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Clutch slip #731384
04/08/18 8:56 pm
04/08/18 8:56 pm
Joined: May 2009
Posts: 285
Omaha, NE, USA
Paul Sammut Offline OP
BritBike Forum member
Paul Sammut  Offline OP
BritBike Forum member
Joined: May 2009
Posts: 285
Omaha, NE, USA
As I was taking my '51 Rapide for a test ride after installing twin-leading shoe brakes (and in a rare window of fine weather between snowfalls), I noticed significant clutch slip (standard clutch). The brakes work well (thank you, Vincent Speet!) but the slipping rapidly became worse, so I quickly returned home. I removed the clutch cover, expecting to see that oil had managed to seep past the shaft into the chamber. Well that hadn't happened, but I noticed the clutch shoes had lost chunks of material and noted that the circlip (865) formerly retaining one of the shoes wasn't there. As I scraped out the housing of material, the twisted, mangled circlip was found in the debris. I believe I had used new circlips and had carefully ensured they were seated when I worked on the clutch at the beginning of the last season. Now, of course, I am second guessing myself and imagine I didn't do a good enough job. However, i am going to worry about it in the future as I install new assemblies and circlips.
Has anyone else had this happen? Are there different qualities of circlips available? John Healy, I will contact you tomorrow to order new parts!
Thanks in advance,
Paul.


Paul

'74 Commando
'15 R1200 GS Adv
'51 Vincent Rapide
'58 Ariel Square Four
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Re: Clutch slip [Re: Paul Sammut] #731700
04/12/18 12:05 pm
04/12/18 12:05 pm
Joined: Nov 2007
Posts: 125
Birmingham, UK
T
Twin Pot Phil Offline
BritBike Forum member
Twin Pot Phil  Offline
BritBike Forum member
T
Joined: Nov 2007
Posts: 125
Birmingham, UK
Hello Paul,
I am assuming that the clutch shoes have not been 'faced up' at all - by removing some of the shoe metal to regain a flat surface, as that allows the shoes too much room to walk up and down the spindle (thrust washes to take up the difference are your friend when here). If there are washers involved make sure they are not biasing the way the shoes sit on the spindles relative to each other, as that make the drum want to also bias on its axis (but only by a minute amount).
Are the shoe spindles new(ish) or original, some repop units (many years ago) did not have the groove for the circlip cut correctly as a square form - there was a noticeable radius at each of the points where the side of the groove met the floor of the groove, causing the circlip to 'ride up' out of the groove when in use.
The circlips should be 'springy' such that as you open one up and then let the tension off it should return to where it came from (some have been known to be soft as a result of poor heat treatment).
I always worked on the basis of the more of a s*d the circlip was to get on the spindle, the more likely it was to stop there!

Does that help any?
Cheers
Phil

Re: Clutch slip [Re: Paul Sammut] #732029
04/16/18 3:31 am
04/16/18 3:31 am
Joined: May 2009
Posts: 285
Omaha, NE, USA
Paul Sammut Offline OP
BritBike Forum member
Paul Sammut  Offline OP
BritBike Forum member
Joined: May 2009
Posts: 285
Omaha, NE, USA
Thanks, Phil. I don't know the answers to your questions, I'm afraid, as I bought the bike only about 18 months ago. I will certainly inspect the spindles and grooves carefully. The shoes appear standard to my unpracticed eye. I'm hoping the new circlips, which are on their way from VOC will be of good quality. I will also check to be sure there is no "sidedness" (is that a word?) to them.
Regards,
Paul.


Paul

'74 Commando
'15 R1200 GS Adv
'51 Vincent Rapide
'58 Ariel Square Four

Moderated by  John Healy 


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