is that it lacks the D+ Terminator. It's digitally controlled by the car.



I don't know about the CDI but on a V6 gasser 211 you can replace the VR in under an hour. This includes dropping the alternator. Genuine Bosch VR is under $40 on AMZN and just about everywhere else. I've had one randomly fail on me (broken brush) so now I keep a spare in the trunk.

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CENSORED due to not family friendly words

Is that VR in photo -- the Correct Part # for the e320 cdi?

Once again- VR's seem plentiful for ALL w211's ... when i search- But on parts/supply network-- they all say -- Does NOT fit e320cdi?

The VR is the same. Only difference is the plug is pointed in a different direction. Probably an access issue.
https://www.mbpartsworld.com/oem-parts/mercedes-benz-voltage-reg-0041540306

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CENSORED due to not family friendly words