The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: mrclubike on July 22, 2017, 08:35:49 PM

Title: Oil leak from the Brake Cam
Post by: mrclubike on July 22, 2017, 08:35:49 PM

 I  have been having  problems with an  oil leak from the brake cam
Of course it likes to leak when I am on a long trip
and get all over the side of the tire 
So I am going try these
Mcmaster Carr Part #1200N185
I just install them today and I think they are going to work much better than the standard O ring that is specified in the Parts book
The feel like they have better tension in the housing and should seal better
I will  update if I have any problems
I have the type of housing that does not have the tube that the cam runs thru

Title: Re: Oil leak from the Brake Cam
Post by: peteremc on July 23, 2017, 03:42:34 AM

Good luck.

I had the problem last year after re-assembling the bike without replacing the o-rings and was really scared by the amount of oil that had distributed itself around my rear tyre. Damn dangerous.

I pulled the shaft (because I didn't have anything to remove the o-rings without damaging them and it was about 30 minutes before the shop closed on a Saturday), went to a really great local auto-supplies store where they matched them, charged me about $1 and no problems since.

Title: Re: Oil leak from the Brake Cam
Post by: Justin B. on July 23, 2017, 01:02:52 PM

Really interesting looking O-ring.

Title: Re: Oil leak from the Brake Cam
Post by: Bob_Roller on July 23, 2017, 01:15:12 PM

I've gotten into the habit of replacing these  O-rings every time I have a rear tire replaced .

Only takes 10 minutes or so to replace them .

Title: Re: Oil leak from the Brake Cam
Post by: Barry on July 23, 2017, 01:58:48 PM

So you used an O ring of larger section and in the new vs old pic,   new is on the left and old on the right with two O rings stacked on top of each other. Is that correct ?

Title: Re: Oil leak from the Brake Cam
Post by: Bob_Roller on July 23, 2017, 02:05:45 PM

Here's page from the suppliers catalog .

https://www.mcmaster.com/#catalog/123/3549/=18mjd76

https://www.mcmaster.com/#1200n185/=18mjica

Title: Re: Oil leak from the Brake Cam
Post by: Rob Valdez 79 R65 on July 23, 2017, 02:48:22 PM

Quote

new is on the left and old on the right with two O rings stacked on top of each other. Is that correct ?

No (I am pretty sure).
The old is on the left.  The new, which has a non-round cross-section (X-ring?), is on the right. 

Title: Re: Oil leak from the Brake Cam
Post by: Barry on July 23, 2017, 03:49:37 PM

I never saw an X profile O ring before.  The stuff you guys can buy at the local hardware store.

Title: Re: Oil leak from the Brake Cam
Post by: mrclubike on July 23, 2017, 08:57:02 PM

Rob is correct 
original Oring is on the left the quad ring is on right

Title: Re: Oil leak from the Brake Cam
Post by: mrclubike on July 23, 2017, 09:05:24 PM

Quote

I've gotten into the habit of replacing these  O-rings every time I have a rear tire replaced .

Only takes 10 minutes or so to replace them .

I had just replaced them less than 3000 miles ago  :'(
If the wheel is off it isnt much to change them 

Title: Re: Oil leak from the Brake Cam
Post by: Rob Valdez 79 R65 on July 23, 2017, 10:47:15 PM

Do you use those quads in your work, Mrclubike?

Title: Re: Oil leak from the Brake Cam
Post by: mrclubike on July 24, 2017, 08:58:16 PM

Quote

Do you use those quads in your work, Mrclubike?

Not very often usually they are just the round cross section type