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Title: Ducati slipper .... orientation of the parts? Post by: stopintime on May 17, 2019, 12:09:10 PM My friend's DP slipper might have been incorrectly assembled ??? The 'spider' spring thingy has broken twice.
Done it? No problem? Share the orientation of the parts? [thumbsup] His pressure plate (https://live.staticflickr.com/65535/47870519781_d7734e7f40_z.jpg) (https://flic.kr/p/2fW9VKk) 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.. (https://live.staticflickr.com/65535/40904041333_2b9ca8e277_z.jpg) (https://flic.kr/p/2fW9VKk) Alto/Up means pointing right installed or up when holding the assembly with basket as a basket (?) (https://live.staticflickr.com/65535/47818318772_d5909a2ac3_z.jpg) (https://flic.kr/p/25jxUpX) The 'shoulder' spacer goes in first (?) The washer next, but which way? (https://live.staticflickr.com/65535/47081180014_3c4b529c0c_z.jpg) (https://flic.kr/p/2fRxocW) 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 (https://live.staticflickr.com/65535/33993320818_b1668514c2_z.jpg) (https://flic.kr/p/2eJpmx1) (https://live.staticflickr.com/65535/46954320245_6d556c52d8_z.jpg) (https://flic.kr/p/TMSDYf) (https://flic.kr/p/2excaxB) Title: Re: Ducati slipper .... orientation of the parts? Post by: Speeddog 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. Title: Re: Ducati slipper .... orientation of the parts? Post by: stopintime on May 18, 2019, 02:31:21 AM [thumbsup]
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? Title: Re: Ducati slipper .... orientation of the parts? Post by: Speeddog on May 18, 2019, 08:13:27 AM [thumbsup] 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. Title: Re: Ducati slipper .... orientation of the parts? Post by: stopintime 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? Title: Re: Ducati slipper .... orientation of the parts? Post by: stopintime 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" :P :) Title: Re: Ducati slipper .... orientation of the parts? Post by: Speeddog on May 21, 2019, 06:37:58 AM Concave out, like the basket.
Title: Re: Ducati slipper .... orientation of the parts? Post by: stopintime on May 21, 2019, 02:21:35 PM Concave out, like the basket. Thank you [thumbsup] 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. Title: Re: Ducati slipper .... orientation of the parts? Post by: Speeddog on May 21, 2019, 02:26:27 PM Welcome! [beer]
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? Title: Re: Ducati slipper .... orientation of the parts? Post by: stopintime 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.
Title: Re: Ducati slipper .... orientation of the parts? Post by: Speeddog 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. |