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Milwaukee Eight (M8) 2017 and up M8 Air and Liquid Cooled discussion

Pics of changing out the damping ring spacer.

 
  #11  
Old 07-14-2019, 04:39 PM
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Thanks for the photos.
 
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Old 07-14-2019, 07:25 PM
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Originally Posted by Max Headflow View Post
As mentioned it is simply a spacer. The Belleville spring is about 0.030 thick, and maybe 0.100 high (should have measured). The friction disc is about 0.148 thick.. With the spring sitting on the spacer, you got say 0.063 + 0.100 height so as the clutch is let out the spring/spacer start pressing the clutch stack together causing it to drag for say the last 0.163 (spring and spacer) - 0.148 (friction) = 0.015 thou.. Increasing the spacer causes the clutch to start dragging another about 0.016" earlier or 0.031".
Trying to get a handle on the engineering on this. Is this set up do to the hydraulic clutch or the nature of the recluse clutch (sorry if i did not spell it correctly)

I thought the damper was Bellville and its purpose was to brake the rear disk straight so it did not bind since I assumed the actual clutch diaphragm spring flattened it.

In your first pictures, is that a seal on the clutch pushrod? How come Harley is having do much problem with that?

Is there a diaphragm spring plus those 3 coils?
 

Last edited by RIPSAW; 07-14-2019 at 07:30 PM.
  #13  
Old 07-14-2019, 08:33 PM
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Originally Posted by RIPSAW View Post
Trying to get a handle on the engineering on this. Is this set up do to the hydraulic clutch or the nature of the recluse clutch (sorry if i did not spell it correctly)

I thought the damper was Bellville and its purpose was to brake the rear disk straight so it did not bind since I assumed the actual clutch diaphragm spring flattened it.

In your first pictures, is that a seal on the clutch pushrod? How come Harley is having do much problem with that?

Is there a diaphragm spring plus those 3 coils?
Rekluse? This is the stock clutch. The seal disc in yuestion is only on the newer bike and is on the trans side
 
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Old 07-14-2019, 09:02 PM
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Originally Posted by RIPSAW View Post
Trying to get a handle on the engineering on this. Is this set up do to the hydraulic clutch or the nature of the recluse clutch (sorry if i did not spell it correctly)

I thought the damper was Bellville and its purpose was to brake the rear disk straight so it did not bind since I assumed the actual clutch diaphragm spring flattened it.

In your first pictures, is that a seal on the clutch pushrod? How come Harley is having do much problem with that?

Is there a diaphragm spring plus those 3 coils?
This clutch is not specific to any part of the hydraulic clutch or a recluse. It's called a Slip Assist clutch. If you look closely you will see that there are 3 ramps between pressure plate and inner clutch hub. Theses ramps assist in the clamping action of the springs which allow a lighter spring to be used and lighter clutch pull. You can see the ramps and notice that the outside pressure plate actually carries one of the steel plates. As the plates clamp, the outer steel causes the outer pressure plate to rotate, increasing clamping pressure. IMO, the pressure plate rotating clearance is what makes these new clutches clunk.

The slip /assist design really has nothing to do with the small belleville damper spring tho IMO the slip/assist narrows the friction zone some. Increasing the thickness of the spacer widens the friction zone some. It could have also been changed by changing the Belleville spring but it was probably cheaper to change the spacer.

Here is Yamaha's version of slip assist..

Not sure what you are trying to describe as for the purpose of the small Belleville spring but it's purpose it to engage the clutch slowly / gradually. In doing so it can keep the clutch from chattering. It occupies the space next to the first clutch plate and does not do anything to the plate. With the clutch fully engaged, the inner friction is compressed between the inner part of the hub and steel plate right next to it. This damper function is pretty much the same on every big twin HD clutch since 1998.

This clutch does not have a diaphragm spring like the TC regular clutches. It has the 3 spring and the assist feature. The new softails have the same clutch but use clutch cable. I'm not sure where you see a seal. There isn't one in any of the pics. Center of the clutch pressure plate holds the throwout bearing instead of an adjuster which different than cable operated bikes. The oil transfer issue is a completely different discussion in itself.
 
  #15  
Old Yesterday, 05:34 AM
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This is what I first thought I was looking at..
 
 


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