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  #1  
Old 10-20-2003, 02:09 PM
Mike Murrell's Avatar
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Question Difference between Bosch AL66X & AL166X alternator

My vehicle is listed below in my signature. Some sources say the Bosch AL66X is the replacement reman; others say the AL166X is. Both are 80 amp from what I'm able to dig up and their mounting holes line up the same.

Would appreciate it if anyone could tell me the difference between these 2 alternators.

Thanks for your time.
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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
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  #2  
Old 10-20-2003, 08:48 PM
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al66x has 25mm shaft and is 80amp.
al166x has 35mm shaft and is 100 amp.
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  #3  
Old 10-20-2003, 09:40 PM
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Fletch - appreciate the post; however, the following site shows them to both be 80 amp.

http://www.pprok.com/pweb/c/wic?v_pn=BOA449
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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
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  #4  
Old 10-21-2003, 01:20 PM
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I am not familiar with that site, but I don’t think the data is accurate. I use the below data for those alternators.


Al166x 35mm shaft
300SL-24 M104.981-10 up to 001590
M104.981-12 up to 014273
500SL M119.960-
300SD OM603.971- up to 002386
S350 Turbo OM603.971- up to 002386

Al66x 25mm shaft
260E M103.940- from 069719
300E 2.6 M103.940-
300E M103.983- from 179742
300CE M103.983- from 179742
300TE M103.983- from 179742
300SE M103.981- from 075104
300SEL M103.981- from 075104
190E 2.6 M103.942-10 from 015138
190E 2.6 M103.942-12 from 034645

Good Luck
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  #5  
Old 10-21-2003, 06:25 PM
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Fletch - once again - thanks for the post.

I queried about a half dozen web rebuilders. Half said the AL166X was 100amp as you reported, the other half said it was 80amp.

One of the 6 said that there were two(2) AL166X alts. - one for gas & one for diesel. He said the diesel version was 100amp; the car version 80 amp.

Who knows?

Onward.
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1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
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  #6  
Old 10-21-2003, 07:40 PM
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No prob Mike, Good luck finding the correct unit.
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