Alternator 'heads up' - BMW Forum -

3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 01-07-2012, 07:06 PM Thread Starter
Join Date: Nov 2011
Posts: 7
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
C Sean Watts is on a distinguished road
(Thread Starter)
Alternator 'heads up'

With winter upon us, I like many others, suffered the 'old battery = no start in cold' thing. Turns out the battery was almost 8 years old so I don't feel so bad. Just for easier sleeping I pulled the alternator to make sure I didn't cook the rectifier or anything else. It was good; made 14V, ripple = 0.8V, no burned or 'leaking' diodes (they hold water?), no oscilloscope but also no indication of lost phase(s). BUT.....

Since we have easily removable regulator/brush assemblies I pulled it off and saw what 156K miles does to brushes - The original part number = (as seen on back of transistor) NEW part no. ***for 80 or 140 amp BOSCH - alternator = 1 197 311 225 (Valeo may be different)*** {if you notice the width of the brushes in the comparison are not the same - good eye, that's for an Audi but the length is what I need to demonstrate}

*NB* - They must make a straight/square connection on the commutator part of the rotor. I had to file mine very slightly to stop if from seating cockeyed. (look at the short brush and you'll see why)

I went from 12.45V to a rock steady 14.1 at the battery at idle.

My hope is some fellow forum members will read this and NOT have to buy a new alternator if it's not totally bad...
Attached Thumbnails
Click image for larger version

Name:	part no 001.JPG
Views:	226
Size:	658.7 KB
ID:	29949   Click image for larger version

Name:	part no 002.JPG
Views:	144
Size:	485.8 KB
ID:	29950   Click image for larger version

Name:	part no 003.JPG
Views:	152
Size:	548.2 KB
ID:	29951  

Last edited by C Sean Watts; 01-07-2012 at 07:17 PM. Reason: forgot
C Sean Watts is offline  
Sponsored Links
post #2 of 2 (permalink) Old 01-08-2012, 08:48 AM
Captain... Savvy ?
Jack Dabsy's Avatar
Join Date: Apr 2011
Location: Barnsley UK
Posts: 2,194
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Jack Dabsy will become famous soon enough
Excellent topic
Annoying to hear when people change the whole unit when its just an easy fix !

Eso es todo!
Please press the "REP" button if you are happy with your response/answer...

Please JOIN, or just have a look... Its Totally FREE...
BMW Part Market

BMW Online Manuals (TIS)

New Member ?
Jack Dabsy is offline  
Sponsored Links

  BMW Forum - > BMW Model Specific Forums > 3-Series (E36)

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Similar Threads
Thread Thread Starter Forum Replies Last Post
New heads on a Nikasil M60 540John 5-Series (E12,E28, E34, E39, E60) 12 10-07-2009 02:31 PM
help, my heads messed up beamerboy85 3-Series (E21, E30) 2 02-18-2007 01:03 PM
m3 heads Usedtobe13s 3-Series (E46, E90) 0 09-19-2004 09:30 PM
What year i heads fit an 87 ETA? Houston 3-Series (E21, E30) 1 06-22-2004 02:14 PM

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome