Sports: RE: [DucatiST] Shiny New Clutch

Did I say that? J

I have a dial type torque wrench which I won in an auction which does small torque figures. Having said that I must admit that when I do a clutch I usually just snug it up.

Worst case of over torqueing resulting in disaster that I have experienced was in the 90s when I bought a Triumph TR7V8 for hillclimbing. The seller offered to put it through the MoT and it failed on play in a front hub. The grunt tightened it down hard and on the 35 mile drive home it seized. I drove the last 3 miles with the outer bearing race running on the inner with no balls in between, and the inner ended up welded to the stub axle. When I checked the hub nut should have been torqued to 7 lb ft and backed off a flat. An expensive mistake…

From: st2_owners@yahoogroups.com [mailto:st2_owners@yahoogroups.com] On Behalf Of Eddy
Sent: 26 February 2013 16:22
To: st2_owners@yahoogroups.com
Subject: Re: [DucatiST] Shiny New Clutch

Despite what it says in the copy of an earlier post further down the page here is a quote from the 2002 ST2 workshop manual:

"Clutch spring screws: M5 x 0.8 - 5 Nm (Tightening torque tolerance Nm ± 5%) - GREASE A"

Five Newton metres is a tiny tightening torque, around 2.9 ft/lbs. (See copy of post 108651 below.)

And just to throw another thought into the mix for all those worried ST owners. When you put a stainless component into close contact with an aluminium component the materials can be subject to galvanic corrosion as they are not close together on the galvanic chart. Lubrication becomes very important to stop the electrolytic action corroding them together. The standard clutch screw don't go rusty if you put the standard cover on.

Here is a snip from post # 108651, May 5, 2009.

---- Original Message ----
From: "Ian Ellison" <ian@...>
To: <st2_owners@yahoogroups.com>
Sent: Tuesday, May 05, 2009 3:37 PM
Subject: RE: [DucatiST] squeek!
Snip:
>> The only tricky bit is checking the torque when replacing the screws
>> - if
>> you have a torque wrench it's pretty easy but if not mechanically
>> inclined
>> you may not have one.
>>
>> HTH
>>
>> IanE

Wise words from Ian. I can't find a torque figure for these screws but
tightening the six pressure plate screws should be done using very light
pressure with the fingers on a very short allen key so that they are only just
nipped up. They screw into aluminium pillars that are part of the clutch
centre. If you are clumsy you could break off or strip one of these pillars.
This can lead to considerable swearing and a trip to the parts store to empty
your wallet. ;-)

Regards,

Eddy
(Ducati '03, ST4S, '48 Vincent Rapide)
(Hinckley, Leics., UK)

Regards,

Eddy
(Ducati '03, ST4S, '48 Vincent Rapide)
(Hinckley, Leics., UK)
===================================================================================================

From: goforthnconquer

Sent: Monday, February 25, 2013 3:52 PM

To: st2_owners@yahoogroups.com

Subject: [DucatiST] Shiny New Clutch

I just finished putting a new clutch in my 04 ST3 (dry clutch).

Surflex S1816 clutch pack
Charlie's ProCutting Basket
CNC Racing Pressure Plate.

The whole thing feels much more solid and smooth. Also I can hear the
engine at idle now, and not just the clutch :)

It went mostly well - I did break off a spring retainer bolt head
trying to use too big of a torque wrench. What do you all use for light
torque settings on the bike? I ended up just going with snug plus a
little with my hand on the head of a regular ratchet.

I was able to get replacements for the bolt at home depot, but I did buy
all six so that they would match (black coated vs shiny).

When Charlie sent me the basket, he also sent a new clutch holding tool
for the list that is now available. Let me know and it will be on it's
way to you.

-Richard Goforth