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Author Topic: Ducati slipper .... orientation of the parts?  (Read 191 times)
stopintime
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« on: May 17, 2019, 12:09:10 PM »

My friend's DP slipper might have been incorrectly assembled  Huh?  The 'spider' spring thingy has broken twice.

Done it? No problem? Share the orientation of the parts?  waytogo


His pressure plate


One of the two lower, first plates. Should have had orientational words engraved, but doesn't. Also badly worn - I suspect from being installed incorrectly..


Alto/Up means pointing right installed or up when holding the assembly with basket as a basket (?)


The 'shoulder' spacer goes in first (?) The washer next, but which way?


One directional spacer/washer (not in the photo), the the 'spider' spring thingy, a shoulder spacer/washer to allow a little movement of the 'spider' and THEN the nut


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Speeddog
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« Reply #1 on: May 17, 2019, 04:31:44 PM »

Pressure plate getting a whacking from the hub due to broken spider spring.

That first steel plate with the 6 ears on the inside, should be installed with the 'concave' in same orientation as basket.
"Concave out".

Alto/Up washer with lettering facing out.

Shoulder spacer/washer pair, shoulder spacer goes in first, with shoulder out, followed by washer. Then inner pressure plate/hub.

There should be documentation on acceptable stack height and/or gap between hub and pressure plate.
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stopintime
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« Reply #2 on: May 18, 2019, 02:31:21 AM »

 waytogo

Let me see....

From inside (leaving out the parts not in question):
1. shoulder spacer (shoulder/largest diameter out)
2. washer (seems concave/dished, but I could be wrong)
3. large plate with ears... "concave out" as if it was a dinner plate?

From looking at the pictures - any parts need replacing?
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Speeddog
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« Reply #3 on: May 18, 2019, 08:13:27 AM »

waytogo

Let me see....

From inside (leaving out the parts not in question):
1. shoulder spacer (shoulder/largest diameter out)
2. washer (seems concave/dished, but I could be wrong)
3. large plate with ears... "concave out" as if it was a dinner plate?

From looking at the pictures - any parts need replacing?

2. OK, check both sides visually and on a flat surface to confirm/deny flatness.
    This may change assembly order or require replacement.

Otherwise, affirmative on installation orientation.

Large plate with ears looks a bit second hand, wouldn't be a waste to replace it.
But I wouldn't let that stop riding, it's easy enough to replace during a lull in the season (?)

Not many folks run slippers here on the street, so I see them very infrequently, and mostly with broken spider springs.
I'd start with a stack height such that you get a 1mm gap between the pressure plate and the movable hub.
IME they need frequent fiddling to keep the stack height/gap under enough control to achieve consistent operation.
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stopintime
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« Reply #4 on: May 18, 2019, 08:29:01 AM »

................

2. OK, check both sides visually and on a flat surface to confirm/deny flatness.
    This may change assembly order or require replacement.

...........

If it IS concave - orientation?
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stopintime
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« Reply #5 on: May 21, 2019, 12:34:08 AM »

It IS concave, but no markings on it.

Natural orientation in such cases? Like "concave: always out"  Tongue

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« Reply #6 on: May 21, 2019, 06:37:58 AM »

Concave out, like the basket.
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stopintime
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« Reply #7 on: May 21, 2019, 02:21:35 PM »

Concave out, like the basket.

Thank you  waytogo AGAIN  bow down

I searched and found two videos (MW and ECS) both showing that. Other brand clutch, but same/similar parts in that area.
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« Reply #8 on: May 21, 2019, 02:26:27 PM »

Welcome!  chug

They're all working from the same original design AFAIK.
Not sure who owns it, a bit of a bone of contention as I recall.

How much would you say it was concave?
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stopintime
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« Reply #9 on: May 21, 2019, 02:31:51 PM »

Enough to notice on a flat surface and maybe by the investigative touch, but not easy to see. At first we didn't even think it was an issue.
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« Reply #10 on: May 21, 2019, 03:17:01 PM »

OK, that fits with what I recall in the ones I've seen.
It's the sort of thing that's used on a bolt/nut joint to get some compliance so it'll stay tight.
If you've replaced the flywheel, they have the same kind of washer under the nut for that.
Total tangent... such a washer would help the rear sprocket carrier stay tight....

I'm pretty sure one of the last units I worked on was some no-name replica, standard spider spring fit.

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