The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: 30yearredbike on November 05, 2011, 03:44:54 PM

Title: replacement of the alternator rotor
Post by: 30yearredbike on November 05, 2011, 03:44:54 PM

I have been struggling with the replacement of the alternator rotor in my '81 R65.  Since the original died, I have tried to install 3 others, none of which have fit properly.  The problem is excessive length, not diameter.  Side by side, the original is  approximately 1 -4 millimeters shorter than the replacements.  Rick Jones has been very helpful and patient, even going so far as to install rotor #3 in his own bike with no problem.  After carefully installing that one in my bike this a.m., I am still unable to turn over the engine.  I'm stumped.

Title: Re: replacement of the alternator rotor
Post by: wilcom on November 05, 2011, 04:31:32 PM

Quote

After carefully installing that one in my bike this a.m., I am still unable to turn over the engine.I'm stumped.  

Does that mean that there is "binding in the alternator parts keeping the motor from turning over? or does it mean there is no Battery to the starter and it won't turn over?

Title: Re: Thread Degradation
Post by: Bob_Roller on November 05, 2011, 06:17:13 PM

Red Bike, why don't you start a separate thread on your problem, it's kinda 'buried' here .

If you can post a few pictures, it may be helpful, you've got an uncommon issue there .

Title: Re: Thread Degradation
Post by: Rob Valdez 79 R65 on November 06, 2011, 05:39:26 PM

[movedhere] BMW Technical Q&A, Primarily R65 [move by] Rob Valdez 79 R65.

Title: Re: replacement of the alternator rotor
Post by: tvrla on November 07, 2011, 10:56:06 AM

One millimeter is about .040". Four mullimeters is about an eighth of an inch. I have a difficult time understanding where that minimal extra length could cause a problem.

Was anything else changed?