GoldenMotor.com Forum

General Category => Magic Pie & Smart Pie Discussions => Topic started by: Wadda on July 10, 2013, 05:36:16 AM

Title: What is it?...and where does it go?
Post by: Wadda on July 10, 2013, 05:36:16 AM

(http://wadda.org/magic_pie/unknown-washers.png)


I pulled the faceplate off the freewheel side of an MP3.

These two thin washers fell out from who-knows-where.  The $2 coin came from my pocket.

I don't see a reason for them.  Where do they go; and what are they for?

The $2 coin I've figured out.

Title: Re: What are they?...and where do they go?
Post by: Bikemad on July 10, 2013, 10:17:27 AM

Those are spacer shims, which are fitted on the axle before the cover goes on.
They are needed to remove excessive end play between the bearing and the stator, therefore preventing the hub assembly from moving sideways on the axle as indicated by C  below:

(http://www.arhservices.co.uk/GoldenMotor/Movement.JPG)

Alan
 

Title: Re: What is it?...and where does it go?
Post by: Wadda on July 10, 2013, 12:07:10 PM

Oh, righto.  Makes sense now.

I had placed them on the shoulder of the shaft, but when I put the faceplate back on the faceplate wobbled until I snugged up the socket head bolts around the perimeter...

Without the washers the faceplate laid flush...I just never checked for play in the "C" direction.

Thanks.

Title: Re: What is it?...and where does it go?
Post by: Bikemad on July 11, 2013, 01:15:45 AM

It would appear that GM have taken notice of one of my previous my posts regarding bearing play (http://goldenmotor.com/SMF/index.php?topic=4637.msg26751;topicseen#msg26751) and are now using solid shims instead of the wavy washers to preload the bearings, which should considerably reduce the movement indicated by B.

It's reassuring to know that someone at GM is obviously paying close attention. ;)

Alan
 

Title: Re: What is it?...and where does it go?
Post by: GM Canada on July 11, 2013, 12:53:05 PM

After several years of reading your posts it is clear to me that everyone should be paying close attention to your thoughts.

Gary

Title: Re: What is it?...and where does it go?
Post by: Wadda on July 11, 2013, 03:44:35 PM

He is a valuable reference...(since GM reads this...)

Title: Re: What is it?...and where does it go?
Post by: Morgen 3Eman on July 11, 2013, 06:11:53 PM

Hey, GM, not only is Alan knowledgeable, thoughtful and smart, he is also tall and good looking! :)

Seriously, Alan, you are a treat to have on the site.

Sincerely,
Dennis

Title: Re: What is it?...and where does it go?
Post by: Bikemad on July 12, 2013, 12:41:02 AM

Hey, I wasn't fishing for compliments, but thanks for the vote of confidence guys.  :-[

Alan
 

Title: Re: What is it?...and where does it go?
Post by: Morgen 3Eman on July 12, 2013, 05:08:40 AM

Awwww, and he's modest,too. :)

Dennis

Title: Re: What is it?...and where does it go?
Post by: MelbourneRider on July 16, 2013, 12:19:49 AM

That's what they are for... darn..! I didn't know what they are and I have left them out too when upgrading the phase & hall wires.

Will it do damage to the pie if I left them out? How bad will it be without them?