Rear shock disassembly and/or rebuild?

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blaat!
Posts: 149
Joined: Thu Aug 25, 2011 4:31 pm
Location: Massachusetts

Rear shock disassembly and/or rebuild?

Postby blaat! » Mon Oct 23, 2017 1:00 am

Anybody know of any resources for info related to Ducati single rear shocks? Like how to disassemble them. What is serviceable? Can they be rebuilt? I can't find much out there.
Thanks.
Jim

Jordan
Posts: 795
Joined: Fri Dec 24, 2010 11:29 am

Re: Rear shock disassembly and/or rebuild?

Postby Jordan » Mon Oct 23, 2017 3:14 am

The makers of Ikon suspension units, when they were called Proven Products, used to advertise that they could repair any shock absorber.
That's encouraging.

Ventodue
Posts: 474
Joined: Mon Mar 08, 2010 3:23 pm
Location: Montpellier, France

Re: Rear shock disassembly and/or rebuild?

Postby Ventodue » Mon Oct 23, 2017 8:16 am

I've only done the units on my w/c Scrambler. They came apart easy enuf. You need to knock up some kind of spring compressor to get at the retaining balls.

Image

Image

After that all is very simple inside.

Image

Image

Overhaul kits available from Ducati Vintage Store, http://www.ducativintagestore.eu/gruppo ... &sort=&fp=

HTH

Craig

blaat!
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Joined: Thu Aug 25, 2011 4:31 pm
Location: Massachusetts

Re: Rear shock disassembly and/or rebuild?

Postby blaat! » Mon Oct 23, 2017 4:54 pm

Wow, that is exactly what I was looking for! The trick I was missing was the retaining balls. I'm going to make a jig to compress them ASAP. Essentially just a spring with a damper I guess. Thanks for the photos Craig.

Any way to know how much oil to use upon reassembly? Just buy the kit an put 1/2 in each?

The rods on mine are pretty corroded so I'm not sure they will be salvageable, but I'll take them apart and find out where I'm at.

Eldert
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Location: Hazerswoude Rijndijk Netherlands

Re: Rear shock disassembly and/or rebuild?

Postby Eldert » Mon Oct 23, 2017 7:53 pm

the Ducati vintage store sell a rebuild kit with demperrods .

you have to cut the old rods from the top piece ( cast in ) and the drill a hole and tap M7 threads in the top shock mount

i think the shocks take about 65 cc of oil

Eldert

Ventodue
Posts: 474
Joined: Mon Mar 08, 2010 3:23 pm
Location: Montpellier, France

Re: Rear shock disassembly and/or rebuild?

Postby Ventodue » Tue Oct 24, 2017 7:01 am

Eldert wrote:i think the shocks take about 65 cc of oil

I can't now remember how much or what I used :? . But I have this from Rich Kennedy:

"In refilling the shock with damping fluid, I have taken the advice of Henry Hogben in Canada: 50cc of 5w oil. You can experiment with this to the extent of changing the viscosity up to 10w. Phil Hitchcock recommends 60-65ccs of oil.

Have the piston assembly at the bottom of its stroke when refilling, then tighten up the seal collar. Again, don't over tighten. Use a new O- ring for the seal between the collar and the shock body."


To which Jon Krocker added:
"I used 50 cc of 5w Belray fork oil."

amartina75
Posts: 321
Joined: Tue Aug 21, 2012 1:13 am
Location: Cincinnati, OH. USA

Re: Rear shock disassembly and/or rebuild?

Postby amartina75 » Tue Oct 24, 2017 7:24 pm

Have a look at this

http://www.motoscrubs.com/forum/viewtopic.php?f=3&t=1983&start=10

Also I used medium weight synthetic fork oil in mine.
The spring compressor is nice but not totally necessary you can do it by hand with a helper, might only cost you a beer.
1966 250 Scrambler
1970 450 Jupiter

blaat!
Posts: 149
Joined: Thu Aug 25, 2011 4:31 pm
Location: Massachusetts

Re: Rear shock disassembly and/or rebuild?

Postby blaat! » Tue Oct 24, 2017 9:53 pm

Disassembled using a drill press and found items :D

rear-shox-1.jpg


Worked out well as the drill press has a lock which allowed me to leave it compressed while I worked on the collars and retaining balls.

I'm afraid the top one is too far gone to salvage, but y'all have talked me out of giving up so far. Continuing down the path...

rear-shox-2.jpg


Looks like I will need a 30mm box wrench and some heat to get this apart?

rear-shox-3.jpg


Not much purchase on the hex wrench surfaces. 50 years of crud holding them together. Might be the only thing holding them together :lol:

blaat!
Posts: 149
Joined: Thu Aug 25, 2011 4:31 pm
Location: Massachusetts

Re: Rear shock disassembly and/or rebuild?

Postby blaat! » Tue Oct 24, 2017 9:57 pm

Ah crap! Just realized the box wrench won't go over the fork eye :(

Ventodue
Posts: 474
Joined: Mon Mar 08, 2010 3:23 pm
Location: Montpellier, France

Re: Rear shock disassembly and/or rebuild?

Postby Ventodue » Wed Oct 25, 2017 7:59 am

blaat! wrote: Looks like I will need a 30mm box wrench and some heat to get this apart?


More like a LOT of REPEATED heat .. and easing oil ... and patience. The aluminum is as soft as butter, by the way. Fun, eh?! :?


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